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You also need to know the flood zone your development is located in. The Environment Agency also provide these allowances in the peak river flow climate change allowances by management catchment table – you have to know your management catchment to get the information you need. Contact the Environment Agency if you are unsure which allowance to use. If so, use the allowances from the neighbouring management catchment to assess the risk for your development or site allocation. In some locations the dominant source of flooding will be from a neighbouring management catchment. select the management catchment for your location – the allowances appear in a pop-up box.search for your location by postcode, national grid reference or town in the ‘find address or place’ search box.
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access the climate change allowances for peak river flow map.To work out which management catchment allowances to use, you need to: Select the peak river flow allowances to use for your assessmentįor flood risk assessments and strategic flood risk assessments, the Environment Agency, as a statutory consultee, uses the management catchment climate change allowances from the peak river flow map as benchmarks. At the 95th percentile it is exceeded by 5%. At the 70th percentile it is exceeded by 30%. upper end allowance is based on the 95th percentileĪn allowance based on the 50th percentile is exceeded by 50% of the projections in the range.higher central allowance is based on the 70th percentile.central allowance is based on the 50th percentile.The 50th percentile is the point at which half of the possible scenarios for peak flow fall below it, and half fall above it. A percentile describes the proportion of possible scenarios that fall below an allowance level. The range of allowances is based on percentiles. Management catchments are sub-catchments of river basin districts. Peak river flow allowances show the anticipated changes to peak flow by management catchment. The Environment Agency may want to check how and why you used other data in your plans and proposals. For example, the impact of climate change on peak river flow may not be the same for all rivers in a management catchment. There may be circumstances where local evidence supports using other data or allowances. Exceptions – when it might be appropriate to use other data or allowances The Environment Agency uses climate change allowances when they provide advice on flood risk assessments and strategic flood risk assessments. They include figures for extreme climate change scenarios. There are allowances for different climate scenarios over different epochs, or periods of time, over the coming century. To increase resilience to flooding and coastal change, you should make allowances for climate change in your flood risk assessment. offshore wind speed and extreme wave height.What climate change allowances areĬlimate change allowances are predictions of anticipated change for: Local planning authorities should refer to these when they prepare local plans and consider planning applications. planning practice guidance on flood risk and coastal change.
#FLOOD FACTOR HOW TO#
The Environment Agency will check that you have used climate change allowances when they provide advice on flood risk assessments and strategic flood risk assessments.įor guidance on designing flood and coastal risk projects, schemes and strategies see Flood and coastal risk projects, schemes and strategies: climate change allowances.įor guidance on how to prepare a site-specific flood risk assessment see Flood risk assessments if you’re applying for planning permission.įor guidance on strategic flood risk assessments see How to prepare a strategic flood risk assessment.įor guidance on how the planning system will help minimise vulnerability and provide resilience to the impacts of climate change, see the:
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Making allowances for climate change in your flood risk assessment will help minimise vulnerability and provide resilience to flooding and coastal change. developers and their agents preparing flood risk assessments for planning applications, and development consent orders for nationally significant infrastructure projects.local planning authorities preparing strategic flood risk assessments.