Strategic Flood Risk Assessment - Hambleton District Council

1.0 INTRODUCTION
1.1 Hambleton District Council Engineering Section was commissioned in July
2004 to undertaking a Stage 1 Flood Risk Assessment study as part of the
preparation of the Local Development Framework (LDF). The LDF will replace
the current District Wide Local Plan and will set out policies and proposals for
the development of the District to 2021.
1.2 This Stage 1 assessment identifies:-
• Areas which could be developable subject to the sequential
characterisation of flood risk and the provision of an appropriate Flood
Risk Assessment where required (i.e. those areas in Flood Zones 1, 2 &
3).
• Areas where potential additional flood risks have been identified. These
areas could be developable subject to the provision of an appropriate
Flood Risk Assessment.
1.3 Detailed assessments of individual sites are to be undertaken where
necessary under a Stage 2 process outside the remit of this report once
‘Preferred Option’ allocation proposals have been developed.
1.4 All of the maps and plans in this report are based from the Environment
Agency September 2005 Flood Zone map. The Agency has a continuous
programme of reviewing its assessments of flood risk. This may lead to
adjustments to those areas defined as at risk, and updated Flood Zone maps
are regularly issues. This document should therefore be cross referenced
with the latest Flood Zone maps, which can be viewed on the Environment
Agency’s website – www.environment-agency.gov.uk.
1.5 The data on the Flood Zone map illustrates Flood Zones as defined by the
Government’s Planning Policy Guidance Note 25 on “Development and Flood
Risk” for England (PPG25) dated July 2001. These Flood Zones illustrate the
probability of flooding across England for planning.
1.6 Three levels of risk are identified:-
Zone 3 - High Risk This is the Agency’s best estimate of the area of land at
risk in a flood with a 1% (1 in 100) chance or greater of occurring in any in
any year from rivers and 0.5% (1 in 200) chance or greater from the sea.
Zone 2 – Low to Medium Risk This is the Agency’s best estimate of the area
of land at risk in a flood with between a 0.1% (1 in 1000) chance or greater
and a 1% (1 in 100) chance of occurring in any one year from rivers. And
between 0.1% (1 in 1000) or greater and 0.5% (1 in 200) chance of occurring
in any one year from the sea.
Zone 1 – Little or No Risk The remaining land is the Agency’s best estimate
of the area of land at risk in a flood with a 0.1% (1 in 1000) chance or less of
occurring in any one year from river, tidal or sea.
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