Page 78 - Updated SuDS Design & Evaluation Guide-Newham V3 Spreads

P. 78

Detailed Design 9.3.4 Detailed Design Evaluation Checklist Responsibility Deliverable Key design points Key evaluation points Responsibility Detailed Design

to check
The CIRIA SuDS Manual Table B.3 provides
The following table provides a list of key
Drawings should confirm
Sensibility check to be
hydraulic
LLFA
considerations for design and evaluation.
other aspects for checking which may be
volumes provided and refer back performed to ensure that
calulations &
incorporated on a case by case basis.
sufficient storage is provided to
to hydraulic analysis
drawing
requirements. Drawings
meet hydraulic calculations.
volumes
references / annotations should
Key evaluation points
match
Deliverable
Key design points
to check
clearly relate to calculations.
Design
Designers should confirm how all Confirm allowable attenuation
maintenance / operation by
users and operatives of the
hazard & risk
standards have been achieved
rates. Confirm amenity and
standards
personnel and day to day site
scheme.
assessment.
for quantity, quality, amenity and biodiversity requirements. LPA Designers To consider construction, Demonstrate safe design for LPA & LLFA
biodiversity. use by public.
Confirm Where positive discharge is Review the level at which water LLFA Long sections Cross sections should not use Review in general, side slopes LPA & LLFA
method & made to a watercourse / sewer, is stored relative to receiving and cross exaggerated vertical scales to and depths shown.
locations of consider likelihood of surcharge flood plain levels/sewer invert. sections allow proper understanding of
discharge on storage from the receiving Infiltration – review how how scheme will actually look
sewer / watercourse. Outline any SuDS specific Ensure plants from accredited LPA & LLFA
groundwater table level has been Planting
Infiltration – outline how ground confirmed and how ground will design & planting requirements. source to minimise risk of
will be protected from be protected from compaction schedule invasive species.
compaction during construction. during construction. Review risk Landscape Integrate SuDS within the wider Check that the SuDS network is LPA & LLFA
of infiltrating close to buildings. design landscape design accessible, multifunctional and
Review how infiltration on contributes to the overall
brownfield sites has been drawings landscape quality.
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Consents & Vary and can include: discharge Check that relevant consents are LPA & LLFA &
Hydraulic Detailed checklist is contained The level of analysis required LLFA permits consents; offsite works & 3rd in place or can be obtained in EA & IDB &
calculations Section 9.5.10. should reflect the risk of failure, party access consent. The list of principle.
scale of development and Thames Water
required consents may be initially
complexity of drainage.
defined at pre-app discussion.
Detailed Levels are crucial – check that Sensibilty check to be performed LLFA
consideration there are no locations where low for each subcatchment, Maintenance Key plan (1 side of A4) detailing Maintenance type & cost is LPA & LLFA
of site and points might compromise design. comparing top level of storage, the maintenance regime and appropriate & proportionate and
identifying key maintenance
features are easily accessible.
drainage Designer to present drawing and lowest level of contributing
showing detailed levels across areas. locations such as outlets and Design achieves passive
design levels
the site flow control locations. maintenance where possible.
Drainage Minimise risk of blockage by Review of inlets, outlets, flow LLFA Adoption Confirmation of commitment to Review that sufficient safeguards LPA, LLFA,
details designing protected outlets and controls, storage, edge details, arrangements adopt aspects of the scheme are in place for the long term
flow controls connection details to receiving being offered for adoption. maintenance and operation of Thames Water
& Highways &
watercourse / sewers Confirmation of ownership and the drainage. Consider the
IDB & WaSC
maintenance responsibilities for potential impact of replacement
all parts of the SuDS scheme of propriety products.
which are not being adopted.

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