SuDS in London - a guide

4.4 LANDSCAPE WATER MANAGEMENT STRATEGY
Street scenario 1 (55%) – (49%)
4.4.1 WATER MANAGEMENT
Street scenario 2 (32%) - (5%)
Street scenario 3 (20%) – (4%)
bene
Street scenario 4 (38%) – (3%)
Street scenario 5 (26%) – (25%)
are as follows:
Street scenario 6 (29%) – (1%)
Street scenario 7 (20%) – (30%)
Street scenario 8 (9%) – (5%)
An in tegrated approach to water management in Nine
Elms Parkside could realise signi cant environmental
terms of water conservation, waste
minimization and pollution control. The purpose of the
strategy is to establish a hierarchy of interventions
that optimises the conservation and management
of water within the wider environment, and future
community. The key interventions to be incorporated
Podium Level Courtyards - Potential permeable
paving using drainage mats (indicative)
Permeable Surface/ Planting area - Rain
water will be absorbed, no water to enter into
underlying controlled waters
Swale - Water collected locally from roads and
paths and connecting into wider drainage
This analysis indicates that the
system
implementation of SuDS is potentially
more cost-effective than conventional
drainage in construction cost terms
alone. The range in the percentages is due
primarily to variables in the costs of paving
specifications.
Attenuation Basin - Overflow storage system
for rainfall event in excess of 1 in 30 year storm
Underground Storm Cell - Attenuating rainfall
from roof and paving before water enters the
drainage system. This can reduce peak runoff
flows to the allowable green field run-off rate
Many schemes within London will require
retrofitted design solutions. In these cases,
costs may be incurred in removing or
adapting existing infrastructure.
SuDS projects 60 often form part of
wider development proposals, where
the cost of sustainable drainage would
be integrated from the start and
economies of scale apply. In all situations,
adjacencies create variability when dealing
with different ownerships and boundaries.
Nine Elms linear park: SuDS as part
of wider development proposals
Illustrative Scheme Masterplan, 201 6
4.4 LANDSCAPE WATER MANAGEMENT STRATEGY
4.4.1 WATER MANAGEMENT
An in tegrated approach to water management in Nine
Elms Parkside could realise signi cant environmental
bene terms of water conservation, waste
minimization and pollution control. The purpose of the
strategy is to establish a hierarchy of interventions
that optimises the conservation and management
of water within the wider environment, and future
community. The key interventions to be incorporated
are as follows:
Podium Level Courtyards - Potential permeable
paving using drainage mats (indicative)
Permeable Surface/ Planting area - Rain
water will be absorbed, no water to enter into
underlying controlled waters
Swale - Water collected locally from roads and
paths and connecting into wider drainage
system
Attenuation Basin - Overflow storage system
for rainfall event in excess of 1 in 30 year storm
Underground Storm Cell - Attenuating rainfall
from roof and paving before water enters the
drainage system. This can reduce peak runoff
flows to the allowable green field run-off rate
Image courtesy of Camlins
135 7 Cost benefit