GeoNodeFeatureCatalogue
Generic Feature Catalogue
Generic Feature Catalogue
1.0
2016-01-11
DataMapWales
pointOfContact
geonode:pmfnfm_small_catchments_env_weighting
<p>This dataset comprises of a prioritisation method, with a weighting towards ecosystem service provision, for identifying small catchments, above communities at risk from frequent surface water and small watercourse flooding where Natural Flood Management (NFM) may be a suitable means of reducing flood risk and may also provide additional environmental benefits. The dataset can be used to support the identification of areas suitable for NFM alongside other analyses undertaken by a suitably qualified person.</p>
<p>The information provided is based on a national scale mapping approach, taking into account largely modelled and open-source data, therefore this mapping should be viewed as indicative rather than specific. Locations identified may have more recent building or land use than available data indicates. It is important to note that land ownership and change to flood risk have not been considered.</p>
<p>The principles behind this prioritisation were inform by current academic understanding of where NFM may be most applicable and has sought to use the latest <a title="Natural Environment Research Council (NERC) research" href="https://research.reading.ac.uk/nerc-nfm/" target="_blank" rel="noopener"><span style="color: #236fa1;"><strong>Natural Environment Research Council (NERC) research</strong></span></a>. NFM has been shown to work at catchment scales up to 10km2 where the community at risk is immediately downstream. The catchments have been delineated using <strong>OpenPopGrid, </strong>a grid-based estimation of population density and the <a title="Flood Risk Assessment Wales (FRAW)" href="/layergroups/inspire-nrw:FloodRiskAssessmentWales" target="_blank" rel="noopener"><span style="color: #236fa1;"><strong>Flood Risk Assessment Wales (FRAW)</strong></span></a> surface water flood map to identify small communities at risk from frequent flooding.</p>
<p>These small catchments above communities at risk from frequent flooding are prioritised based on the percentage area of NFM potential as identified in two mapping sources, the Working with Natural Processes (WwNP) potential area maps and the System Cynorthwyo Cunllunio Adnoddau Naturiol (SCCAN) maps. The potential for the following features was summarised in the prioritisation:</p>
<ul>
<li>Runoff attenuation features (WwNP)</li>
<li>Floodplain reconnection potential (WwNP)</li>
<li>Riparian Woodland (WwNP)</li>
<li>Infiltration improvements on slowly permeable soils (WwNP)</li>
<li>Hedgerows (SCCAN)</li>
<li>Bog restoration (SCCAN)</li>
<li>Habitat change and improvements for increased surface roughness (SCCAN)</li>
<li>Agricultural management through the retention of winter stubbles (SCCAN)</li>
</ul>
<p>The following features were given a double weighting for potential ecosystem service provision based on an analysis of the WwNP Evidence Directory:</p>
<ul>
<li>Riparian Woodland (WwNP)</li>
<li>Infiltration improvements on slowly permeable soils (WwNP)</li>
<li>Hedgerows (SCCAN)</li>
<li>Bog restoration (SCCAN)</li>
</ul>
<p>The catchments have been categorised based on the percentage area of NFM potential of:</p>
<ul>
<li><10%</li>
<li>10%-25%</li>
<li>25%-50%</li>
<li>>50%</li>
</ul>
false
NFM Prioritisation for Small Flood Risk Catchments with weighting for ecosystem service provision.
id
1
1
xsd:int
catcharea
1
1
xsd:double
brarea
1
1
xsd:long
brclarea
1
1
xsd:long
spsarea
1
1
xsd:long
rwarea
1
1
xsd:long
hrarea
1
1
xsd:long
hcarea
1
1
xsd:long
hiarea
1
1
xsd:long
wsarea
1
1
xsd:long
froparea
1
1
xsd:long
rafarea
1
1
xsd:long
allnfmarea
1
1
xsd:long
allnfmper
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1
xsd:double
dbl_br_a
1
1
xsd:long
dbl_brcl_a
1
1
xsd:long
dbl_sps_a
1
1
xsd:long
dbl_rw_a
1
1
xsd:long
dbl_hr_a
1
1
xsd:long
w_allnfm_a
1
1
xsd:long
w_allnfm_p
1
1
xsd:double
geom
1
1
gml:PolygonPropertyType