Identification

Title

WWNP Runoff Attenuation Features 1% AEP

Alternative title(s)

Working With Natural Processes Runoff Attenuation Features 1% AEP

Abstract

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 where 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 1% 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.

Resource type

dataset

Resource locator

https://environment.data.gov.uk/DefraDataDownload/?mapService=EA/WWNPRunoffAttenuationFeatures1AEP&Mode=spatial

protocol: DSP:ESRI

description: WWNP Runoff Attenuation Features 1% AEP Download

https://environment.data.gov.uk/spatialdata/wwnp-runoff-attenuation-features-1-percent-aep/wfs

protocol: WFS

description: WWNP Runoff Attenuation Features 1% AEP WFS

https://environment.data.gov.uk/spatialdata/wwnp-runoff-attenuation-features-1-percent-aep/wms

protocol: WMS

description: WWNP Runoff Attenuation Features 1% AEP WMS

https://support.environment.data.gov.uk/hc/en-gb

protocol: http:

description: DEFRA Data Services Platform Customer Forum

http://www.arcgis.com/home/item.html?id=a085f1eaedcd4b4ba0d57f99a46aa7ad

protocol: WWW:LINK-1.0-http--link

description: ArcGIS Online Feature Service

http://www.arcgis.com/home/item.html?id=b1febc32367e426ebf45d38467eba5d7

protocol: WWW:LINK-1.0-http--link

description: ArcGIS Online Tile Service

Unique resource identifier

code

fc69965f-684f-463d-b7c9-2471a5d49741

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

http://www.opengis.net/def/crs/EPSG/0/27700

Classification of spatial data and services

Topic category

environment

Keywords

Keyword set

keyword value

OpenData

EAbatch2

Keyword set

keyword value

natural environment

flood

originating controlled vocabulary

title

GEMET - Concepts, version 2.4

reference date

date type

publication

effective date

2010-01-13

Geographic location

West bounding longitude

-6.236

East bounding longitude

2.072

North bounding latitude

55.816

South bounding latitude

49.943

Extent

Extent group

authority code

code identifying the extent

http://data.ordnancesurvey.co.uk/doc/country/england

Temporal reference

Temporal extent

Begin position

2017-09-01

End position

2030-01-01

Dataset reference date

date type

creation

effective date

2017-09-01

Frequency of update

asNeeded

Quality and validity

Lineage

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 1 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).

Conformity

Data format

name of format

Proprietary format | ESRI File based Geodatabase (GDB)

version of format

10.x

Constraints related to access and use

Constraint set

Use constraints

Open Government Licence

Constraint set

Limitations on public access

There are no public access constraints to this data. Use of this data is subject to the licence identified.

Responsible organisations

Responsible party

organisation name

Environment Agency

email address

DSPcustomerforum@environment-agency.gov.uk

web address

https://support.environment.data.gov.uk/hc/en-gb

description: Defra Data Services Forum

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

Environment Agency

email address

metadata@environment-agency.gov.uk

responsible party role

pointOfContact

Metadata date

2021-06-23

Metadata language

eng