Policy information sourced from the Harrow Development Management Policies
DM 9: Managing Flood Risk
Proposals requiring a Flood Risk Assessment must demonstrate that the development will be resistant and resilient to all relevant sources of flooding including surface water. The design and layout of proposals requiring a Flood Risk Assessment must contribute to flood risk management and reduction and:
- minimise the risk of flooding on site and not increase the risk of flooding elsewhere;
- wherever possible, reduce flood risk overall;
- ensure a dry means of escape for occupiers of residential development;
- achieve appropriate finished floor levels which, for residential development in flood zone 3, should be at least 300mm above the modelled 1 in 100 year plus climate change flood level; and
- not create habitable basements in areas of medium and high flood risk.
Proposals that would fail to make appropriate provision for flood risk mitigation, or which would increase the risk or consequences of flooding, will be refused.
Sites that are mapped as falling within Developed Zone 3B will be treated as having a high probability of flood risk, for the purposes of applying the sequential and (where necessary) exception tests, provided that the development would be safe and would not increase the risk or severity of flooding elsewhere. Opportunities will be sought from the redevelopment of sites in Developed Zone 3B to restore the natural function and storage capacity of the floodplain.
Sites that are mapped within Greenfield Zone 3B will be treated as functional floodplain for the purposes of applying the sequential and (where necessary) exception tests. Proposals that involve the loss of undeveloped floodplain or otherwise would constrain its natural function, by impeding flow or reducing storage capacity, will be resisted.
For more information please see the Development Management Policies