TERM OF REFERENCE FOR CONSULTANCY SERVICES
Groundwater Artificial Recharge Pilot
Project at Wadi Deir AlKahf
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TERMS OF REFERENCE FOR CONSULTANCY SERVICES
Groundwater Artificial Recharge Pilot
Project at Wadi Deir AlKahf
CONTENTS
1- Introduction
2- Objectives
3-Scope of Work
4- Report Schedule
5-Time schedule
6- Payments
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Groundwater Artificial Recharge Pilot Project at Wadi Deir AlKahf
1. INTRODUCTION:
The objective of the Artificial recharge studies are to identify practical techniques for
using artificial recharge to improve the management of water resources in Jordan,
demonstrate the feasibility of such techniques through the study and implementation of
a pilot project, transfer the methodology of planning and implementing artificial
recharge projects to Jordanian specialist , and study potential of artificial recharge as an
essential element of integrated groundwater resources management in Jordan.
This document presents the detailed work plan for performance of activities which
will lead to the completion of the feasibility studies at Wadi Deir AlKahf site.
development in that area on the groundwater resources.
The study area:
During the field visit to the study area, three locations were selected for the design,
dams and barriers for the purpose of natural recharge, but the one site has been selected
to fit the specifications required to feed the natural recharge. As Shown in Table ( 1 ):
and Figure ( 1 ): The subcatchment of Wadi Huwaynil El Aritayn area
ID
Wadi Huwaynil El Aritayn
East
326650
North
1146702
The area is defined by the following coordinates :PGE 326650 to 1146702 PGN
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Figure ( 1 )
2. Objectives of Feasibility Study:
The main objective of the project is to demonstrate various artificial recharge
engineering and how they should be implemented in the field.
● Select the location.
● Evaluate the potential for artificial recharge using surface water runoff augment
and improve groundwater resource.
 Development the Hydrogeolgic setting, physical hydrology and additional data
needed to fill in any existing data gaps.
 Development of artificial recharge alternatives.
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 Definition of any additional information needed to complete the artificial
recharge design.
 Studies for the realisation of artificial recharge projects comprise the studies
carried out before constructions take place and the later monitoring studies
focusing on the assessment of the effects of the infrastrructure. To a large extent
the studies before construction are required for the design of the artificial
recharge infrastructure.
 Studies before construction
 Hydrological studies: These studies lead to the assessments of the amounts of
water that can be harvested and form the principal basis for the design of the
infrastructure. In the case of dam construction across wadis, the studies determine
the storage capacities of dams and the dimensions of their spillways. The studies
comprise the interpretation of rainfall and stream data using local rainfall gauges
and (a) hydrological monitoring station(s), the establishment of rainfall-runoff
relations, and the runoff quantities and peak events for typical storm events
considering long term rainfall data. Evaporation regimes will also e established
 Hydrogeological studies: The hydrogeological studies assess the presence of
suitable aquifers in a catchment capable to receive the harvested runoff. The
studies deal with the identification of, preferably over-exploited, aquifers using
mapping. The available aquifer storage will have to be assessed and the
infiltration and recharge mechanisms needs to be analysed. Aquifer storage
parameters will have to be assessed and infiltration tests may be carried out. Soil
water behaviour will have to be understood. The dynamic aquifer behaviour
should be established by groundwater level observations in wells in order to
confirm the presence and nature of aquifer recharge.
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 Water quality studies: These studies pertain both to the runoff and the
groundwater in the aquifer.
 Design studies
 Artificial recharge methods: Studies are engaged to identifiy the optimum
technique for artificial recharge comprising in-channel wadi methods, off channel
spreading methods, terracing, etc. Integrating the results of the studies carried out
before construction and taking into account the particular requirements of the
different methods, the optimum method or preferred mix of methods will have to
be established. Sites will have to be established for the construction of artificial
recharge infrastructure using a carefully designed methodology (e.g. multiple
criteria analysis).
 Conceptual and engineering design: Studies are to be prepared for the
determination of design parameters for the selected artificial recharge works.
Parameter values are to be based in particular on the results of the hydrological
and water quality assessments. The activities will also entail the preparation of
detailed engineering drawings and a Bill of Quantities that will be part of tender
documents.
 Effect monitoring
 Groundwater level impact study: This study intends to confirm the impact of
artificial recharge on the dynamic behavior of the aquifer..
 Water balance assessment: These studies focus on the compilation of water
balances or other methodologies to quantify the actual volumes of runoff that are
artificially recharging the aquifer. The assessments may depemd on the selected
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artificial recharge method. For in channel methods whereby retention structures
are constructed across wadis, water level behavior in the created reservoirs may
be followed up and residual flows at (a) hydrological monitoring station(s) may
be determined.
 Water quality impact study: This study aims to confirm or adjust the conclusions
of the water quality study carried out before dam construction
3. SCOPE OF WORK:
The aim of the feasibility of implementing artificial recharge at the site, and to
present information allowing for selection of the most feasible alternative. In order to
accomplish this, the project team will perform a series of inter-related tasks culminating
in the presentation of selected alternatives and supporting documentation. The
necessary tasks include:
 Task 1: Review of existing data
Extensive research was undertaken to compile and evaluate all relevant existing
data as part of the Phase I investigation and for development of this work plan.
 Task 2 : Hydrologic investigations to refine existing data in the area:
a)
b)
c)
d)
e)
f)
g)
Monitoring well in the area.
Aquifer characteristics testing.
Groundwater level measurement.
Groundwater sampling/analysis.
Stream sampling/analysis.
Soil/surface infiltration testing.
Subsurface soil sampling and analyses of the vadoze zone.
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Task 3 : Soil analysis
Soil analysis to represent the different soil types of the area, soil physical
properties type, permeability's, thicknesses (30) samples ,from (6) pits
distributed over the area to depth 0-2 meter.
Task 4 Water quality
-Recent water analysis from the selected existing wells to represent the
groundwater in the area (20 sample) including complete chemical analysis,
in addition to (PH, EC, T, turbidity, H2S) and Trace elements of (Fe, Mn,
Cu, CO, Pb, Ni) in addition (5) isotope samples -18O,Tritium (3H), Deterium
(2H) , 14C, within the area .
Task5 -Map showing present human development activities and planned
agricultural, industrial, urban and mining activities.
Task 5 : Hydrologic evaluations :
a) Stream, Runoff Analysis flow and Study the characteristic of the storm and
runoff including the runoff characteristics of the hydrograph
b) Estimation of Peak Discharge
Task 6 Hydro- geological studies
Task 7 : Engineering design work plan
The proposed project of site includes engineering design of. This work plan will
consider the following:
 Recharge facilities unit designs and dimensions (Dam, Dykes, terraces).
 Survey works and wadi cross sections in project Area
 Monitoring plans for the system (water quality, water quantity, metrology,
sedimentation).
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 Construction cost estimates.
 Construction schedule.
 Bidders package for project construction.
 Task 8: Feasibility study report.
1-Project description specifications
-Summary of data reviewed and collected during field activities, should include
geological mapping , cross sections, hydrologic map, soil properties, laboratory
testing .
2- Engineering design report and drawings.
3- Final report
*References of the collected and analyzed available data, should referred to data source
Time schedule
1-Interim Report about the accomplished activities achieved results after 45 days of
project commission.
2- Final report including engineering design report after 45 days of project commission.
Payments
Stage1- First payment: upon commissioning of the project( 20%) of the total budget.
Stage 2- Second payment: upon the approval of the first Interim report, , (30 %) of the
total budget.
Stage 3- Final payment: after approval of the final report, ,( 50% )of the total budget.
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