Hillingdon SuDS Design & Evaluation Guide
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Detailed <strong>Design</strong><br />
73<br />
9.3.4 Detailed <strong>Design</strong> <strong>Evaluation</strong> Checklist<br />
The following table provides a list of key<br />
considerations for design and evaluation.<br />
The CIRIA <strong>SuDS</strong> Manual Table B.3 provides<br />
other aspects for checking which may be<br />
incorporated on a case by case basis.<br />
Deliverable Key design points Key evaluation points<br />
Responsibility<br />
to check<br />
<strong>Design</strong><br />
standards<br />
<strong>Design</strong>ers should confirm how all<br />
standards have been achieved<br />
for quantity, quality, amenity and<br />
biodiversity.<br />
Confirm Where positive discharge is<br />
method & made to a watercourse / sewer,<br />
locations of consider likelihood of surcharge<br />
discharge<br />
on storage from the receiving<br />
sewer / watercourse.<br />
Infiltration – outline how ground<br />
will be protected from<br />
compaction during construction.<br />
Hydraulic Detailed checklist is contained<br />
calculations Section 9.5.10.<br />
Detailed Levels are crucial – check that<br />
consideration there are no locations where low<br />
of site and points might compromise design.<br />
drainage<br />
<strong>Design</strong>er to present drawing<br />
design levels<br />
showing detailed levels across<br />
the site<br />
Drainage Minimise risk of blockage by<br />
details designing protected outlets and<br />
flow controls<br />
Confirm allowable attenuation LPA<br />
rates. Confirm amenity and<br />
biodiversity requirements.<br />
Review the level at which water LLFA<br />
is stored relative to receiving<br />
flood plain levels/sewer invert.<br />
Infiltration – review how<br />
groundwater table level has been<br />
confirmed and how ground will<br />
be protected from compaction<br />
during construction. Review risk<br />
of infiltrating close to buildings.<br />
Review how infiltration on<br />
brownfield sites has been<br />
assessed.<br />
The level of analysis required LLFA<br />
should reflect the risk of failure,<br />
scale of development and<br />
complexity of drainage.<br />
Sensibilty check to be performed LLFA<br />
for each subcatchment,<br />
comparing top level of storage,<br />
and lowest level of contributing<br />
areas.<br />
Review of inlets, outlets, flow LLFA<br />
controls, storage, edge details,<br />
connection details to receiving<br />
watercourse / sewers<br />
London Borough of <strong>Hillingdon</strong> <strong>SuDS</strong> D & E <strong>Guide</strong><br />
© 2018 McCloy Consulting & Robert Bray Associates
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