Editing Catbrain (section)

==Hazel Brook==
The [[Hazel Brook]] rises in nearby Cribbs Causeway and its flow into the [[River Trym]] is controlled by an attenuation reservoir at Catbrain, which reduces the silt flowing into the system from the many shopping malls in the area.<ref name=monitoring>{{cite web
|url=http://www.bristol.gov.uk/ccm/content/Environment-Planning/Pollution/bristol-living-rivers--watercourses.en?page=3
|title=Waterways Monitoring: River Trym and Hazel Brook
|publisher=Bristol City Council
|accessdate=24 November 2009
|archive-url=https://web.archive.org/web/20110520045642/http://www.bristol.gov.uk/ccm/content/Environment-Planning/Pollution/bristol-living-rivers--watercourses.en?page=3
|archive-date=20 May 2011
|url-status=dead
}}</ref> Measurements of pollution by the city council are made monthly.<ref>{{cite web |url=https://www.google.com/maps/d/u/0/viewer?hl=en&ie=UTF8&msa=0&ll=51.463846999999994%2C-2.5797270000000094&spn=0.190364%2C0.44014&t=h&z=11&mid=1Ia9tyxgZiw-VvZEaQ6rZVLZ3DRA |title=Bristol City Council River Monitoring Locations |author=Bristol City Council |accessdate=2021-01-08 }}</ref>