Local Plan 2036: Issues and Options Stage

Document Section 1. North Somerset Local Plan 2036: Issues and Options Document Banwell Garden Village Q11. Do you agree with the principles set out for Banwell Garden Village and would you suggest any changes to these? We consider that establishing the principles is a fundamental step towards developing the detail for development in these areas. [View all comments on this section]
Comment ID 21252257//9
Respondent Environment Agency [View all comments by this respondent]
Response Date 10 Dec 2018
Comment

M5 to A38 Transport Corridor (Up to 5,400 dwellings), these need to be located on higher ground out of the fluvial floodplain. The low lying land around Way Wick and the Rolstone area has drainage issues as well as fluvial floodplain. Proposed developments would need to provide reduced runoff rates and long term storage.

The Banwell and Churchill areas are located in Flood Zone 1 but have potential to add an increased rate and increased volume of surface water into the main rivers and floodplains. Additional surface water draining to main-river will mean drainage networks will further struggle to drain into main-river and therefore fields will remain wetter for longer. Proposed developments would need to provide reduced runoff rates and long term storage to prevent volume increase. Alternatively/additional strategic flood solutions, as utilised on the River Banwell downstream of the M5, could be implemented downstream of the garden village locations.

Pumping stations may also be required to pump water from low lying areas into main rivers and the main IDB watercourses, where gradients are shallow, or from areas which are also suffering from drainage issues.

Summary
M5 to A38 - avoid homes in fluvial floodplain. Way Wick/Rolstone has drainage issues. Provide reduced runoff rates/long term storage. Banwell/Churchill are Flood Zone 1 but could increase rate/volume of surface water to main rivers/floodplains - fields staying wetter longer. Provide reduced runoff rates/long term storage. Alternatively/additional strategic flood solutions downstream of the garden villages. Pumping stations may be required where gradients are shallow or drainage issues exist.
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