Page 147 - Enfield SuDS DESIGN & EVALUATION

Silt Inspect swales, ponds, wetlands annually for silt Site & SuDS 1 visit annually
accumulation

Silt Excavate silt, stack and dry within 10m of the SUDS Site & SuDS As required
feature, but outside the design profile where water Detailed Design
flows. Spread, rake and overseed.
Native Remove lower branches where necessary to ensure SuDS 1 visit annually
planting good ground cover to protect soil profile from
erosion.
Remedial Work

General Inspect SuDS system to check for damage or failure SuDS Monthly
SuDS when carrying out other tasks.

Undertake remedial work as required. As required

9.12.4 Silt and waste management

Silt and sediment removal is often considered Silt management and removal from site
a major element of SuDS management. In should follow the protocols set out in the
most cases where SuDS features are located SuDS Manual Chapter 32 p699
at the surface silt accumulates slowly and can
SuDS vegetation green waste can be
be removed easily. Management of silt managed in the same way as site green
becomes more difficult and costly at the end 142
waste, either on site in wildlife piles, compost
of the management train, particularly in arrangements or taken off site.
ponds and wetlands.
The use of composted green waste or
Where silt has accumulated in SuDS
chipped woody material should be
components downstream or the design has considered for raingardens, bioretention or
specifically included a silt collection feature,
any other planted feature on site.
for instance in SuDS retrofit schemes, it is
important to monitor silt accumulation Any waste considered to be contaminated
visually and by simple monitoring. should be evaluated as set out in the SUDS
Manual Chapter 33 – Waste management
Silt removed from most low to medium risk p709
sites can be de-watered and land applied
within the site but outside the SuDS EA Regulator Position Statement 055
component profile. The EA will not pursue an
www.gov.uk/government/uploads/
application for an environmental permit system/uploads/attachment_data/
where the requirements of Regulatory
file/525315/LIT_9936.pdf
Position Statement 055 are met.

Enfield Council SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates