River Alwin
{{Short description|River in Northumberland, England}}
{{Use dmy dates|date=April 2022}}
{{Infobox river
| name = River Alwin
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| image = River Alwin near Clennell - geograph.org.uk - 465966.jpg
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| image_caption = River Alwin near Clennell
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| pushpin_map = United Kingdom Northumberland
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| pushpin_map_caption= Location within Northumberland
| subdivision_type1 = Country
| subdivision_name1 = United Kingdom
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| subdivision_type3 = County
| subdivision_name3 = Northumberland
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| discharge1_location= Clennell, Northumberland
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| discharge1_avg = {{convert|0.57|m3/s|cuft/s|abbr=on}}
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| mouth_coordinates = {{coord|55.3451|-2.1257|display=inline,title}}
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| basin_size = {{convert|33.5|km2|abbr=on}}
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The River Alwin is a short, steep upland river that drains the Kidland Forest on the southern flanks of the Cheviot Hills, in the Northumberland National Park, England. It is a tributary of the River Coquet and {{convert|4.3|km|disp=flip}} in length.{{cite book
| url= http://ea-lit.freshwaterlife.org/archive/ealit%3A2133/-/The%20quality%20of%20rivers%20and%20estuaries%20in%20Northumbria%20region%201990
|title= The quality of rivers and estuaries in Northumbria region 1990
|page=10
| quote= Allerhope Burn to Coquet 4.3 km
|last = National Rivers Authority
|year=1990
|publisher=National Rivers Authority: Northumbria Region}}
Course
Rising as the Outer Sike at the edge of the Kidland Forest between the peaks of Yarnspath Law and Bloodybush edge. It flows south through the forest gaining various burns and cloughs, to become the White Burn, until it reaches the confluence of the Yoke Burn, where it forms the River Alwin to the north of Kidlandlee.{{cite web|title=River Alwin|url= http://environment.data.gov.uk/catchment-planning/WaterBody/GB103022076770|website=Catchment Data Explorer|publisher=Environment Agency |accessdate=17 December 2015}}
From this point the river flows south to collect the Allerhope Burn at the edge of the forest, continuing through a steep sided valley before reaching Clennell Hall. It then passes to the south of Alwinton, finally reaching the hamlet of Low Alwinton where it joins the Coquet.
Hydrology
Between 1969 and 1983 the flow of the Alwin, was measured in its lower reaches at a weir near Clennel. The fourteen year record shows that the catchment of {{convert|28|km2}} to the gauging station yielded an average flow of {{convert|0.57|m3/s}}.{{cite web |url=http://nrfa.ceh.ac.uk/data/station/info/22008 |title=22008 - Alwin at Clennell Station Information |work= National Rivers Flow Archive |publisher=Centre for Ecology & Hydrology|accessdate=17 December 2015 }}{{cite web |url=http://nrfa.ceh.ac.uk/data/station/meanflow/22008 |title=22008 - Alwin at Clennell Daily Flow Data| work=National Rivers Flow Archive |publisher=Centre for Ecology & Hydrology |accessdate= 17 December 2015}}
The catchment upstream of the station has an average annual rainfall of {{convert|1003|mm}} and a maximum altitude of {{convert|615|m}} at Cushat Law. Land use is mostly forest with more than half of the catchment consisting of woodland, the remainder is grassland and moorland.{{cite web|url=http://nrfa.ceh.ac.uk/data/station/spatial/22008 |title=22008 - Alwin at Clennell Spatial data |work= National Rivers Flow Archive |publisher=Centre for Ecology & Hydrology|accessdate=17 December 2015 }}
The River Alwin has been classed as having good ecological quality under the Water Framework Directive. This is one of the upper bands in the five part framework scale, which ranges from high, good, and moderate, through to poor and finally bad.
See also
References
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