Policy information sourced from the Northill Neighbourhood Plan
NP8: Flood Risk & Drainage Management
- Development proposals will be expected to:
- Be designed and constructed so that the overall level of flood risk within the parish will not increase;
- Provide appropriate and effective surface water drainage demonstrating compliance with established guidelines including use of Sustainable Drainage Systems (SUDS) to ensure no net increase in run off. Surface water discharge to a public surface water sewer is seen as a last resort and if necessary must not exceed the green field rate. SUDS is Anglian Water’s preferred method of surface water disposal;
- Infiltration devices should allow at least 1m freeboard between the bottom of the device and the seasonal groundwater table. Infiltration proposals need to be supported by ground investigation and infiltration rates; and
- Because of proximity to Flood Zones, the applicant for any development must be required to appraise the risk from these watercourses to demonstrate that the development will be safe from flooding and steered away from parts of the site that are at higher risk of flooding
- Development will not be permitted in flood attenuation areas where that development would reduce the ability of these areas to alleviate flooding
- Proposals will need to show that development has avoided the loss of open water courses through culverting with existing culverted sections opened where viable
- Any new development must have adequate receiving surface water drainage, i.e. drains, culverts and definable water courses, agreed in consultation with Environment Agency and LLFA, Internal Drainage Board, Highways and Water Company
- In areas with known drainage problems, shown on the Policy Map, developers will be required to demonstrate how they have sought to mitigate against drainage problems through design. Opportunities are to be sought for reduction in flood risk to relieve pressure on the existing drainage networks within Northill parish
- Developers must ensure that appropriate measures are secured to ensure the adoption and ongoing maintenance of the surface water drainage provisions and flood prevention measures. Maintenance arrangements must avoid excessive burden on home owners
- Developers must liaise with Anglian Water and prepare a rigorous drainage strategy to demonstrate that the capacity within the local foul sewage network is available or could be made available in time to serve development proposals. The strategy must show the adequacy of the local sewer system and that new connections will not increase the risk of flooding. The discharge of surface water to existing public foul or combined sewers is not permitted
For more information, please visit the Northill Neighbourhood Plan