Page 78 - Bexley SuDS DESIGN & EVALUATION

P. 78

Detailed Design 9.3.4 Detailed Design Evaluation Checklist Responsibility

The following table provides a list of key
The CIRIA SuDS Manual Table B.3 provides
considerations for design and evaluation.
other aspects for checking which may be
incorporated on a case by case basis.

Key design points
Key evaluation points
Deliverable
to check
Design
Designers should confirm how all Confirm allowable attenuation
rates. Confirm amenity and
standards have been achieved
standards
for quantity, quality, amenity and biodiversity requirements. LPA
biodiversity.
Confirm Where positive discharge is Review the level at which water LLFA
method & made to a watercourse / sewer, is stored relative to receiving

locations of consider likelihood of surcharge flood plain levels/sewer invert.
discharge on storage from the receiving Infiltration – review how
sewer / watercourse.
groundwater table level has been
Infiltration – outline how ground confirmed and how ground will
will be protected from be protected from compaction
compaction during construction. during construction. Review risk
of infiltrating close to buildings.
Review how infiltration on
brownfield sites has been
73 assessed.

Hydraulic Detailed checklist is contained The level of analysis required LLFA
calculations Section 9.5.10. should reflect the risk of failure,
scale of development and
complexity of drainage.
Detailed Levels are crucial – check that Sensibilty check to be performed LLFA
consideration there are no locations where low for each subcatchment,
of site and points might compromise design. comparing top level of storage,
drainage Designer to present drawing and lowest level of contributing
showing detailed levels across areas.
design levels
the site
Drainage Minimise risk of blockage by Review of inlets, outlets, flow LLFA
details designing protected outlets and controls, storage, edge details,
flow controls connection details to receiving
watercourse / sewers

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