What is Wimbleball Lake?
{{Infobox lake | lake_name = Wimbleball Lake | image_lake = Wimbleballdam.jpg | caption_lake = The Dam | image_bathymetry = | caption_bathymetry = | location = [[Somerset]] | coords = {{coord|51|04|N|3|28|W|region:GB_type:waterbody_source:GNS-enwiki|display=inline,title}} | type = [[reservoir]] | inflow = [[River Haddeo]] | outflow = [[River Haddeo]] | catchment = | basin_countries = United Kingdom | length = | width = | area = {{convert|374|acre|km2}} | depth = {{convert|50|m|ft}} | max-depth = | volume = 21,000 megalitres | residence_time = | shore = | elevation = | islands = | cities = }} [[File:Wimbleball lake.JPG|thumb|The view from the sailing club]] '''Wimbleball Lake''' is in [[Exmoor]] [[National Park]] in [[Somerset]], England. It is used as a water supply [[reservoir]], built in the 1970s and completed in 1979. Wimbleball Lake was nominated to be the first [[Dark Skies Discovery Site]] on Exmoor.<ref>{{Cite web |url=http://www.darkskydiscovery.org.uk/dark-sky-discovery-sites/map.html |title=Dark sky discovery |access-date=2014-04-27 |archive-date=2017-11-10 |archive-url=https://web.archive.org/web/20171110012420/http://www.darkskydiscovery.org.uk/dark-sky-discovery-sites/map.html |url-status=dead }}</ref> [[Exmoor National Park]] has been designated an [[International Dark Sky Reserve]], the first place in Europe to achieve this award and only the second in the world.<ref name=Wimble>Wimbleball Lake Country Park. [http://www.swlakestrust.org.uk/lakes-and-facilities/the-lakes/wimbleball-lake] {{Webarchive|url=https://web.archive.org/web/20140411080940/http://www.swlakestrust.org.uk/lakes-and-facilities/the-lakes/wimbleball-lake |date=2014-04-11 }}</ref> The {{convert|161|ft|m|0}} high [[dam]] is a [[concrete]] [[buttress]] which holds back the [[River Haddeo]]. It has a water storage capacity of 21,000 megalitres over {{convert|374|acre|km2}}. At times of low flow in the [[River Exe]], water is released into the river for taking out downstream at [[Tiverton, Devon|Tiverton]] and [[Exeter]]. The effec