WWNP Runoff Attenuation Features 3.3% AEP
This dataset has been produced as part of the Mapping Potential for Working with Natural Processes research project (SC150005). The project created a toolbox of mapped data and methods which enable operational staff in England to identify potential locations for Working with Natural Processes (WWNP). Data has been produced for each intervention covered by the project. The final outputs include the following datasets: • Floodplain Woodland Planting Potential • Riparian Woodland Planting Potential • Wider Catchment Woodland • Floodplain Reconnection Potential • Runoff Attenuation Features 3.3% AEP • Runoff Attenuation Features 1% AEP • Woodland Constraints Runoff Attenuation Features Potential is our best estimate of locations of high flow accumulation across the land surface or in smaller channels, where it may be possible to temporarily store water and attenuate flooding during high flows. The dataset is designed to support signposting of areas to target enhanced storage. It is based upon the Risk of Flooding from Surface Water datasets and identifies areas of high flow accumulations for the 3.3% Annual Exceedance Probability surface water maps. The areas of ponding or accumulation are between 100 and 5000 metres squared, and have been tagged where they fall on an area of slope steeper than 6% as gully blocking opportunities. All the potential areas have been constrained so that they are not in urban areas or on roads, rails or canals. The data does not does not provide information on design, which may need to consider issues such as drain-down between flood events. It is important to note that land ownership and change to flood risk have not been considered. Locations identified may have more recent building or land use than available. Further information on the Working with Natural Processes project, including a mapping user guide, can be found in the reports published here: https://www.gov.uk/government/publications/working-with-natural-processes-to-reduce-flood-risk Attribution statement: © Environment Agency copyright and/or database right 2015. All rights reserved.
dataset
protocol: http
name: WWNPRunoffAttenuationFeatures33AEP-FGDB.zip
description: WWNPRunoffAttenuationFeatures33AEP-FGDB.zip download on Defra Data Services Platform
protocol: http
name: WWNPRunoffAttenuationFeatures33AEP-GML.zip
description: WWNPRunoffAttenuationFeatures33AEP-GML.zip download on Defra Data Services Platform
protocol: http
name: WWNPRunoffAttenuationFeatures33AEP-MID_MIF.zip
description: WWNPRunoffAttenuationFeatures33AEP-MID_MIF.zip download on Defra Data Services Platform
protocol: http
name: WWNPRunoffAttenuationFeatures33AEP-SHP.zip
description: WWNPRunoffAttenuationFeatures33AEP-SHP.zip download on Defra Data Services Platform
protocol: http
name: WWNPRunoffAttenuationFeatures33AEP-TAB.zip
description: WWNPRunoffAttenuationFeatures33AEP-TAB.zip download on Defra Data Services Platform
https://environment.data.gov.uk/explore/38946802-13a2-4d80-8486-742eccff191d?download=true
protocol: http
name: WWNPRunoffAttenuationFeatures33AEP_Download
description: Download data by area of interest
https://environment.data.gov.uk/spatialdata/wwnp-runoff-attenuation-features-3-3-percent-aep/wfs
protocol: http
name: WWNPRunoffAttenuationFeatures33AEP_WFS
description: WWNP Runoff Attenuation Features 3.3% AEP WFS
https://environment.data.gov.uk/spatialdata/wwnp-runoff-attenuation-features-3-3-percent-aep/wms
protocol: http
name: WWNPRunoffAttenuationFeatures33AEP_WMS
description: WWNP Runoff Attenuation Features 3.3% AEP WMS
http://www.arcgis.com/home/item.html?id=002ab2caeb654d6082ce58037aa98a61
protocol: http
name: ArcGIS Online Feature Service
description: ArcGIS Online Feature Service
http://www.arcgis.com/home/item.html?id=80afec3a97864136852f657984322eda
protocol: http
name: ArcGIS Online Tile Service
description: ArcGIS Online Tile Service
38946802-13a2-4d80-8486-742eccff191d
eng
http://www.opengis.net/def/crs/EPSG/0/27700
environment
environment
flood
publication
2010-01-13
natural environment
publication
2010-01-13
-6.236
2.072
55.816
49.943
2017-09-01
2030-01-01
creation
2017-09-01
asNeeded
A GIS tool developed by JBA, called JRAFF (JBA Runoff Attenuation Feature Finder) was used to analyse potential for Runoff Attenuation Features. This identifies areas of high flow accumulation from the Risk of Flooding from Surface Water Depth 3.3 percent annual chance map that could be targeted as opportunities for enhanced temporary storage. OS Terrain 50 (2016) was used to determine gully blocking potential, based on a threshold of > 6 degrees (10%). A constraint layer was applied based on CORINE Land Cover Urban layer (2012), OS Open Map Local – Roads, Rail and Building layers (2016) and OS Open Rivers – Canal layer (2016).
Proprietary format | ESRI File based Geodatabase (GDB)
10.x
Open Government Licence
There are no public access constraints to this data. Use of this data is subject to the licence identified.
There are no public access constraints to this data. Use of this data is subject to the licence identified.
Environment Agency
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https://environment.data.gov.uk/support
description: Defra Data Services Forum
pointOfContact
Environment Agency
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pointOfContact
2024-01-02