Comment

Representation ID: 2180

Received: 14/07/2021

Respondent: Norfolk County Council - LLFA

REVA:
Please see 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]: Minor flooding * 3.33% AEP Event [Depth]: 0.00 - 0.90cm. * 1.0% AEP Event [Extent]: Minor flooding * 1.0% AEP Event [Depth]: 0.00 - 0.90cm. * 0.1% AEP Event [Extent]: Minor flooding|Moderate flooding * 0.1% AEP Event [Depth]: 0.00 - 1.20cm. 2.] Internal & external flooding?: * On-site: No * Within proximity to site (~500.00m): Yes - Internal 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): Yes 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.

The on-site flood risk forms a minor/moderate flow path in the 0.1% AEP event, contributing to a major flow path south of the site. Flood risk is concentrated to the eastern/southeastern site boundary with flow lines indicating water flow south off of the site. We advise this must be considered in the site assessment.We advise there is opportunity to mitigate the flood risk leading off of the site. A large area of the site is unaffected by flood risk and has potential to be developed.

REVB:
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]: No flooding present * 1.0% AEP Event [Depth]: No flooding present. * 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 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 CLAY AND SILT. Comments on infiltration potential are dependent on a complete geotechnical investigation, including BRE365 Soakaway Testing. Where possible, surface water infiltration should be utilised.

Flooding on-site is very minor, concentrated to the southern boundary/road area.The site is immediately adjacent to another allocated site (Ref: SN0274REVA). Consideration of how each site may impact each other/off-site flood risk must be considered in the site assessment.

OVERALL: Green