Note that this template survey brief is a shortened version, which is provided here for nonEA users, because it is a vital component of the National Standard Contract and
Specifications for Surveying Services. Environment Agency staff should obtain the full
survey brief template from Richard.groom@environment-agency.gov.uk.
SURVEY BRIEF
The Conditions of Contract are as stated in the Invitation to Tender, Instructions to Tenderers,
Conditions of Contract and Contract Data of the Environment Agency National Standard
Contract and Specification for Surveying Services; with additional Conditions of Contract as
stated in this document.
This Survey Brief amplifies and amends the Environment Agency National Standard
Contract and Specification for Surveying Services (Version 3.2) and must be read in
conjunction with these specifications.
Nominated Employer’s Representative:
---------------------------------------------------------------------------------------------------------------Survey job number:
Survey job name:
---------------------------------------------------------------------------------------------------------------The Sections of Standard Technical Specifications, which shall apply to this Contract,
are as follows in addition to Sections I and II which are mandatory: Sections ….
---------------------------------------------------------------------------------------------------------------Purpose of Survey:
---------------------------------------------------------------------------------------------------------------Location and Extent of Survey: See contract mapping
---------------------------------------------------------------------------------------------------------------Delivery Schedule:
TENDER SUBMISSION DATE: NOON ON
STARTING DATE:
COMPLETION DATE FOR THE WHOLE SERVICES:
Completion Date for each section of the services (if applicable) – see Activities
Schedule
Delay Damages: £ ………… per working day
---------------------------------------------------------------------------------------------------------------Deliverable Information and Materials to be supplied by the Surveyor:
BY THE COMPLETION DATE ABOVE:
The data plotted on paper
Digital data
Report of Survey
Self Certification Form(s)
AFTER APPROVAL:
Amended data as required
1
---------------------------------------------------------------------------------------------------------------Known Hazards:
---------------------------------------------------------------------------------------------------------------Site Conditions/Restrictions, Access and Public Relations:
---------------------------------------------------------------------------------------------------------------Time Charge Maximum: If applicable a Time Charge Maximum of £n will apply to item 1
on the Activity Schedule for Landowner/Tenant investigation. This charge will not be
exceeded without written permission from the employer. The name, rate and time for the
investigator will be included on the invoice.
---------------------------------------------------------------------------------------------------------------Existing Survey Control:
---------------------------------------------------------------------------------------------------------------Technical Requirement
All survey results including the survey report are to be delivered as a zipped file email
attachment if the zipped file is smaller than 10Mb or on CD / DVD for larger data deliveries,
and one hard copy.
The following is to be copied and pasted into the survey report as a record of the survey
requirement.
Section I General Requirements applicable to all surveys,
All submitted documents shall have the EA job number in the file name.
Drawing files shall be named Ajobno-BB.dwg where A may be:
Letter
L
X
T
H
Meaning
Long section
Cross sections
Topographic map
Hydrographic chart
BB is a sequential sheet number – 01, 02 etc.
Weekly progress reports are to be prepared and delivered to EA Project Manager by email /
telephone.
Section II Survey Control
Tenderers to submit details of proposed survey control layout and observation method with
their tenders.
or
Tenderers are to establish survey control as shown on contractmapname.
RINEX data for all reference and rover observations are to be submitted with the survey
report.
EACS shall use the point numbering system in Paragraph 3.2.5 / a point numbering system
agreed with the client.
EACS description cards to be supplied as .pdf.
2
Section III Topographic Surveys
The site is to be surveyed at a scale of 1:200, the survey scale is to be used in conjunction
with the table under standard specification Section III, clause 4.0. The survey shall be
presented at a scale of 1:200.
The surveyor shall state what survey method(s) will be used.
or
The survey shall be carried out using ground survey methods.
or
The survey shall be carried out by photogrammetric methods using photography supplied by
the EA project manager. The photography is digital with a ground sampled distance of
0.05m.
or
Film photography has been flown at a scale of 1:3000. Surveyor will be provided with one set
of diapositives and one set of contact prints.
or
The Surveyor is required to fly new aerial photography of the site.
Ground verification (survey) is required of
photogrammetrically and where the required
photogrammetry.
areas which cannot
accuracy cannot be
be surveyed
achieved by
The following features are to be shown:
Roads, railways, tracks and footpaths
Buildings and structures
Fences, hedges and other boundaries
Water-related features
Street furniture
Service Utilities covers
Banks and retaining walls
The following features are to be considered critical detail (under the definition in Section I,
para 13.5)….
All individual trees with bole diameter of 0.15m or greater (measured 1m above ground
level) are to be surveyed.
The cover and / or invert level of inspection covers and manhole covers is to be surveyed.
Level strings (specification para 3.3) are required.
Levels on soft ground shall be correct within 0.05m r.m.s.e. and levels on hard features shall
be correct within 0.01m r.m.s.e. when checked by precise levelling from the nearest survey
control station.
A string digital terrain model (DTM) is required of the site. Contours are to be interpolated
from the DTM at a vertical interval of 0.25m with index contour at 1m intervals. Levels at
any point on the DTM surface shall be correct to within half the contour interval when
checked by precise levelling from the nearest survey control point.
3
The survey shall be delivered as an Autocad 3D model in accordance with the relevant
clauses of Section I.
Raw survey data shall be collected using static laser scanning.
Raw survey data shall be collected using mobile laser scanning with RGB values assigned to
points during simultaneous photography.
Section IV Channel Surveys
Tenderers shall allow within their pricing for one day walkover of the site with the EA
project manager / consultant.
Channel Survey data is to be supplied by surveyor in ISIS, HECRAS, Infoworks, MIKE11,
EEBY, formats.
Data shall be supplied in EACSD V3.2 format and include CES1 and CES2 data. EACSD
shall be passed through the Environment Agency’s on-line validator program and the
validation certificate presented in the survey report.
Open channel cross sections are to be surveyed at 100m intervals / at intervals indicated on
contract mapping / in approximate locations indicated on the contract mapping.
Channel hard bed levels are to be surveyed. Separate digital data files are to be provided for
hard and for soft bed data.
Cross sections are to extend 5m beyond the river bank into the flood plain.
Cross-section numbering is to be of the format X.YYY where X is a number 1-10 indicating
channel number (1 for main watercourse, 2etc for braids and subsidiary channels) and YYY
is cross-section number starting with 001 at downstream end of job and increasing upstream.
Cross-sections shall be presented at 1:100 natural scale. Longitudinal sections shall be drawn
at 1:2500 horizontal and 1:100 vertical scale or as agreed with the EA project manager.
Flood plain cross-sections are to be surveyed at 100m intervals.
Weirs and drop structures shall be surveyed if their head of water is 0.1m or greater.
A structure section shall be surveyed for all pipes crossing the water course which have a
diameter greater than 0.15m.
For upstream elevations of bridges and culverts, the downstream soffit, top of parapet, invert,
bed level and bank crests shall be shown ghosted on the section drawing.
Re: para 9.3.5. Outfalls entering the watercourse of 250mm diameter or greater shall be
surveyed and shown on the long profile.
Gaugeboard description cards are to be produced using template gaugeboard_blank.doc.
Flood / river banks indicated on the contract mapping are to be surveyed in accordance with
Clause 9.5 of the specification. Levels shall be taken on top of the coping and/or at base of
coping.
Section V Building Threshold Surveys
Only threshold level at the front door of each property is to be surveyed.
or
The threshold of all doors on each property is to be surveyed.
Ground level, air brick and damp proof course level is not required.
A photograph shall be taken of each property
or
4
Photographs shall be taken of groups of similar properties
or
No photographs shall be taken
Section VI Deformation Monitoring Surveys
A new monitoring system is required.
(Describe the objectives of the survey, the movements that are anticipated and the amount of
movement that you need to be able to detect over a specified period of time. Attach diagrams
and specify site visit with surveyor)
or
Surveyor is required to observe a monitoring survey of an existing monitoring system.
Section VII Hydrographic Surveys of River Channels and other water areas
Surveyor to observe top of silt and hard bed levels using a total station to a prism (or using
RTK GNSS) on a long pole on a 20m grid. Observations shall be made in accordance with
Section III of this specification. For observations on top of silt a flat-bottomed staff shall be
used. The water line shall be surveyed and all levels shall be plotted at 1:500 scale / The
levels shall be plotted on an OS MasterMap background at 1:2,500 scale. Data shall also be
supplied as comma delimited text files of Pt nr, E, N, Bed level. Separate files are to be
supplied for hard bed and for top of silt data. The volume of silt is to be computed. Hard and
soft bed sections are to be plotted on the lines indicated on the contract mapping.
Surveyor to observe bed level (top of silt) using a single beam echosounder on a sounding
line spacing of a maximum of 3m. The echosounder shall be controlled using RTK GNSS. A
grid with resolution 0.5m shall be interpolated from the soundings.
Surveyor shall use swathe multibeam echosounding. Surveyor shall deliver grid data with a
cell size of 0.5m. Data files shall be supplied in ESRI ASCII grid format / comma delimited
files of E, N, bed level.Dredging plans are required to be produced.
Section VIII – Beach Monitoring
Tenderers shall allow within their pricing for one day walkover of the site with the EA
project manager / consultant.
A base line / repeat survey is to be carried out.
A beach topographic survey is / is not required
A beach profile survey is required
Survey E2 stations shall be installed at 1000m intervals along the beach.
Heights on hard surfaces shall be correct within 30mm when checked by spirit levelling
from the nearest permanent control point. On soft surfaces the spot heights shall be accurate
to within +/- 50mm when checked by spirit levelling from the nearest permanent control
point.
For beach topography surveys, data is to be suitable for producing a DTM. Levels at any
point on the modelled surface shall be correct to within 0.15m when checked by precise
levelling from the nearest survey control point.
5
All terrain vehicles (ATV) may not be used.
Observations made with GNSS mounted on an ATV are to be corrected for pitch and yaw.
Photography of beach profiles:
Each profile line will be photographed from each end, looking along the profile.
At each profile line, photographs will be taken looking along the beach in both directions.
The photographs are to be taken from about 10m behind the profile line and near the defence
end. The point at which the photograph centreline cuts the profile will recorded on the profile
with a ‘photograph’ symbol and the photograph reference number.
General photographs of the beach will be taken at approximately 500m intervals.
Section IX Offshore Hydrographic Surveys
Section X
LiDAR specification is provided for guidance only.
Section XI Culvert Surveys
Section XII Site Services Surveys
Site services are to be surveyed to Level 3.
Contractor is required to obtain records from utility companies.
Surveyor is required to lift all manholes and survey cover and invert levels and pipe sizes.
Surveyor is required to produce diagrams for each manhole in accordance with Section XII,
para 6.2.
For Level 5 survey, the contractor is required to use close centred GPR over 50% of the site.
For Level 6 survey, trial holes are to be excavated at 3 locations to verify the identification
and location of services. Trial holes are to be backfilled following survey and the ground
made good.
Section XIII Post Flood Recording Surveys
Surveyor is required to gather post flood information in accordance with specification
paragraph 3.0
Surveyor is required to survey flood marks and other information as specified in paragraph
4.0
Section XIV Surveys of Ultrasonic Gauging Stations
Section XV Surveys of Gauging Weirs
Surveyor is required to carry out a standard survey.
Surveyor is required to carry out a standard survey with additional items as listed here /
shown on attached sketch.
Section XVI Borehole Surveys
Section XVII Provision, Installation and Maintenance of Wave and Tide Monitors and
Recorders
----------------------------------------------------------------------------------------------------------------
6
Signed:
Date:
7