DELETE AS REQUIRED
Weetwood Services Ltd (Leeds)
t: 0113 244 1377
e: info@weetwood.net
w: www.weetwood.net
Weetwood Services Ltd (London)
t: 203 757 5444
e: info@weetwood.net
w: www.weetwood.net
Weetwood Services Ltd (Mold)
t: 01352 700045
e: info@weetwood.net
w: www.weetwood.net
Proposed Residential Development
Land off …..
Survey Specification
Prepared by:
Name and qualifications
Position:
position, Weetwood Services Ltd.
Contact Details:
<Insert email and tel no>
Date:
DD/MM/YYYY
INTRODUCTION
1. The following survey specification has been prepared by Weetwood Services Ltd
(“Weetwood”).
Site Location
2. The site is located <insert location, grid ref etc> as shown in Figure 1. Add information
about the watercourses flowing through/near the site.
SURVEY REQUIREMENTS
3. The following sections outline what we will require in terms of survey information.
Cross Sections
4. In-bank and out-of-bank cross-section surveys are required for name of watercourse(s).
The extent of the survey required is indicated within Figure 2.
5. The cross-sections should be spaced approximately every <EA recommends 20 – 25 times
channel width; for a small stream, 50m spacing is typical >
6. The sections shall be prepared looking downstream, with zero chainage at the left extent of
the floodplain.
7. Record / take notes of:





Channel bed levels
Left and right bank top levels
Water level at the time of survey
Any other noteworthy feature
Photographs at all cross-sections
©Weetwood
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<Date>
<Site>
River Channel & Floodplain Survey Requirements
8. The sections in-bank should be at right angles to the direction of flow. The sections out-of
bank at the same locations should be at right angles to the overall general direction of flow
of the river.
9. The extent of levelling beyond the top of bank into the floodplain shall extend until ground
levels rise by more than 2 m or for 10m beyond the bank crest level, whichever is the
greater (or <should be to the crest of the embankment>).
Structures
10. There are approximately (insert number) identified structures within the survey reach,
which require surveying (see Figure 2). Additional structures noted whilst on site should
also be surveyed (if in doubt please ask your team to call <insert Weetwood contact name
and number> for advice).
11. The additional information and cross-sections required at each structure is detailed in
Table 1.
Bank Crest Levels
12. Embankment crest levels along the right and left bank of all the surveyed watercourses
(i.e. insert names of watercourses) are required.
13. If no embankment exists then the bank crest level is required. Level spacing should be
approximately every 5m, unless there is a significant change in gradient in which case
greater detail is required. Localised low points should be recorded.
Deliverables
14. The information required is presented in Table 2.
©Weetwood
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nnnn/Survey spec v1.0
<Date>
<Site>
River Channel & Floodplain Survey Requirements
Table 1:
Structure Requirements
Structure
Cross-sections
Bridge
Three required:
 Upstream (at point of
maximum backwater)
 Upstream face
 Downstream (at point
where normal depth reestablishes)


Two required:
 Upstream (at point of
maximum backwater)
 Downstream (at point
where normal depth reestablishes)


Culvert
Information Required







Weir
Sluice or Gate
©Weetwood
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Two required:
 Upstream edge of weir
 Downstream at toe of
weir

Upstream & downstream
cross-sections are
required if the channel
width changes
3
Invert & soffit elevation
Number of spans; span widths and
shapes
Bridge deck (road) elevations,
length & width
Bridge skew angle
Photographs (with indication of
scale)
Invert & soffit elevation
Culvert shape, plus width & height
dimensions
Culvert length
Headwall elevations, length &
width
Material of culverts
Photographs (with indication of
scale)




Crest length
Crest elevations
Weir width and shape
Photographs (with indication of
scale)


Number of gates
Gate opening dimensions and
levels
Photographs (with indication of
scale)

nnnn/Survey spec v1.0
<Date>
<Site>
River Channel & Floodplain Survey Requirements
Table 2:
Deliverables
Product
Copies
Excel spreadsheet (as per enclosed template) defining all survey points by:
 Elevation (mAOD)
 Chainage from left extent of the cross-section
 OSGR (eastings and northings)
 Description of significant points (e.g. top of bank etc.).
 Distance between cross-sections
1 digital
Photographs (including an indication of scale, if possible) of:
 Upstream and downstream faces of structures.
 Representative channel and floodplain vegetation for each cross-section.
 Significant features along the survey reach that may affect flow and/or
flooding patterns
 Any other feature that the Surveyor is unsure about.
Map showing location of photographs
1 digital
or hard
1:1250 plan based on OS mapping showing the line and location of the sections,
chainages, crest and road levels.
1 digital
Dimensioned elevations of bridges, culverts and similar structures.
©Weetwood
www.weetwood.net
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nnnn/Survey spec v1.0
<Date>
<Site>
River Channel & Floodplain Survey Requirements
Figure 1: Site Location
©Weetwood
www.weetwood.net
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nnnn/Survey spec v1.0
<Date>
<Site>
River Channel & Floodplain Survey Requirements
<Insert plan identifying structures to be identified>
Figure 2: Survey Extent
©Weetwood
www.weetwood.net
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nnnn/Survey spec/v1.0
<Date>
Delivering client focussed services
Flood Risk Assessments
Flood Consequences Assessments
Surface Water Drainage
Foul Water Drainage
Environmental Impact Assessments
River Realignment and Restoration
Water Framework Directive Assessments
Flood Defence Consent Applications
Sequential, Justification and Exception Tests
Utility Assessments
Expert Witness and Planning Appeals
Discharge of Planning Conditions
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