SLP KDBH Extracts - Flipbook - Page 103
amenity, recreation, conservation of biodiversity and landscape character, as well as
flood alleviation and water quality control. Developers are encouraged to secure
reduction of flood risk by the provision or enhancement of green infrastructure and
the inclusion of an on-site attenuation.
8.
At an early stage, developers must ensure that adequate space is made for the
above ground storage of surface water within the design layout of all new
developments to support the full use of sustainable drainage systems (SuDS) and
must demonstrate that improvements to water quality will be maximised through
consideration of a range of techniques. All developments must explore opportunities
to provide betterment in terms of water quality and quantity to the wider area and
provide evidence as to the potential for cumulative benefits to be delivered through
the implementation of a strategic approach to risk reduction.
Water Quantity
9.
On all development sites, surface water discharge rates to any drain, sewer or
surface water body shall be limited to the equivalent site specific greenfield run off
rate. Where it is proposed to discharge runoff at rates greater than greenfield rates,
developers will be required to demonstrate why it is not feasible to achieve greenfield
rates and to secure agreement from the Council as Lead Local Flood Authority ahead
of submission of any application.
10.
In all cases, the greenfield runoff rate shall be agreed with the Council as Lead Local
Flood Authority, the Environment Agency, Severn Trent Water and the Canal and
River Trust, as appropriate. The greenfield runoff rate should take into account the 1
in 1 year, 1 in 30 year and 1 in100 year rainfall events, including climate change
allowances.
Flood Risk Reduction
11.
Developers shall explore opportunities to contribute towards the objectives of
relevant Catchment Flood Management Plans and Flood Risk Management Plans.
Development must promote the reduction of flood risk by seeking to reinstate the
natural floodplain, and the de-culverting and improvement of on-site watercourses.
Development should be set back at least 8m (from the top of bank or toe of a flood
defence) of Main Rivers and 5m from Ordinary Watercourses for maintenance
access. This includes existing culverted watercourses.
12.
New development will not normally be permitted within areas at risk of flooding.
Where it is clearly demonstrated that there are no other viable sites at lower risk of
flooding, consideration will be given to development in such locations, providing that
it is designed to be safe from the effects of flooding and will minimise flood risk on the
site and reduce risks elsewhere. Applications for new development where there is a
flood risk issue must be accompanied by a site specific flood risk assessment Such
assessments should be completed having regard to this policy and National
Guidance.
13.
Developers must demonstrate that the layout and design of a development, including
the finished floor levels, and the drainage system take account of both fluvial and
surface water flows in extreme events so as to avoid flooding of properties, both
within and outside the site.
10
3
103