Drainage and Flooding
The legislation relating to flooding and drainage has continued to evolve, and since the last application, new guidelines and standards have been introduced, which the new development will incorporate.
The site is situated on the side of a valley. Most of the site drains via infiltration into subsoils and under gravity into drains that lead to Monktonmead Brook. Additionally, a couple of existing springs within the wooded areas flow through ditches into Monktonmead Brook.
Using sustainable drainage systems (SuDS), the proposals aim to mimic and improve upon the natural greenfield runoff rate. A drainage strategy is being developed to ensure that no additional surface water enters the existing drainage system due to the development.
The Pennyfeathers site will aim to attenuate and manage surface water across its area. Attenuation tanks within the park and under the large commercial parking areas will hold and slowly release surface water.
Permeable paving, linked to landscaped soakaways, ditches, and swales, will further attenuate and manage water quantity and quality before the surface water re-enters the water table and drainage system.
Pennyfeathers' foul water drainage is designed to connect to the existing drainage system east of Pennyfeathers, which connects to Sandown Water Treatment Works.
The current feedback period following the recent engagement event ended on 26th July 2024