Case study:Afon Clywdd - Revision history

Alexrrc at 12:30, 8 November 2018

2018-11-08T12:30:20Z

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			\|Other technical measure=Runoff pathway management,
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Alexrrc at 12:30, 8 November 2018

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			\|Specific mitigation=Flood risk management,
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Alexrrc at 12:21, 8 November 2018

2018-11-08T12:21:30Z

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	{{Case study subcatchment}}		{{Case study subcatchment}}
	{{Site}}		{{Site
			\|Name=Afon Clywdd
			\|Heavily modified water body=No
			\|Protected species present=No
			\|Invasive species present=No
			}}
	{{Project background}}		{{Project background}}
	{{Motivations}}		{{Motivations}}

Alexrrc at 12:20, 8 November 2018

2018-11-08T12:20:53Z

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	{{Project overview		{{Project overview
	~~\|Project title=Afon Clywdd~~
	\|Status=Planned		\|Status=Planned
			\|Project web site url=www.therrc.co.uk/sites/default/files/projects/40_afonclwyd.pdf
	\|Themes=Flood risk management, Habitat and biodiversity, Land use management - agriculture, Land use management - forestry, Water quality		\|Themes=Flood risk management, Habitat and biodiversity, Land use management - agriculture, Land use management - forestry, Water quality
	\|Country=Wales		\|Country=Wales
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	\|Main contact surname=Sisson		\|Main contact surname=Sisson
	\|Contact organisation=Natural Resources Wales		\|Contact organisation=Natural Resources Wales
			\|Contact organisation url=naturalresources.wales/?lang=en
			\|Partner organisations=AECOM,
	\|Multi-site=No		\|Multi-site=No
			\|Project picture=40 Afon Clywdd.png
			\|Project summary=The Clwyd (Photo 1 and Map 1) is a large catchment in north-east Wales, discharging north into the Irish Sea. The confluence of the Afon Clwyd with the Afon Elwy is downstream of St Asaph, which in November 2012 was subject to severe flooding resulting in a fatality. The impact of flooding from the Afon Elwy, which flows through the town, was exacerbated by the backing up of flow at the confluence with the Afon Clwyd, which was also in spate.
			In 2015, Natural Resources Wales commissioned AECOM Consultants to identify potential Working with Natural Processes (WWNP) in the Elwy catchment which would provide climate resilience to the proposed improvements to engineered flood defences in St Asaph (AECOM Consultants 2015). Following the study, AECOM wanted to develop techniques for rapid assessment of WWNP that could be applied to different types of catchments. AECOM used EU innovation funding to test techniques in a number of catchments, including this study of potential WWNP in the Vale of Clwyd.
			A systematic review of the aerial imagery, Ordnance Survey (OS) mapping and flood zone/flood extent information was carried out to identify the most important morphological features in the catchment and to identify locations where the WWNP measures could potentially be implemented across the catchment. In contrast to the Elwy, the identification process included an assessment of implementation and shortlisting to streamline the process.
			The overall impact of the modelled WWNP is a reduction in peak flow and an increase in time-to-peak (TP). Peak flow reduction was approximately 6% for the 5-year design event and approximately 1% for the 200-year design event.
			\|Project title=Afon Clywdd
	}}		}}
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Alexrrc: Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=53.1827018, -3.3687664999999924 }} {{Project overview |Project title=Afon Clywdd |Status=Planned |Themes=Flo..."

2018-11-08T12:17:45Z

Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=53.1827018, -3.3687664999999924 }} {{Project overview |Project title=Afon Clywdd |Status=Planned |Themes=Flo..."

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{{Case study status
|Approval status=Draft
}}
{{Location
|Location=53.1827018, -3.3687664999999924
}}
{{Project overview
|Project title=Afon Clywdd
|Status=Planned
|Themes=Flood risk management, Habitat and biodiversity, Land use management - agriculture, Land use management - forestry, Water quality
|Country=Wales
|Main contact forename=Jacques
|Main contact surname=Sisson
|Contact organisation=Natural Resources Wales
|Multi-site=No
}}
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{{Motivations}}
{{Measures}}
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{{Additional Documents}}
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{{Supplementary Information}}
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