CURRICULUM VITAE (Last updated March 2013)
Hughes, Denis Arthur
Date of Birth
Marital Status
Nationality
:
:
:
06-12-51
Married with two children
British with South Africa permanent residence (since 1980)
QUALIFICATIONS
Academic
Other
:
:
:
BSc. Hons., Wales (1973); PhD, Wales (1978)
Registered as a Professional Natural Scientist with the South African Council for Natural
Scientific Professions (since 1984)
Rated as C1 by the South African National Research Foundation
MEMBERSHIP OF SCIENTIFIC SOCIETIES
Individual member of the International Association of Hydrological Sciences, Member of the British Hydrological
Society.
DETAILS OF UNIVERSITY EDUCATION
University College of Wales, Aberystwyth (1970 - 1973):
Single honours in Geography specialising in physical geography including geomorphology, hydrology, climatology,
surveying and photogrammetry. Other Subjects: Geology (1970 - 1971), Pure Mathematics with Statistics (1970 1972).
University College of Wales, Aberystwyth (1973 - 1976):
Natural Environment Research Council studentship to undertake research for a PhD degree under supervision of Dr J
Lewin on geomorphological and hydrological aspects of floodplains.
POSITIONS HELD
Research Assistant
U.C.W. Aberystwyth
Research Officer
Rhodes University, HRU
Senior Research Officer
Rhodes University, HRU
Associate Professor
Rhodes University, HRU/IWR
Professor
Rhodes University, IWR
Director of the Institute for Water Research (IWR)
1976 - 1979
1979 - 1983
1984 - 1988
1988 - 2002
2003 - Present
1991 – 1993, 1995 – 1997,
2004-date
DETAILS OF PRESENT POSITION
Full Professor in the Institute for Water Research, which was formed in July 1991 as an amalgamation of the former
Hydrological Research Unit and Institute for Freshwater Studies of Rhodes University, Grahamstown, South Africa.
Prof. Jay O'Keeffe of the former IFWS and myself provided the main motivation for this amalgamation and
formulated the terms, conditions and advantages of joining the two units. The Institutes normal staff complement
consists of approximately six research officers (at different levels), several junior research officers, technical and
administrative support, as well as post-graduate students. The IWR exists to carry out fundamental and applied
research (consultancy) for private and state agencies as well as to provide training to students in the fields of
Hydrology (surface and groundwater), Water Resources Management, Freshwater Ecology and Ecotoxicology. The
Institute attempts to combine the advantages of working in the areas of fundamental research, applications research
and practical problem solving, as well as teaching and training. A reasonable balance between these three objectives
is not always easy to achieve but the Institute considers that it is very important that our research activities are able to
be used in practice and can be communicated to future generations of scientists. The best way to ensure that this
happens is to be directly involved in all three. The Institute has both direct and loose associations with consulting
firms. As a senior staff member, I am jointly responsible for some of the day-to-day administration of the Institute
and sit on the Executive Committee of the Institutes Board of Control. The position of Director has revolved
between senior staff members and I held the first Directorship from 1991 to 1993. I have also had the primary
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responsibility for financial control within the Institute, even when not holding the Director’s position. I am the senior
scientist in the hydrology group of the Institute, which is mainly concerned with various projects (research and
application) in the field of computer based modelling of hydrological, eco-hydrological and water resource systems.
Up to July 2005 I was responsible for generating the funds required to cover both my salary and research support
costs. In July 2005 I was appointed to a permanent position of Professor in the IWR funded by Rhodes University.
This has allowed me to devote far more time to post-graduate student supervision, although I still undertake a
substantial amount of consultancy work. Some of the funds generated are used to support the post-graduate students.
OVERVIEW OF RESEARCH ACTIVITIES SINCE 1980
The central thread of my research since moving to South Africa and joining Rhodes University has been associated
with the development and application of different types of catchment rainfall-runoff and water resource models.
However, the direction of the research has changed over the years, partly as a reflection of international trends and
partly in response to the practical needs for water resources estimation tools within the southern Africa region.
1980 to early 1990’s: During this period the research activities were focussed on understanding hydrological
processes in semi-arid areas and incorporating that understanding into hydrological models. This was supported by
the operation of instrumented experimental catchments within the Eastern Cape area, which have now been
discontinued due to lack of funding support. During this period I also recognised the need for integrated modelling
systems that can be used to facilitate the application of a wide range of models through common data processing and
visualisation tools. This led to the development of the HYMAS (HYdrological Modelling Application System)
software package which became the main vehicle through which models and supporting data analysis procedures
were applied within the Institute for Water Research. The main advantage of the HYMAS package was that
additional models and data analysis procedures could be added easily, allowing the research hydrologist to
concentrate on the hydrology of the research problem and spend less time on the computer language coding.
1990’s to 2000: The value of the HYMAS software became apparent during the involvement of the IWR in the
UNESCO Southern African FRIEND (Flow Regimes from International Experimental and Network Data)
programme. The main contribution of the IWR was the assessment of monthly and daily hydrological models for
simulating the water resources of representative catchments in almost all of the SADC countries. The FRIEND
project led to a far greater involvement of the hydrology group of the IWR with other groups in southern Africa and
outside the region through cooperative research programmes funded by DFID (UK) and the EU. We have retained
many of these links up to the present day. The need to update HYMAS to a Windows environment and to incorporate
a spatial interface led to the development of the SPATSIM (Spatial and Time Series Information Modelling)
package, which remains the primary software platform used by IWR staff and students for running hydrological
models. It was during this period that I became involved in the hydrological issues associated with determining the
environmental water requirements of rivers, a subject that remains one of my main research areas. My involvement in
this subject arose from the amalgamation of the former Hydrological Research Unit and Institute of Freshwater
Studies to form the IWR as a multi-disciplinary institute that could combine the skills of different water scientists and
that would be able to more effectively contribute to a growing demand for expertise in the broad field of
environmental water management.
2000 to present day: During this period I have made a number of contributions to the science and practice of
determining the environmental water requirements of rivers through both research projects and participation in
consultancy projects. One of the results of this research (aided by two 1998 honours students) was to create a
computerised decision support system for a preliminary estimate (Desktop Estimate) of the quantity component of
the environmental reserve, based on a hydrological extrapolation of past IFR workshop results. Other countries of
southern Africa (and elsewhere) have also made use of this practical tool. More recently the IWR cooperated with
other groups (and a PhD student) to develop a revised version of the model that more explicitly incorporates the links
between hydrology, hydraulics and ecological response. All of the work on environmental water requirements has led
to a number of international publications. With respect to hydrological modelling, much of the research undertaken
since 2000 has been focused on the objectives of the International Association of Hydrological Sciences PUB
(Prediction in Ungauged Basins) programme, but in the context of the data sparse areas of southern Africa. One of
the issues that has confronted South African water resource managers for some time is the relationship between
surface and ground water hydrology in the fractured rock aquifer systems of the country and the lack of tools to
evaluate the relationships. At the same time, the country has made very successful use of the so-called Pitman model
for estimating surface water resource availability. During 2003 I developed a new ground water recharge and
discharge algorithm for the Pitman model (Hughes, 2004), which is still being tested and evaluated by some of the
IWR post-graduate students. The issue of accounting for uncertainty in hydrological and water resource estimates is
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of major international interest and the IWR has been involved in this area of research over the last 5 years,
cooperating with other groups internationally, but also locally in terms of the practical implementation of uncertainty.
In summary, the direction that my own research effort has followed over the last five years has remained in the field
of hydrological model development and application, although the emphasis has moved further towards the twin
objectives of achieving practical applications of models and ‘getting the right results for the right reasons’(scientific
understanding). It has led to productive associations with other groups involved in similar or related work, locally
and internationally and with other research groups as well as groups involved in practical applications. My
involvement with ecologists and the ecological Reserve programme has led to an enhanced appreciation of the value
of different types of hydrological data and the information requirements of different specialists working in the field
of water resources.
Over the 30+ years that I have been working in the HRU/IWR, I was a contract member of staff and was required to
generate all salary and research cost income through my own efforts. I have successfully negotiated the funding of
more than 8 major long-term research projects each worth between R300 000 and R1 800 000 in today’s value and
have contributed to several more. Between 2000 and 2004 I generated more than double my annual salary in
consultancy income providing much needed development income for the IWR.
CONSULTANCY EXPERIENCE
The majority of the consultancy work that has been undertaken relates to the practical application of the research
referred to above. I have been involved as the hydrological consultant to a number of IFR and Reserve assessments,
applying a variety of modelling techniques to generating daily flow scenarios (to represent virgin, present day or
future conditions) for use by other specialists in establishing the ecological Reserve for rivers. I have also been
involved in many smaller scale consultancy projects involving the application of rainfall-runoff models, design flood
models and reservoir water balance and design models. My consultancy experience extends to areas throughout
South Africa, as well as some of the neighbouring countries (Swaziland, Lesotho, Botswana, Zimbabwe and
Mozambique). Between 2000 and 2008 between 40 and 60% of my time was spent on consultancy projects. I
learned a great deal about the links between science and practice during that time. While I have continued to
participate in consulting projects, since about 2008 I have devoted far more time to post-graduate supervision than
consulting work.
PARTICIPATION IN WORKING GROUPS, ADVISORY BODIES AND NATIONAL
COMMITTEES
I have participated in several working groups of the Council for Scientific and Industrial Research, the Water
Research Commission (WRC) and the Dept. of Water Affairs and Forestry who have met to make recommendations
about a number of aspects related to hydrological research and water resource practice within South Africa. I am
also a member of several steering committees for WRC projects being undertaken at other centres.
In 1988 I was selected to be a committee member of the South African National Committee for the International
Association of Hydrological Sciences (SANCIAHS) and until 1999 was a co-opted member with responsibility for
education and training issues in hydrology. In September 1996, I was appointed to the SA Committee of the
International Hydrological Programme (IHP) by the Minister for Water Affairs and Forestry. In 2000 I was
appointed as the Chairman and National Representative of SANCIAHS whose task is to represent the committee on
the IAHS. In 2011 I retired as Chairman and National Representative to assume the responsibility of chairperson of
the Professional Advisory Committee to the South African National Council for Natural Scientific Professions
(SACNASP) for the Water Resources Science field of practice. During 2003 I was elected as a Vice President of the
IAHS International Commission on Surface Water. I was re-elected for a further 4 years during the IUGG conference
in Perugia, Italy in July 2007, but subsequently resigned this position to assume the role of Vice President of IAHS
with special responsibilities for developing countries. My position as Vice President of IAHS was confirmed during
the elections held at the Melbourne IUGG General Assembly and I will serve in this capacity until 2014. In 2007 I
was appointed as the regional representative of the Southern African FRIEND programme, a UNESCO IHP
initiative.
I have served on the editorial board of the Journal of Hydrology and Water SA and am currently an Associate Editor
for the journals, Hydrology Research, Hydrological Processes and the Hydrological Sciences Journal. I served on
the revision committee for the 6th edition of the WMO publication ‘Guide to Hydrological Practices’ and was
appointed in 2007 as a chapter facilitator for the UNESCO World Water Development Report. I am frequently
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requested to review submitted papers for a range of international journals including Journal of Hydrology, Water
Resources Research, Hydrological Sciences Journal, Hydrology and Earth Systems Science, and Water SA. I
currently review between 20 and 30 submitted journal papers every year. I have also acted as a reviewer and joint
editor for several international conference proceedings.
TEACHING AND SUPERVISORY EXPERIENCE
My main involvement with teaching in the past was with the Applied Hydrology and Water Resources Management
honours courses given in the Geography Department at Rhodes University. I coordinated the Applied Hydrology
course and gave many of the lectures since 1983. It was designed to cover the commonly used hydrological
estimation techniques and to introduce students to important advances in the field of applied surface water
hydrology. I currently contribute to an undergraduate (3rd year) course on water resources management run by the
Department of Environmental Sciences at Rhodes. Between 1987 and 2001 I was external examiner for the
undergraduate and postgraduate hydrology courses at the University of Zululand and am currently external examiner
for an honours course at the University of KwaZulu-Natal.
I have supervised a number of successful Masters and PhD students. I have also provided additional (specialist
hydrological) support to other staff acting as supervisors to other MSc/PhD students undertaking projects in related
disciplines. I have acted as external examiner for a number of Masters and PhD theses and have also contributed to
the supervision of PhD students from other universities.
During 2008, the IWR was successful in a bid for support from the Carnegie Rise Foundation of New York as part of
the Regional Initiative in Science Education (RISE). This allowed us to establish the Sub-Saharan Africa Water
Resources Network (SSAWRN), partnering with Makerere University (Uganda), Eduardo Mondlane University
(Mozambique) and the Okavango Research Institute (Botswana). I was appointed as the academic director of
SSAWRN and the main focus of the support is on postgraduate student bursaries. The initial funding was for 2009
and 2010 ($800 000) and the same level of funding was extended to December 2013. The IWR had 8 resident
postgraduates funded under this programme, some of which have already graduated.
I am currently supervising, 1 external MSc, 3 resident MSc, 2 external PhD and 2 resident PhD students.
Completed degrees supervised (or jointly supervised)
Frauenstein, G G (1987) An investigation of the sources and supply of coarse sediment input to a semi-arid channel
reach. MA Thesis.
Weaver, A van B (1988) An erosion hazard assessment technique for Ciskei. PhD Thesis.
Beater, A (1989) The applicability of two simple single event rainfall-runoff models to catchments with different
climate and physiography. MSc Thesis.
Wright, A H (1991) Artificial recharge of urban stormwater run-off in the Atlantis coastal aquifer. MSc Thesis
(awarded with distinction)
Watkins, D A (1993) The relationship between daily and monthly pan evaporation and rainfall totals in southern
Africa. MSc Thesis.
Murray, E C (1997) Guidelines for assessing single borehole yields in secondary aquifers. Msc Thesis awarded
with distinction.
Valimba, P (2005) Rainfall variability in southern Africa, its influences on streamflow variations and its
relationships to climatic variations. PhD Thesis.
Mwelwa, E M (2005) The application of the monthly time step Pitman rainfall-runoff model to the Kafue River
basin of Zambia. MSc Thesis awarded with distinction.
Hogan, K D (2007) Design flood peak determination in the rural catchments of the Eastern Cape, South Africa, Joint
Supervisor for MSc (Civil Eng.), University of Cape Town.
Kapangaziwiri, E (2008) Revised parameter estimation methods for the Pitman monthly rainfall-runoff model. MSc
Thesis awarded with distinction.
Sawunyama, T (2009) Evaluating uncertainty in water resources estimation in southern Africa: a case study of South
Africa. PhD Thesis.
Kapangaziwiri, E (2011) Regional application of the Pitman monthly rainfall-runoff model in southern Africa
incorporating uncertainty. PhD Thesis.
Mekiso, F (2011) Hydrological processes, chemical variability and multiple isotopes tracing of water flow paths in
the Kudumela wetland, Limpopo Province South Africa. MSc Thesis.
Slaughter, A R (2011) Modelling the relationship between flow and water quality in South African rivers. Joint
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Supervisor for PhD Thesis.
Desai, A Y (2012) Development of a hydraulic sub-model as part of a desktop environmental flow assessment
method. Joint Supervisor for PhD Thesis.
Tshimanga, R (2012) Hydrological uncertainty analysis and scenario based streamflow modelling for the Congo
River basin. PhD Thesis.
Tirivarombo, S (2013) Climate variability and climate change in water resources management of the Zambezi River
basin. PhD Thesis.
PARTICIPATION IN INTERNATIONAL CONFERENCES AND SYMPOSIA
I have attended and delivered papers at the following international scientific meetings.
Challenges in African Hydrology and Water Resources, Harare, Zimbabwe, July 1984 (Presentation and publication
in the proceedings).
4th International Hydrology Symposium on Multivariate Analysis of Hydrologic Processes, Colorado State
University, Colorado, July 1985 (Presentation and publication in the proceedings).
XIX General Assembly of the International Union of Geology and Geophysics, University of British Columbia,
Vancouver, Canada, 1987 (Presentation).
NATO Advanced Study Institute, Recent Advances in the Modelling of Hydrologic Systems, Sintra, Portugal, July
1988.
III General Assembly of the International Association of Hydrological Sciences at Baltimore, Maryland, USA in
May 1989 (Presentation).
XVI General Assembly of the European Geophysical Society, Wiesbaden, Germany in April 1991 (Presentation and
computer software demonstration).
International Conference on Integrated River Basin Development, Wallingford, UK in September, 1994
(Presentation and publication in the proceedings).
12th Journees Hydrologiques de L’Orstom, Regional Hydrology in Africa, Montpellier, France, October, 1996
(Presentation).
V General Assembly of the International Association of Hydrological Sciences at Rabat, Morocco in April 1997
(Presentation and publication in the proceedings).
Water Resources Variability in Africa during the XXth Century at Abidjan, Cote d’Ivoire, November 1998 (member
of the International Scientific Organising Committee and co-editor of the proceedings, presentation and
publication in the proceedings).
FRIEND 2002 – Regional Hydrology, 4th International Conference on FRIEND, Cape Town in March 2002
(Chairman of Local Organising Committee and co-editor of the proceedings, presentations and publications
in the proceedings).
MONTPELLIER 2003 - Hydrologie des régions méditerranéennes et semi-arides/Hydrology of the Mediterranean
and semi-arid regions (member of the International Scientific Organising Committee).
XXIII General Assembly of the International Union of Geology and Geophysics, Sapporo, Japan, July 2003. (verbal
presentation).
Hydrology, Science and Practice for the 21st Century. British Hydrological Society 2nd International Conference,
Imperial College London, July 2004 (Poster and verbal presentation).
G-WADI Workshop, UNESCO International workshop on modelling in semi-arid regions, Roorkee, India, March
2005 (Invited key speaker).
VIIth Scientific Assembly of the International Association of Hydrological Sciences at Foz do Iguacu, Brazil, April
2005 (Presentations).
FRIEND 2007 – Climate Variability and Change – Hydrological Impacts, Havana, Cuba, November 2006. (verbal
presentation and co-editor of the proceedings).
XXIV General Assembly of the International Union of Geology and Geophysics, Perugia, Italy, July 2007. (verbal
presentation).
10th British Hydrological Society Symposium, University of Exeter, Exeter, UK, September 2008 (verbal
presentation and paper in proceedings).
VIIth IAHS Scientific Assembly and 37th IAH Congress at Hyderabad, India, September 2009 (verbal presentations
and papers in the proceedings co-authored with post-graduate students).
Kovacs Colloquium: Hydrocomplexity: New Tools for Solving Wicked Water Problems. Paris, France, July 2010
(attendance only).
Role of Hydrology in Managing Consequences of a Changing Global Environment. British Hydrological Society 3rd
International Conference, Newcastle University, UK, July 2010 (Verbal presentation).
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FRIEND 2010 – 6th International FRIEND Conference: Global Change – Facing Risks and Threats to Water
Resources, Fez, Morocco, November 2010. (verbal presentation and 2 papers in the proceedings).
PUB in Practice, International Conference on PUB, Canmore, Canada, May 2011.
XXV General Assembly of the International Union of Geology and Geophysics, Melbourne, Australia, July 2011.
(verbal presentations and papers in proceedings).
11th British Hydrological Society Symposium, University of Dundee, Dundee, UK, July 2012 (verbal presentation
and paper in proceedings).
IAHS 90th Anniversary, PUB Symposium, Delft, Netherlands, October 2012 (verbal presentations).
OTHER INFORMATION
I was co-organiser of the 1987 Hydrological Sciences Symposium which combined the 4th Biennial Symposium of
the Groundwater Division of the Geological Society of South Africa and the 3rd National Hydrology Symposium of
the South African National Committee for the International Association of Hydrological Sciences (held at Rhodes
University, September 1987). I was also chairman of the local organising committee for the 7th South Africa
National Hydrology Symposium, held in Grahamstown during September 1995, as well as the 11 th Symposium held
in Port Elizabeth, 2003. I was Chairman of the local organising committee of the 4 th International conference on
FRIEND, held in Cape Town, March 2002 and have participated in the scientific advisory groups for several
international conferences.
I was awarded the Rhodes University Vice-Chancellors Senior Research Medal for 2012.
PUBLICATIONS AND REPORTS
Refereed Publications (Journals, refereed chapters in books and proceedings)
Based on PhD work at Aberystwyth Universit:
1. Lewin, J and Hughes, DA (1976) Assessing channel change on Welsh rivers. Cambria 3(1), 1-10.
2. Lewin, J, Hughes, DA and Blacknell, C (1977) Incidence of river erosion. Area 9 (3), 177-180.
3. Lewin, J, Collin, RL and Hughes, DA (1979) Floods on modified floodplains. In: G E Hollis (ed). Man's
impact on the hydrological cycle in the United Kingdom. Geo Abstracts, 109-119.
4. Lewin, J and Hughes, DA (1980) Welsh Floodplain Studies II. Application of a qualitative inundation model. J.
Hydrol. 46, 35-49.
5. Hughes, DA (1980) Floodplain inundation: processes and relationships with channel discharge. Earth Surface
Processes. 5, 297-304.
6. Hughes, DA (1981) An approach to the quantification of floodplain form. Area, 13 (4), 285-292
7. Hughes, DA and Lewin J (1982) A small scale floodplain. Sedimentol 29, 891-895.
Based on Rhodes University research (1980 to 1989):
8. Görgens, AHM and Hughes, DA (1982) Synthesis of streamflow information relating to the semi-arid Karoo
Biome of South Africa. S. Afr. J. of Science, 78, 58-68.
9. Hughes, DA (1982) The relationship between mean annual rainfall and physiographic variables applied to a
coastal region of South Africa. S A Geog. Journ. 64 (1), 41-50.
10. Hughes, DA (1984) An isolated event model based on direct runoff calculations using an implicit source area
concept. Hydrol. Sci. Journ., 29 (3), 311-325.
11. Hughes, DA and Guthrie, BK (1984) The Continuous monitoring of rainfall: A technical discussion. Water S A
10(2), 75-80.
12. Hughes, DA (1985) Conceptual catchment model parameter transfer investigations in the Southern Cape. Water
S A 11(3), 149-156.
13. Hughes, DA and Moolman JH (1987) Soluble salt content of the alluvial banks of an ephemeral stream in a semiarid catchment. Water S A 13(2), 81-86.
14. Hughes, DA and Wright, A (1988) Spatial variability of short term rainfall amounts in a coastal mountain region
of Southern Africa. Water S A, 14 (3), 131-138.
15. Hughes, DA (1989) Estimation of the parameters of an isolated event conceptual model from physical catchment
indices. Hydrol. Sci. Journ. 34(5), 539-557.
16. Hughes, DA and Beater, AB (1989) The applicability of two single event models to catchments with different
physical characteristics. Hydrol. Sci. Journ. 34(1), 63-78.
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Based on Rhodes University research (1990 to 1990):
17. Hughes, DA and Sami, K (1992) Transmission losses to alluvium and associated moisture dynamics in a semiarid ephemeral channel system in southern Africa. Hydrological Processes, 6, 45-53.
18. Hughes, DA (1992) A Monthly time step, multiple reservoir water balance simulation model. Water SA, 18(4),
279-286.
19. Hughes, DA (1993) Variable time intervals in deterministic models. J. Hydrol., 143, 217-232.
20. Hughes, DA (1994) Soil moisture and Runoff Simulations using four catchment rainfall-runoff models. J.
Hydrol., 158, 381-404.
21. Hughes, DA and Sami, K (1994) A semi-distributed, variable time interval model of catchment hydrology structure and parameter estimation procedures. J. Hydrol., 155, 265-291.
22. Hughes, DA and van Ginkel, C (1994) Nutrient Loads from Developing Urban Areas, a Simulation Approach
and Identification of Information Requirements. Water SA, 20(2), 139-150.
23. Hughes, DA (1995) Monthly rainfall-runoff models applied to arid and semiarid catchments for water resource
estimation purposes. Hydrol. Sci. Journ., 40(6), 751-769.
24. Smakhtin, VY, Watkins, DA and Hughes, DA (1995) Preliminary Analysis of low-flow characteristics of South
African Rivers. Water SA, 21(3), 201-210.
25. Hughes, DA (1996) Groot River Basin, Eastern Cape Province, Republic of South Africa. In: Water Resource
Management and Desertification: Problems and Challenges, WMO, Geneva, Switzerland. 169-180.
26. Hughes, DA and Smakhtin V (1996) Daily flow data time series patching or extension, a spatial interpolation
approach based on flow duration curves. Hydrol. Sci. Journ., 41(6), 851-871.
27. Sami, K and Hughes, DA (1996) A comparison of recharge estimates to a fractured sedimentary aquifer in South
Africa from a chloride mass balance and an integrated surface-subsurface model. J. Hydrol., 179, 111-136.
28. Hughes, DA, O’Keeffe, J, Smakhtin, V and King, J (1997) Development of an operating rule model to simulate
time series of reservoir releases for instream flow requirements. Water SA, 23(1), 21-30.
29. Hughes, DA, O’Keeffe, J and King, J (1997) Development of a reservoir release operating rule model to
simulate demands for instream flow requirements and water resources. In: Sustainability of Water
Resources under Increasing Uncertainty (Eds. D Rosbjerg, N-E Boutayeb, A Gustard, Z Kundzewicz &
P Rasmussen), IAHS Publ. 240, 321-329.
30. Bullock, A, Andrews, AJ, Mkhandi, S, Mngodo, R and Hughes, DA (1997) Southern African FRIEND international collaboration in the hydrological science of flow regimes. In: Sustainability of Water
Resources under Increasing Uncertainty (Eds. D Rosbjerg, N-E Boutayeb, A Gustard, Z Kundzewicz &
P Rasmussen), IAHS Publ. 240, 133-143.
31. Smakhtin, VY, Creuse-Naudin, E and Hughes, DA (1997) Regionalization of daily flow characteristics in part of
the Eastern Cape, South Africa. Hydrol. Sci. Journ., 42(6), 919-936.
32. Hughes, DA (1997) Rainfall-Runoff Modelling. In: Southern African FRIEND, IHP-V, Technical Documents
in Hydrology, No. 15, UNESCO, Paris. 94-129.
33. Hughes, DA and Metzler, W (1998) Assessment of three monthly rainfall-runoff models for estimating the water
resource yield of semi-arid catchments in Namibia. Hydrol. Sci. Journ., 43(2), 283-297.
34. Hughes, DA and Ziervogel, G (1998) The inclusion of operating rules in a daily reservoir simulation model to
determine ecological reserve releases for river maintenance. Water SA. , 24(4), 293-302.
35. Hughes, DA (1998) Antecedent precipitation, Arid zone hydrology, Computer Models and Data processing in
hydrology - contributions to R W Herschy & R W Fairbridge (Eds), Encyclopedia of Hydrology and
Water Resources. Kluwer Academic.
36. Hughes, DA & Smakhtin, V (1998) Simulating the impacts of land-use change on streamflow time series for
southern African rivers. In: Water Resources Variability in Africa during the XXth Century (Eds. E
Servat, D Hughes, J-M Fritsch & M Hulme), IAHS Publ. 252, 419-428.
37. Smakhtin, VY, Hughes, DA & Smakhtina, O (1998) Generating natural daily flow sequences for South African
rivers from historical flow data. In: Water Resources Variability in Africa during the XXth Century
(Eds. E Servat, D Hughes, J-M Fritsch & M Hulme), IAHS Publ. 252, 419-428.
38. Smakhtin, VY., Sami, K., Hughes, DA. (1998) Evaluating the performance of a deterministic daily rainfallrunoff model in a low-flow context. Hydrol. Proccesses , 12, 797-811.
39. Smakhtin, VY, Watkins, DA, Hughes, DA, Sami, K & Smakhtina, OY (1998) Methods of catchment-wide
assessment of daily low-flow regimes in South Africa. Water SA, 24(3), 173-185.
40. Hughes, DA (1999) Towards the incorporation of magnitude-frequency concepts into the Building Block
Methodology used for quantifying ecological flow requirements of South African rivers. Water SA., 25(3),
279-284.
Based on Rhodes University research (2000 to 2009):
41. Louw, D, Hughes, DA & Birkhead, A (2000) The IFR process: beyond the specialist workshop. African Journ.
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Of Aquatic Science, 25, 183-190
42. Hughes, DA (2001) Providing Hydrological Information and Data Analysis Tools for the Determination of the
Ecological Instream Flow Requirements for South African Rivers. Journ. Hydrol. , 241 (1-2), 140-151.
43. Wilk, J and Hughes, DA (2002a) Calibrating a rainfall-runoff model for a catchment with limited data. Hydrol.
Sci. Journ., 47(1), 3-17.
44. Wilk, J and Hughes, DA (2002b) Simulating the impacts of land-use and climate change on water resource
availability for a large south Indian catchment. Hydrol. Sci. Journ., 47(1), 19-30.
45. Hughes, DA, Görgens, A, Middleton, B & Hollingworth, B (2002) Regional water resource assessments in the
SADC region. Proc. of the 4th International Conference on FRIEND. IAHS Publ. No. 274, 11-18.
46. Hughes, DA (2002) The development of an information modelling system for regional water resource
assessments. Proc. of the 4th International Conference on FRIEND. IAHS Publ. No. 274, 43-49.
47. Hughes, DA (2002) Issues in Contemporary Geographical Hydrology. S A Geog. Journ. 84 (1), 139-144.
48. O’Keeffe, J, Hughes, DA & Tharme, R (2002) Linking ecological responses to altered flows, for use in
environmental flow assessments: the Flow Stressor-Response method. Verh. Internat. Verein. Limnol.,
28, 84-92.
49. Hughes, DA & Hannart, P (2003) A desktop model used to provide an initial estimate of the ecological instream
flow requirements of rivers in South Africa. Journ. Hydrol., 270(3-4), 167-181.
50. Hughes, DA, Hannart, P & Watkins, D (2003) Continuous baseflow separation from time series of daily and
monthly streamflow data. Water SA, 29(1), 43-48
51. Hughes, DA (2003) Environmental flow requirements in water resource planning and operation. Water
Resources Systems—Hydrological risk, management and development (Proceedings of symposium HS02b
held during IUGG2003 at Sapporo, July 2003). IAHS Publ. no. 281, 261-268.
52. Andersson, L, Gumbricht, T, Hughes, D, Kniveton, D, Ringrose, S, Savenjie, H, Todd, M, Wolk, J & Wolski, P
(2003) Water Flow Dynamics in the Okavango River Basin and Delta – a prerequisite for the Ecosystems of
the Delta. Physics and Chemistry of the Earth, 28, 1165-1172.
53. Hughes, DA, Ashton, P, Görgens, A, Jewitt, G, Schulze, R, Smithers, J, Pegram, G and Dube, R. (2003) South
African research in the hydrological sciences: 1999-2002. South African Journal of Science, 99, 394-397.
54. Hughes, DA (2004) Incorporating ground water recharge and discharge functions into an existing monthly
rainfall-runoff model. Hydrol. Sci. Journ. 49(2), 297-311.
55. Hughes, DA (2004) Problems of estimating hydrological characteristics for small catchments based on
information from the South African national surface water resource database. Water SA, 30(3), 393-398.
56. Hughes, DA (2004) Three decades of hydrological modeling research in South Africa. Special Rhodes
University Centenary Edition of the South African Journal of Science, 100, 638-642.
57. Hughes, DA (2005) Hydrological issues associated with the determination of environmental water requirements
of ephemeral rivers. River Research and Applications, 21(8), 899-908.
58. Valimba, P, Mkhandi, SH, Servat, E & Hughes, D (2005) Changing flows in Southern Africa and its relationship
to rainfall variations. International symposium on Climatic and Anthropogenic Impacts on the Variability of
the Water Resources. Montpellier, France, November 2005.
59. Hughes, DA (2006) Water resources estimation in less developed regions – issues of uncertainty associated with
a lack of data. Prediction in Ungauged Basins: Promises and Progress (Proceedings of symposium S7
held during the Seventh IAHS Scientific Assembly at Foz do Iguaçu, Brazil, April 2005). IAHS Publ. 303,
72-79.
60. Hughes, DA, Andersson, L, Wilk, J and Savenije, HHG (2006) Regional calibration of the Pitman model for the
Okavango River. Journ. Hydrology, 331, 30-42.
61. Andersson, L, Wilk, J, Todd, MC, Hughes, DA, Earle, A, Kniveton, D, Layberry, R and Savenije, HHG (2006)
Impact of climate change and development scenarios on flow patterns in the Okavango River. Journ.
Hydrology, 331, 43-57.
62. Wilk, J, Kniveton, D, Andersson, L, Layberry, R, Todd, MC, Hughes, D, Ringrose, S and Vanderpost, C (2006)
Estimating rainfall and water balance over the Okavango River basin for hydrological applications. Journ.
Hydrology, 331, 18-29.
63. Hughes, DA (2006) Comparison of satellite rainfall data with observations from gauging station networks.
Journ. Hydrology, 327(3-4), 399-410.
64. Hughes, DA & Forsyth, DA (2006) A generic database and spatial interface for the application of hydrological
and water resource models. Computers and Geosciences, 32, 1389-1402.
65. Smakhtin, VU, Shilpakar, RL & Hughes, DA (2006) Hydrology-based assessment of environmental flows: An
example from Nepal. Hydrological Sciences Journal, 51(2), 207-222.
66. Hughes, DA (2006) A simple model for assessing utilizable streamflow allocations in the context of the
ecological Reserve. Water SA, 32(3), 411-417.
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67. Hughes DA (2006) An evaluation of the potential use of satellite rainfall data for input to water resource
estimation models in southern Africa. Climate Variability and Change – Hydrological Impacts
(Proceedings of the Fifth FRIEND World Conference held at Havana, Cuba, November 2006), IAHS Publ.
308, 75-80.
68. Hughes, DA (2006) Modelling semi-arid and arid hydrology and water resources – the southern African
experience. Ch. 3 in Hydrological Modeling in Arid and Semi-Arid Areas. Cambridge Univ. Press.
69. Valimba, P, Camberlin P, Richard Y, Servat E and Hughes DA (2006) Influences of ENSO and SST variations
on the interannual variability of rainfall amounts in southern Africa. Climate Variability and Change –
Hydrological Impacts (Proceedings of the Fifth FRIEND World Conference held at Havana, Cuba,
November 2006), IAHS Pub. 308, 362-368.
70. Smakhtin, VU & Hughes, DA (2007) Automated estimation and analyses of meteorological drought
characteristics from monthly rainfall data. Environmental Modelling and Software, 22(6), 880-890.
71. Hughes, D & Kapangziwiri, E (2007) The use of physical basin properties and runoff generation concepts as an
aid to parameter quantification in conceptual type rainfall-runoff models. Quantification and Reduction
of Predictive Uncertainty for Sustainable Water Resource Management (Proceedings of Symposium
HS2004 at IUGG2007, Perugia, July 2007). IAHS Publ. 313, 311-318.
72. Sawunyama, T & Hughes, D (2007) Assessment of rainfall-runoff model input uncertainties on simulated runoff
in southern Africa. Quantification and Reduction of Predictive Uncertainty for Sustainable Water
Resource Management (Proceedings of Symposium HS2004 at IUGG2007, Perugia, July 2007). IAHS
Publ. 313, 98-106.
73. Hughes, DA (2007) South African research in the hydrological sciences: 2003-2006. South African Journal of
Science, 103, (9/10), 415-418.
74. Hughes, DA and Mallory SJL (2008) Including environmental flow requirements as part of real-time water
resource management. River Research and Applications, 24(6), 852-861.
75. Sawunyama, T and Hughes, DA (2008) Application of satellite-derived rainfall estimates to extend water
resource simulation modelling in South Africa. Water SA, 34(1), 1-9.
76. Kapangaziwiri, E and Hughes, D A (2008) Revised physically-based parameter estimation methods for the
Pitman monthly rainfall-runoff model. Water SA, 32(2), 183-191.
77. Todd, MC, Andersson, L, Hughes, DA, Kniveton, D, Layberry, R, Murray-Hudson, M, Savenije, HHG, Wilk, J
and Wolski, P (2008) Simulating climate change impacts on water resources: Experience from the
Okavango River, southern Africa. In: Sorooshian et al. Hydrological Modelling and the Water Cycle:
Coupling Atmospheric and Hydrological Models, Springer, 243-266.
78. Rivers-Moore, NA, Hughes, DA & de Moor, FC (2008) A model to predict outbreak periods of the pest blackfly
Simulium Chutteri Lewis (Simuliidae Diptera) in the Great Fish River, Eastern Cape Province, South
Africa. River Research and Applications, 24, 132-147.
79. Rivers-Moore, NA, Hughes, DA, Mantel S, & Hill, TR (2008) First steps in the development of a water
temperature model framework for refining the ecological Reserve in South African rivers. Water SA,
34(5), 585-595.
80. WMO (2008) Manual on Low-flow Estimation and Prediction. Contributions to chapters 9 (Estimating low flows
at ungauged sites) and 12 (Case Studies). World Meteorological Organization. Operational Hydrology
Report No. 50. Geneva, Switzerland.
81. Hughes, DA (2009) Simulating the hydrology and total dissolved solids (TDS) of ephemeral rivers in South
Africa for environmental water requirement determinations. River Research and Applications, 25(7),
850-860.
82. Sawunyama, T and Hughes, DA (2009) Rainfall variability and uncertainty in water resource assessments in
South Africa. New approaches to hydrological prediction in data sparse regions (Proc. symposium HS2 at
the joint IAHS & IAH convention, Hyderabad, India, Sept. 2009). IAHS Publ. 333, 287-293.
83. Kapangaziwiri, E, Hughes DA, and Wagener, T (2009) Towards the development of a consistent uncertainty
framework for hydrological predictions in South Africa. New approaches to hydrological prediction in data
sparse regions (Proc. symposium HS2 at the joint IAHS & IAH convention, Hyderabad, India, Sept.
2009). IAHS Publ. 333, 84-93.
84. Hughes, DA and Mallory, SJL (2009) The importance of operating rules and assessments of beneficial use in
water resource allocation policy and management. Water Policy, 11, 731-741.
Based on Rhodes University research (2010 to Present):
85. Hughes, DA, Kapangaziwiri, E and Baker, K (2010) Initial evaluation of a simple coupled surface and ground
water hydrological model to assess sustainable ground water abstractions at the regional scale. Hydrology
Research, 41(1), 1-12.
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86. Hughes, DA (2010) Unsaturated zone fracture flow contributions to stream flow: evidence for the process in
South Africa and its importance. Hydrological Processes, 24, 767-774.
87. Hughes, DA and Mantel, SK (2010) Estimating the uncertainty in the impacts of small farm dams on stream flow
regimes in South Africa. Hydrological Sciences Journal, 55(4), 578-592.
88. Mantel, SK, Hughes, DA and Muller, NWJ (2010) Ecological impacts of small dams on South African rivers:
Part I. Drivers of change – water quantity and quality. Water SA, 36(3), 351-360.
89. Mantel, SK, Muller, NWJ and Hughes, DA (2010) Ecological impacts of small dams on South African rivers:
Part II. Biotic response – abundance and composition of macroinvertebrate communities. Water SA,
36(3), 361-370.
90. Hughes, DA, Kapangaziwiri, E and Sawunyama, T (2010) Hydrological model uncertainty assessment in
southern Africa. Journ. Hydrology, 387, 221-232.
91. Hughes, DA and Louw, D (2010) Integrating hydrology, hydraulics and ecological response into a flexible
approach to the determination of environmental water requirements for rivers. Environ. Model. &
Software, 25(8), 910-918. [Awarded the best paper of 2010 for this journal]
92. Sawunyama, T and Hughes, DA (2010) Using satellite-based rainfall data to support the implementation of
environmental water requirements in South Africa. Water SA 36(4), 379-385.
93. Hughes, DA and Mantel, S (2010) Estimating uncertainties in simulations of natural and modified streamflow
regimes in South Africa. Global Change – Facing Risks and Threats to Water Resources (Proceedings
of the Sixth FRIEND World Conference held in Fez, Morocco, November 2010), IAHS Publ. 340, 358364.
94. Hughes, DA, Tshimanga, R and Tirivarombo, S (2010) Simulating the hydrology and water resources of large
basins in southern Africa. Global Change – Facing Risks and Threats to Water Resources (Proceedings
of the Sixth FRIEND World Conference held in Fez, Morocco, November 2010), IAHS Publ. 340, 591597.
95. Hughes, DA (2010) Hydrological models: mathematics or science? Hydrological Processes, 24, 2199-2201.
96. Hughes, DA, Kingston, DG and Todd, M.C. (2011) Uncertainty in water resources availability in the Okavango
River Basin as a result of climate change. Hydrol. Earth Syst. Sci. , 15, 931-941.
97. Hughes, DA (2011) Regionalisation of models for operational purposes in developing countries: An
introduction. Hydrology Research 42(5), 331-337.
98. Tshimanga, R, Hughes, DA and Kapangzawiri, E (2011) Understanding hydrological processes and estimating
model parameter values in large basins: The case of the Congo River basin. Conceptual and modelling
studies of integrated groundwater, surface water and ecological systems (Proceedings of Symposium
H01, IUGG Conference held in Melbourne, Australia, July 2011), IAHS Publ. 345, 17-22.
99. Kapangzawiri, E, Hughes, DA, Tanner, J and Slaughter, S (2011) Resolving uncertainties in the source of low
flows in South African rivers using conceptual and modelling studies. Conceptual and modelling studies
of integrated groundwater, surface water and ecological systems (Proceedings of Symposium H01,
IUGG Conference held in Melbourne, Australia, July 2011), IAHS Publ. 345, 127-132.
100. Hughes, DA, Mallory, SJL, Haasbroek, B and Pegram, GGS (2011) Hydrological and Stochastic Uncertainty:
Linking Hydrological and Water Resources Yield Models in an Uncertainty Framework. Risk in water
resources management. (Proceedings of Symposium H03, IUGG Conference held in Melbourne,
Australia, July 2011), IAHS Publ. 347, 127-132.
101. Sawunyama, T, Hughes, DA and Mallory, SJL (2011) Evaluation of combined contribution of uncertainty
sources to total output uncertainty in water resource estimation in South Africa. . Risk in water resources
management. (Proceedings of Symposium H03, IUGG Conference held in Melbourne, Australia, July
2011), IAHS Publ. 347, 133-138.
102. Tiravarombo, S and Hughes, DA (2011) Regional droughts and food security relationships in the Zambezi
River basin. Physics and Chemistry of the Earth (Accepted), doi: 10.1016/j.pce.2011.08.003
103. Tshimanga, R, Hughes, DA and Kapangzawiri, E (2011) Initial calibration of a semi-distributed rainfall runoff
model for the Congo River basin. Understanding hydrological processes and estimating model parameter
values in large basins: Physics and Chemistry of the Earth 36(14-15), 761-774
104. Hughes, D.A. (2012) Hydrological education and training needs in sub-Saharan Africa: requirements,
constraints and progress. Hydrol. Earth Syst. Sci. 16, 861-871.
105. Kapangaziwiri, E, Hughes, D.A. and Wagener, T. (2012) Constraining uncertainty in hydrological predictions
for ungauged basins in southern Africa. Hydrol. Sci. Journ. 57(5), 1000-1019.
106. Hughes, DA, Corral, E and Muller, WJ (2012) Potential for the application of General Purpose Water
Accounting in South Africa. In: J.M. Godfrey and K. Chalmers (Eds), Water Accounting: International
Approaches to Policy and Decision-making. Edward Elgar, Cheltenham, UK.
107. Hughes, D.A. and Mohobane, T. (2012) Reducing uncertainty in hydrological models using local observed
data: examples from South Africa. Proc. 11th National Symposium, British Hydrological Society. doi:
DA Hughes – General CV
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108. Tshimanga, R.M. and Hughes, D.A. (2012) Climate change and impacts on the hydrology of the Congo Basin:
The case of the northern sub-basins of the Oubangui and Sangha Rivers. Physics and Chemistry of the
Earth 50-52, 72-83.
109. Hughes, D.A., Kapangaziwiri, E. and Tanner, J. (2013) Spatial scale effects on model parameter estimation and
predictive uncertainty in ungauged basins. Hydrology Research (Accepted).
110. Slaughter, A and Hughes, D.A. (2013) A simple model to separately simulate point and diffuse nutrient
signatures in stream flows. Hydrology Research (Accepted).
111. Linhoss, A.C, Munoz-Carpena, R., Kiker, G. and Hughes D. (2013) Hydrologic modeling, uncertainty, and
sensitivity in the Okavango Basin: Insights for scenario assessment. J. Hydrologic Eng. (Accepted).
112. Hughes, DA, Tshimanga, R, Tirivarombo, S. and Tanner, J. (2013) Simulating wetland impacts on stream flow
in southern Africa using a monthly hydrological model. Hydrological Processes, doi 10.1002/hyp.9725.
113. Hughes, D.A., Gush, M., Tanner, J. and Dye, P. (2013) Using targeted short-term field investigations to
calibrate and evaluate the structure of a hydrological model. Hydrological Processes (Accepted Feb 2013).
114. Hughes, D.A., Mantel, S and Mohobane, T. (2013) An assessment of the skill of downscaled GCM outputs in
simulating historical patterns of rainfall variability. Hydrology Research (Accepted Feb 2013).
Papers in preparation or under review:
115. Slaughter, A and Hughes, D.A. (2012) Extending a mechanistic mass-balance salinity model to account for the
effect of saline agricultural return flow. Environmental Modelling and Software (submitted March 2012).
116. Hughes, D.A., Desai, A.Y., Birkhead, A.L. and Louw, D. (2012) A new approach to rapid, desktop level,
environmental flow assessments for rivers in southern Africa. Hydrological Sciences Journal (Submitted to
Special Edition August 2012).
117. Műnch, Z, Conrad, J.E., Gibson, L.A., Palmer, A.R., Hughes, D.A. (2012) Satellite earth observation as a tool
to conceptualize hydrogeological fluxes in the Sandveld, South Africa. Hydrogeology Journal (Submitted
Sept. 2012).
118. Hrachowitz, M., Savenije, H.H.G., Blöschl, G., McDonnell, J.J., Sivapalan, M., Pomeroy, J.W., Arheimer, B.,
Blume, T., Clark, M.P., Ehret, U., Fenicia, F., Freer, J.E., Gelfan, A., Gupta, H.V., Hughes, D.A., Hut, R.W.,
Montanari, A., Pande, S., Tetzlaff, D., Uhlenbrook, S., Wagener, T., Winsemius, H.C. and Woods, R.A.
(2013) A decade of Predictions in Ungauged Basins (PUB) - a review. Hydrological Sciences Journal (in
preparation).
119. McIntyre, N., Ballard, C., Bruen, M., Bulygina, N., Buytaert, W., Cluckie, I., Dunn, S., Ehret, U., Ewen, J.,
Gelfan, A., Hess, T., Hughes, D.A., Jackson, B., Kjeldsen, T., Merz, R., Park, J-S., O’Connell, E., O’Donnell,
G., Oudin, L., Todini, E., Wagener, T. and Wheater, H. (2013) Modelling the hydrological impacts of land
use change. Hydrology Research (Submitted Feb 2013).
120. Montanari, A., G. Young, H. Savenije, D. A. Hughes, T. Wagener, L Ren, D. Koutsoyiannis, C. Cudennec, S.
Grimaldi, G. Bloeschl, M. Sivapalan, K. Beven, H. Gupta, B. Arheimer, Y. Huang, A. Schumann, D. Post, V.
Srinivasan, E. Boegh, P. Hubert, C. Harman, S. Thompson, M. Rogger, M. Hipsey, E. Toth, A. Viglione, G.
Di Baldassarre, B. Schaefli, H. McMillan, S.J. Schymanski, G. Characklis, B. Yu, Z. Pang and V. Belyaev
(2013) “Panta Rhei – Everything Flows”: Change in hydrology and society – The IAHS Scientific Decade
2013-2022. Hydrological Sciences Journal (in preparation).
Refereed Reports (Through Project Steering Committees or independent reviewers)
1. Hughes, DA and Görgens, AHM (1981) Hydrological investigations in the Southern Cape Coastal Lakes
Region. Hydrological Research Unit, Report 1/81 Rhodes University, Grahamstown. 76 pp.
2. Hughes, DA and Görgens AHM (1982) Hydrology of the Buffalo River Catchment. In: R C Hart (Ed). Water
Quality in the Buffalo River catchment. A synthesis. Institute for Freshwater Studies, Rhodes
University, Grahamstown, 37-62.
3. Hughes, DA (1982) Conceptual catchment and model parameter transfer studies using monthly data from
the Southern Cape Coastal Lake region. Hydrological Research Unit, Report 1/82, Rhodes University,
Grahamstown, 124 pp.
4. Hughes, DA (1983) Preliminary investigations into isolated flood event modelling with specific reference to
the Southern Cape Coastal Lakes region. Hydrological Research Unit, Report 3/83, Rhodes University,
Grahamstown 47 pp.
DA Hughes – General CV
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5. Görgens, AHM and Hughes, DA (1986) Hydrology. In R M Cowling, P W Roux and A J H Pieterse (eds) The
Karoo Biome: Part 1 - Physical Environment. South African National Scientific Programmes Report
No. 124, 53-83.
6. Hughes, DA and Beater, AB (1987) An assessment of isolated flood event conceptual models in different
climatic and physiographic areas - the models and the initial results. WRC Report 138/1/87 and
Hydrological Research Unit, Department of Geography, Rhodes University, Grahamstown, South Africa.
7. Hughes, DA and Beater, AB (1989) The application of isolated even conceptual models to simulating floods
in areas with different climate and physiographic characteristics. WRC Report 138/2/89 and
Hydrological Research Unit, Department of Geography, Rhodes University, Grahamstown, South Africa.
8. Hughes DA and Sami, K (1993) The Bedford Catchments. An Introduction to their Physical and
Hydrological Characteristics. WRC Report 138/1/93 and Institute for Water Research Report 1/93,
Rhodes University, Grahamstown, South Africa.
9. Hughes DA, Sami, K and Murdoch, KA (1993) Hydrological Models - Development and Application. WRC
Report 138/2/93 and Institute for Water Research Report 2/93, Rhodes University, Grahamstown, South
Africa.
10. Hughes, DA (1997) Southern African FRIEND - The application of rainfall-runoff models in the SADC
region. Water Research Commission, Report No. 235/1/97, Pretoria.
11. Hughes, DA, Forsyth, D & Watkins, DA (2000) An integrated software package for the analysis and display
of hydrological or water resources time series data. Water Research Commission Report No. 867/2/00.
12. Hughes, DA & Munster, F (2000) Hydrological information and techniques to support the determination of
the water quantity component of the Ecological Reserve for rivers. Water Research Commission
Report No. TT 137/00.
13. Hughes, DA, Mwelwa, E, Andersson, L & Wilk, J (2003) Regional Water Resources and River Flow Modelling.
In: J Meigh & M Fry (Eds), Southern African FRIEND Phase II 2000-2003, Centre for Ecology and
Hydrology, Wallingford, UK.
14. Hughes, DA (Ed) (2004) SPATSIM, an integrating framework for ecological Reserve determination and
implementation. Water Research Commission Report No. TT 245/04.
15. Smakhtin, VU and Hughes, DA (2004) Review, Automated Estimation and Analyses of Drought Indices in
South Asia. International Water Management Institute (IWMI), Working Paper 83, Colombo, Sri Lanka.
16. Hughes, DA, Parsons, R and Conrad, J (2007) Quantification of the groundwater contribution to baseflow.
Water Research Commission Report No. 1498/1/07.
17. Hughes, DA (2008) Hydrological information requirements and methods to support the determination of
environmental water requirements in ephemeral rivers. Water Research Commission Report No. KV
205/08.
18. Hughes, DA, Mallory, SJL and Louw, D (2008) Methods and software for the real-time implementation of
the ecological Reserve – explanations and user manual. Water Research Commission Report No.
1582/1/08.
19. Rivers-Moore, NA, Hughes, DA and Mantel, S (2008) Links between water temperatures, ecological
responses and flow rates: A framework for establishing water temperature guidelines for the
ecological Reserve. Water Research Commission Report No. KV 214/08.
20. Haigh, EH, Fox, H, Davies-Coleman, H, Hughes, D, Atkinson, D and McCann, M. (2008) The role of local
government in integrated water resources management linked to water services delivery. Water
Research Commission Report No. 1688/1/08.
21. Hughes, DA, Kapangaziwiri, E, Mallory, SJL, Wagener, T and Smithers, J (2011) Incorporating uncertainty in
water resources simulation assessment tools in South Africa. Water Research Commission Report No.
1838/1/11.
22. Seaman, MT, Avenant, MF, Watson, M, King, J, Armour, J, Barker, CH, Dollar, E, du Preez, PJ, Hughes, D,
Rossouw, L and van Tonder, G. (2010) Developing a method for determining the environmental water
requirements for non-perennial systems. Water Research Commission Report No. TT 459/10.
Published Conference, Symposia and Scientific Workshop Proceedings (not refereed)
In recent years many of these have been ‘published’ in electronic format as CD copies of the proceedings of the
meetings.
1. Weaver, A van B and Hughes, DA (1984) Continuous monitoring of rainfall, streamflow and suspended sediment
concentration in semiarid environments. Challenges in African Hydrology and Water Resources, Proc.
DA Hughes – General CV
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Harare Symposium, July 1984, IAHS Publ. No. 144, 363-371.
2. Herald, J, Hughes, DA and Schultz, CB (1986) Hydrometeorological instrumentation requirements for catchment
based hydrological research in G Held and K E Estie (eds) Proceedings and recommendations of the
Symposium on automatic weather stations and data logging systems, Nov 1986, Weather Bureau, Dept
of Environment Affairs, Pretoria. 162-177.
3. Hughes, DA (1986) Analysis of extreme rainfalls and antecedent catchment moisture using the bivariate Normal
distribution. Multivariate Analysis of Hydrologic Processes, Proceedings of the Fort Collins
International Symposium, July 15-17, 1985. Colorado State University, Fort Collins, USA, 519-530.
4. Hughes, DA (1986) Bivariate relationship between extreme rainfalls and antecedent catchment moisture status.
Proceedings of the Second South African National Hydrology Symposium, September 16-18, 1985
Pietermaritzburg, South Africa. 229-243.
5. Hughes, DA and Beater, AB (1987) A comparison between lumped and semi-distributed approaches to modelling
isolated flood events. Hydrological Sciences Symposium Proceedings: Volume II, Rhodes University,
Grahamstown, South Africa. 547-561.
6. Hughes, DA and Herald, J (1987) The application of deterministic catchment hydrological models: contemporary
problems and suggestions for a more unified approach. Hydrological Sciences Symposium Proceedings:
Volume II, Rhodes University, Grahamstown, South Africa. 500-508.
7. Hughes, DA and Stone, AW (Eds.) (1987) Proceedings of the 1987 Hydrological Sciences Symposium,
Volumes 1 and II, Hydrological Research Unit, Department of Geography, Rhodes University,
Grahamstown, South Africa.
8. Hughes, DA (1991) Catchment hydrological modelling: Where are we and where do we go from here? Fifth
South African Hydrological Symposium Proceedings: November 1991, University of Stellenbosch,
South Africa. 2.1.1-2.1.10.
9. Hughes, DA (1993) A Pragmatic Approach to Incorporating 'Real' Hydrology into a Catchment Simulation
Model. Proc. Sixth South African National Hydrological Symposium, Pietermaritzburg, South Africa,
Sept. 1993, 129-138.
10. Hughes, DA and van Ginkel, C (1993) Nutrient Loads in Runoff from Developing Urban Areas, a Modelling
Approach. Proc. Sixth South African National Hydrological Symposium, Pietermaritzburg, South
Africa, Sept. 1993, 483-490.
11. Sami, K and Hughes, DA (1993) A Comparison of Recharge Estimates from a Chloride Mass Balance and an
integrated Surface-Subsurface Semi-Distributed Model. Proc. Sixth South African National
Hydrological Symposium, Pietermaritzburg, South Africa, Sept. 1993, 767-776.
12. Smakhtin, VY and Hughes DA (1993) The Application of Automated Procedures for Low-Flow Analysis of
South African Rivers. Proc. Sixth South African National Hydrological Symposium, Pietermaritzburg,
South Africa, Sept. 1993, 329-336.
13. Hughes, DA, Murdoch, KA and Sami K (1994) A Hydrological Model Application System - a Tool for
Integrated River Basin Management. In C Kirby and W R White (Eds) Integrated River Basin
Development, John Wiley & Sons, Chichester, UK, 397-406.
14. O'Keeffe, JH, Palmer CG and Hughes DA (1994) Water quality in the Luvuvhu River and methods of predicting
the effects of flow modification. Chapter 12 in the Proceedings of the Workshop on Luvuvhu River
Instream Flow Requirements. Mountain View, N. Transvaal, July 1994.
15. O'Keeffe, JH, van Ginkel, CE, Hughes, DA, Hill, TR and Ashton PA (1994) The Buffalo River : A situation
analysis of water quality in the catchment. Proceedings of a workshop on "Practical application of water
quality management". Port Elizabeth Technikon, April, 1994, 118-133.
16. Sami, K and Hughes, DA (1995) Modelling runoff from surface-subsurface interactions in southern Africa.
Proc. 2nd Int. Conf. Hydrol. Processes in the Catchment, Cracow, Poland, April, 1995.
17. Hughes, DA (1995) The rainfall-runoff modelling programme of the FRIEND project - initial results. Proc. 7th
South African National Hydrology Symposium, Grahamstown, Sept. 1995.
18. Hughes, DA, Sami, K and Murray, R (1995) Rural water supply development - a perspective on the relevant
water source assessment issues. Proc. 7th South African National Hydrology Symposium,
Grahamstown, Sept. 1995.
19. Sami, K, Hughes, DA and Smakhtin, VY (1995) The application of a daily surface-groundwater model to
simulate low flows. Proc. 7th South African National Hydrology Symposium, Grahamstown, Sept.
1995.
20. Smakhtin, VY and Hughes, DA (1995) A pragmatic approach to patching or extending daily streamflow records
- examples and potential value. Proc. 7th South African National Hydrology Symposium,
Grahamstown, Sept. 1995.
21. Smakhtin, VY and Hughes, DA (1995) Low-flow studies in South Africa. Proc. Of the Int. Symposium:
Runoff Computations for Water Projects. St Pietersburg, Russia, November, 1995.
DA Hughes – General CV
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22. Smakhtin,VY., Hughes, DA., Watkins, DA., and Creuse-Naudin, E. (1997) Regionalization of daily flow
characteristics in South Africa. Proc. of Int. Conf. On Regionalization in Hydrology. Brawnschweig,
Germany.
23. Hughes, DA (1997) The cooperative development of a hydrological time series analysis and display software
package. Proc. 8th South African National Hydrology Symposium, Pretoria, Nov. 1997
24. Hughes, DA (1999) Hydrological information requirements for the determination of the Ecological Reserve for
South African Rivers. Proc. 9th South African National Hydrology Symposium, Western Cape, Nov.
1999.
25. Hughes, DA (2001)Practical problems associated with the implementation of the ecological Reserve for rivers.
Invited Des Midgley Memorial Lecture. Proc. 10th South African National Hydrology Symposium,
Pietermaritzburg, Sept. 2001.
26. Hughes, DA (2003) Incorporating ground water recharge and discharge functions into an existing monthly
rainfall-runoff model. Paper presented at the 11th South African National Hydrology Symposium, Port
Elizabeth, Sept. 2003.
27. Hughes, DA & Parsons, R (2005) Improved explicit ground water recharge and discharge simulation methods for
the Pitman model – explanation and example applications. Paper presented at the 12th South African
National Hydrology Symposium, Pretoria, Sept. 2005.
28. Smakhtin, V, Thenkabail, P, Gamage, N, Weragala, N & Hughes, D (2005). Drought assessment and monitoring
in South Asia using climate and remote sensing data. In: Proc. of the IWRA XII World Water Congress:
Water for Sustainable Development – Towards Innovative Solutions, New Delhi, India, November 2005.
Vol 3, 6.97-6.100.
29. Hughes, DA (2007) Simulating the hydrology and TDS of ephemeral rivers for the purpose of environmental
water determinations. Paper presented at the 13th South African National Hydrology Symposium, Cape
Town, Sept. 2007.
30. Kapangaziwiri, E & Hughes, DA (2007) The development of physically-based parameter estimations methods
for the Pitman monthly rainfall-runoff model. Paper presented at the 13th South African National
Hydrology Symposium, Cape Town, Sept. 2007.
31. Sawunyama, T & Hughes, DA (2007) Application of satellite derived rainfall estimates to extend water resource
simulation modeling in South Africa. Paper presented at the 13th South African National Hydrology
Symposium, Cape Town, Sept. 2007.
32. Clark, DJ, Hughes, DA, Meir, KB & Smithers, JC (2007) Hydrological decision support framework – current
progress. Paper presented at the 13th South African National Hydrology Symposium, Cape Town, Sept.
2007.
32. Hughes DA, Sawunyama, T and Kapangaziwiri, E (2008) Incorporating estimation uncertainty into water
resource development planning in ungauged basins in southern Africa. In: Sustainable Hydrology for the
21st Century, Proc. 10th BHS National Hydrology Symposium, Exeter. 7-12.
33. Clark, DJ, Hughes, DA, Meier, KB and Smithers, JC (2009) Development of a Hydrological Decision Support
Framework. Paper presented at the 14th SANCIAHS Symposium, Pietermaritzburg, KwaZulu-Natal, Sept.
2009.
34. Hughes, DA (2009) Uncertainty in hydrological model outputs: Implications for water resources estimation and
management. Paper presented at the 14th SANCIAHS Symposium, Pietermaritzburg, KwaZulu-Natal,
Sept. 2009.
35. Kapangaziwiri, E and Hughes, DA (2009) Assessing uncertainty in the generation of natural hydrology scenarios
using the Pitman monthly model. Paper presented at the 14th SANCIAHS Symposium, Pietermaritzburg,
KwaZulu-Natal, Sept. 2009.
36. Mallory, SJL, Hughes, DA and van Rooyen, P (2009) Quantifying uncertainty in reservoir yield analyses. Paper
presented at the 14th SANCIAHS Symposium, Pietermaritzburg, KwaZulu-Natal, Sept. 2009.
37. Sawumyama, T and Hughes, DA (2009) The application of satellite rainfall data in real-time hydrological
modelling in South African catchments. Paper presented at the 14th SANCIAHS Symposium,
Pietermaritzburg, KwaZulu-Natal, Sept. 2009.
38. Hughes DA and Muller, WJ (2010) Hydrological model and data analysis support for climate change adaptation
strategies within a South African water board. In: Role of Hydrology in Managing Consequences of a
Changing Global Environment, Proc. 3rd BHS International Symposium, Newcastle, UK.
Unpublished Conference, Symposia and Scientific Workshop Presentations
1. Hughes, DA (1986) The application of an isolated event model to ungauged catchments using relationships
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between parameter values and catchment physiography. Poster paper presented at IAHS Third Scientific
Assembly, Baltimore, Maryland, May 1989.
2. Hughes, DA (1987) Isolated event conceptual models: applicability to basins with different climate and
physiography. Paper presented at the IAHS workshop on Methods of runoff and streamflow simulation
applied to various physiographic and climate conditions, at the IUGG XIX General Assembly, Vancouver,
Aug. 1987.
3. Hughes, DA and Murdoch, K A (1991) The development of a flexible, PC based hydrological modelling system.
Paper and computer demonstration presented at the XVI General Assembly of the European Geophysical
Society, Wiesbaden, Germany, April 1991.
4. Hughes, DA and Murdoch, KA (1991) An integrated hydrological modelling system. Computer demonstration at
the 13th Annual Conference on Computers in Civil Engineering - Keeping Pace with Changing
Technology. University of Port Elizabeth, May 1991.
5. Hughes, DA and Smakhtin, V (1993) Processes, driving forces and potential indices of low flow hydrology.
Paper presented at the Low Flow Hydrology Seminar organised by the Water Research Commission and
DWA, Pretoria, February 1993.
6. Hughes, DA (1994) Low Flow Hydrology. Paper presented at the Workshop on Engineering Application of
Hydrology, preceding the Symposium '50 Years of Water Engineering', Johannesburg, July 1994.
7. Hughes, D A (1996) The rainfall-runoff modelling sub-programme of the Southern African FRIEND Project.
Paper presented at the 12th Journees Hydrologiques de L’ORSTOM, Montpellier France, October 1996.
8. Hughes, D A (1998) The need to incorporate magnitude-frequency concepts into the procedures used to set the
quantity component of the ecological reserve for rivers. Paper presented at the National Rivers Initiative
conference, June 1998, organised by the Southern Africa Society of Aquatic Scientists.
9. Hughes, D A, Watkins, D, Münster and Cobbing, B (1998) Hydrological extrapolation of past IFR results: A
contribution to the preliminary reserve methodology for South Africa rivers. Presented at the Workshop
on the Preliminary Reserve Programme held at DWAF, IWQS, Pretoria. July 1998
10. Hughes, DA (2003) Sustainable regional water resource development in the SADC region. Invited paper
presented at the 2nd Internat. Symp. On Integrated Water Resources Management. Stellenbosch. Feb.
2003
11. Hughes, DA (2004) Real time operation of environmental flows in South Africa. Poster and verbal presentation
at the British Hydrological Society International Conference, Imperial College, London, July 2004.
12. Hughes, DA (2005) Modelling semi-arid and arid hydrology and water resources – the southern Africa
experience. Invited presentation at the UNESCO, G-WADI Workshop, Roorkee, India, March 2005.
13. Hughes, DA (2005) Predicting ecological response to changing flow regimes for managing environmental flow
requirements. Verbal presentation at the VIIth Scientific Assembly of IAHS, Foz do Iguacu, Brazil, April
2005.
14. Hughes, DA (2007) Hydrological Variability: Coping with uncertainty in water resource management. Invited
paper presented at the World Bank Water Week, Washington DC, February 2007.
15. Hughes, DA (2008) Prediction in ungauged basins – challenges and research issues in southern Africa and the
way forward. Invited paper presented at the 9th Waternet conference, Johannesburg, October 2008.
16. Hughes, DA and Mallory, SJL (2009) Opportunities and constraints associated with implementing environmental
flow requirements in South Africa. Paper presented at the International conference on Implementing
Environmetal Flows, Port Elizabeth, Feb. 2009.
17. Hughes, DA (2010) Groundwater-surface water interaction: The need for a common understanding. Baseflow.
Invited presentation at the Water Institute of Southern Africa (WISA) Biennial Conference, Durban, April
2010.
18. Bryson, LK, Hughes, DA and Rowntree, KM (2012) A conceptual understanding of sedimentation in South
African catchments and the development of a new sediment model. Paper presented at the 16th South
African National Hydrology Symposium, Pretoria, Oct. 2012.
19. Hughes, DA (2012) Hydrological impacts of climate change in southern Africa – what do we really know? Paper
presented at the 16th South African National Hydrology Symposium, Pretoria, Oct. 2012.
Unpublished Reports, Papers and examples of Consultancy Reports
Apart from those specified below, I have generated many consultancy reports on various topics related to:
 Small scale water resource estimation and reservoir size design.
 Design floods.
 The surface water hydrology component of Environmental Management Programme reports.
DA Hughes – General CV
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

Surface water hydrology starter documents for environmental flow (the ‘Ecological Reserve’) determination
studies.
Desktop level environmental flow determinations for various catchments within southern Africa.
Hughes, DA (1973) A Study of meander pattern changes on the River Teifi near Lampeter. Undergraduate
dissertation, Department of Geography, U C W, Aberytswyth, 72 pp.
Hughes, DA (1978) Flooding and floodplain morphology. Unpublished PhD. Thesis, Dept of Geography, UCW,
Aberytswyth, 252 pp.
Hughes, DA (1983) The estimation of long term annual runoff ratios in the Southern Cape Coastal region.
Hydrological Research Unit, Special Report 2/83, Rhodes University, Grahamstown, 11 pp.
Hughes, DA (1983) Conceptual catchment model parameter transfer studies: application of models to
ungauged catchments in the Southern Cape Coastal lakes region. Hydrological Research Unit, Special
Report 4/83, Rhodes University, Grahamstown. 56 pp.
Hughes, DA and Görgens, AHM (1983) Hydrological investigations and research in the Southern Cape
Coastal Lakes region, 1979-1983. Summary and guide to reports. Hydrological Research Unit, Rhodes
University, Grahamstown.
Hughes, DA and Herald, J (1985) Hydrological Research in catchments of the eastern and southern Cape:
Progress report October 1983 to August 1985. Hydrological Research Unit, Special Report 1/85, Rhodes
University, Grahamstown. 21 pp.
Hughes, DA and Schultz, CB (1986) Preliminary investigations into flood hydrograph modelling in the
Swartkops catchment. Hydrological Research unit, Special Report No 2/86, Rhodes University,
Grahamstown, South Africa, 15 pp.
Hughes, DA (1987) Swartkops flood hydrograph study: Report at the end of Phase II. Hydrological Research
Unit, Rhodes University, Grahamstown, June 29 1988, South Africa.
Hughes, DA (1991) Chapter on Surface Hydrology in : Swartkops River Basin, Phase One : Situation Analysis.
Report by Environmental Services of the CSIR, Pretoria to The Algoa Regional Services Council, Port
Elizabeth.
Hughes, DA (1992) Proposed Dam : Uniondale. Confidential Report to Liebenburg & Stander (Consult. Engs.).
Hughes, DA & Sami, K (1993) The Bedford catchments: An introduction to their physical and hydrological
characteristics. Unpubl. Report to the Water Research Commission by the Institute for Water Research,
Rhodes University Grahamstown, South Africa.
Hughes, DA (Editor) (1994) Nahoon River Release : Environmental Monitoring. Report to Sub Directorate,
Environment Studies, Dept. of Water Affairs and Forestry.
Hughes, DA and Filmalter, E (1994) Water Quality Management Strategy for Wilderness, Swartvlei and
Groenvlei Lake Areas. Hydrological Assessment. Report to GFJ Inc. (Project Managers).
Hughes, DA and Smakhtin, V (1996) Inzinga Ranches - Loteni Area. Assessment of the hydrological impact of
afforestation. Prepared for Groundwater Consulting Services, June 1996. 17pp
Hughes, DA (1996) SAMRAND Development - Midrand, Assessment of the potential of the Rietspruit River
to supply irrigation water. Prepared for Groundwater Consulting Services, October 1996. 5pp
Hughes, DA, Sami, K and Smakhtin, V (1996) Sabie River Instream Flow Requirement Assessment, Hydrology
Starter Document. Sabie Sand IFR Workshop, August 1996, Dept. of Water Affairs and Forestry.
Hughes, DA and Smakhtin, V (1997) Tugela River IFR Revision - Hydrology. Chapter 5.1 in Thugela IFR
Refinement Workshop Starter Document, January 1997, Dept. of Water Affairs and Forestry.
Hughes, DA and Watkins, DA (1997) Maguga Dam IFR - Komati River, Hydrology Starter Document,
November 1997, Report to KOBWA.
Hughes, DA (1997) Mqanduli, Eastern Cape Province, Proposed Dam - Hydrological Design. Report to
Liebenberg & Stander, November 1997.
Hughes, DA (1998) Lusikisiki Bulk Water Supply Project : Assessment of available water resources of the
Xura River. Report to Department of Water Affairs and Forestry, Eastern Cape Region, Water Services
East. February 1998, 9pp.
Hughes, DA (1998) Reconnaissance Hydrological Survey and Potential Dam Yield Analysis, Ramisi Area,
Kenya. Report prepared for Groundwater Consulting Services.
Hughes, DA (2000) An assessment of the MIKE SHE hydrological model for application in South African
catchments. Report to the Water Research Commission, Pretoria
Hughes, DA (2004) Hydrological management for UK designated rivers. Application of the South African
‘Desktop Reserve’ model. Report to the Centre for Ecology and Hydrology, Wallingford, UK.
Hughes, DA (2004) Rio Muda, Mozambique – Water resource availability assessment. Report to MBB
DA Hughes – General CV
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Consulting Engineers, Pietermaritzburg.
Book Reviews
Hughes, DA and Weaver, A van B (1986) Review of British Rivers, J Lewin (Editor), George Allen and Unwin,
London, 1981. S A G J, 68 (1), 104.
Hughes, DA and Weaver, A van B (1986) Review of Rivers - Form and Process in Alluvial Rivers, K Richards,
Methuen & Co Ltd, London, 1982. S A G J, 68 (1) 105.
Hughes, DA (1986) Review of Water in Great Britain, C Kirby, Penguin Books, England, 1984. S A G J, 68(1),
105-106.
Hughes, DA (1988) Review of Scientific Procedures Applied to the Planning, Design and Management of Water
Resource Systems, edited by E Plate and N Buras, IAHS Publ. No 147, S A Geographer, 15 (1/2), 137139.
Hughes, DA (1988) Review of New Approaches in Water Balance Computations, edited by I van der Beken and A
Hermann, IAHS Publ. No 148, 1985. S A Geographer, 15 (1/2), 139-140.
Hughes, DA (1988) Review of Scientific Basis for Water Resources Management, edited by M Diskin, IAHS Publ.
No. 153, 1985. S A Geographer, 15 (1/2), 140-141.
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