Comment
South Norfolk Village Clusters Housing Allocations Plan (Reg. 18 Draft)
Representation ID: 2178
Received: 14/07/2021
Respondent: Norfolk County Council - LLFA
Please see attachments for full response.
Few or no constraints. Standard information required at a planning stage
1.] At risk of surface water flooding?: Yes * 3.33% AEP Event [Extent]: No flooding present * 3.33% AEP Event [Depth]: No flooding present. * 1.0% AEP Event [Extent]: Minor flooding * 1.0% AEP Event [Depth]: 0.00 - 0.30cm. * 0.1% AEP Event [Extent]: Minor flooding * 0.1% AEP Event [Depth]: 0.00 - 0.60cm.
2.] Internal & external flooding?: * On-site: No * Within proximity to site (~500.00m): Yes - Internal Flooding|Yes - External Flooding 3.] Watercourses [Online ordinary watercourses or mains rivers]?: * On-site: No * Within proximity to site (~100.00m): No 4.] Surface water sewer systems?: * On-site: No * Within proximity to site (~100.00m): No 5.] Source Protection Zone?: Source Protection Zone 3 6.] Internal Drainage Board?: No IDB referenced 7.] The site predominantly has superficial deposits of DIAMICTON. Comments on infiltration potential are dependent on a complete geotechnical investigation, including BRE365 Soakaway Testing. Where possible, surface water infiltration should be utilised.
Assessment: Green
The referenced site has been submitted as two separate polygons. We have reviewed and commented on the site as both polygons combined.The on-site flood risk forms a minor flow path in the 0.1% AEP event, contributing to a major flow path off-site in the 0.1% AEP event. Flood risk is concentrated to the southern boundary of the northern polygon and eastern boundary of the southern polygon. Flow lines indicate flood water flows east off of the site. We advise this must be considered in the site assessment.The road between the two polygons is affected by flood risk in the 0.1% AEP event. We advise this must be considered when assessing access to the site.There is opportunity to mitigate the flood risk leading off of the site.The majority of the site is unaffected by flood risk and has potential to be developed.