Paragraph 57 Flood risk
No alteration to ground levels or other construction work, other than preliminary work, may take place until—
a scheme to ensure authorised works are flood resilient in accordance with sub-paragraph (2) has been prepared or verified by a suitably qualified and experienced professional in respect of the land where those authorised works are to be located, and
the site controller has submitted the scheme to the Secretary of State for approval and the Secretary of State has endorsed it.
The scheme must—
be based on detailed modelling of fluvial and surface water flooding, and include details of that modelling;
include an OS plan that, using contrasting shading—
identifies each part of the Order land that is likely to be affected by fluvial flooding if the design flood event applicable to fluvial flooding occurs;
indicates the annual probability of each part of the Order land being subject to fluvial flooding using the classification in Table 10;
set out suitable measures to manage flood risk that are substantially in accordance with the flood risk mitigation measures contained in reference document 14 (flood risk assessment).
Table 10
Classification of flood zones
| Probability | Description of land within zone |
|---|---|
| Low | Land with a less than 0.1 per cent annual probability of fluvial flooding |
| Medium | Land with between 0.1 per cent and 1 per cent annual probability of fluvial flooding |
| High | Land with a 1 per cent or greater annual probability of fluvial flooding |
| Very high | Land classified as functional floodplain |