19, April, 2016 By Gecko Posted in Part L Flood risk assessments – England SHGL – Sustainability Homes Consultancy produces Flood risk assessment to satisfy flood issues in line with planning applications. Contact us to speak to one of our assessors to help with your development. 01519330328 or 020 3286 201 or [email protected] Overview – Flood Risk Assessments (England) There are many different sources of flooding including rivers, tidal, groundwater, surface water, sewers, canals and reservoirs. With climate change predicted to cause more frequent high intensity rainfall events and rising sea levels, flooding is likely to become an increasing problem. Under the National Planning Policy Framework a site-specific Flood Risk Assessment is required in support of the planning application where development is proposed on: – sites in Flood Zone 1 which comprise 1ha or above – sites located in Flood Zones 2 and 3 (including where proposals are for minor development and change of use) – depending on the vulnerability classification of the development, the Sequential Test or both the Sequential and Exception Tests would need to be addressed – any areas within Flood Zone 1 which has critical drainage problems (as notified to the local planning authority by the Environment Agency) The flood zone classifications are based on the flood maps provided by the Environment Agency and are based on flood outlines associated with fluvial, tidal and coastal risk. The Flood Risk Assessment must consider the risk of flooding from these sources and all other sources (including ground water, surface water, canals & reservoirs, sewers), and demonstrate how any risk to the site and surrounding areas can be appropriately managed. Particular consideration must be given to the sustainable management of surface water runoff, with the Flood Risk Assessment demonstrating how there will be no increase in peak rates of surface water runoff from the redeveloped site (when compared with the existing situation) through the use of Sustainable Drainage Systems (SuDS). The scale of and level of detail to be included in the Flood Risk Assessment is dependent on the flood risk and the vulnerability classification of the proposed development. In some cases, a simple Flood Risk Assessment would be sufficient, and in others more detailed 1d or 1d/2d hydraulic modelling of watercourses may be required.