The '''Hazel Brook''', also known as the '''Hen''',<ref>{{cite web |title=The Big Blue Map of Bristol |url=httphttps://www.bristol.gov.uk/ccmdocuments/content20182/Environment-Planning/Pollution239329/reportingbig-waterblue-pollutionmap-of-bristol.en?page=2 |title=Bristol Living Rivers Project pdf/0267cde0- Waterways dc2b-4aef-8fe6- Pollution4f03cca8c1f6 |publisher=Bristol City Council |accessdate=2629 November 2009August 2018}}</ref><ref>{{deadcite web link|datetitle=OctoberThe 2017river Hen and Hazel Brook |boturl=InternetArchiveBothttps://greendragontavern.co/the-rivers/the-river-hen/ |fix-attemptedpublisher=yesThe Name of the Green Dragon |accessdate=29 August 2018}}</ref> is a tributary of the [[River Trym]] in [[Bristol]], [[England]]. It rises at [[Cribbs Causeway]] in [[South Gloucestershire]]. From there, its course takes it south, passing the western end of [[Bristol Filton Airport|Filton Aerodrome]] on its left bank, through [[Brentry]] and [[Henbury]] before dropping through a steep limestone gorge in the [[Blaise Castle]] estate. It continues south through two lakes before joining the Trym at [[Coombe Dingle]].<ref>{{cite web |last1=Plaster |first1=Andrew |title=Henbury |url=http://www.bafhs.org.uk/32-copy/news/458-henbury |publisher=Bristol & Avon Family History Society |accessdate=29 August 2018}}</ref><ref>{{cite web |title=Visit to the South-West, Thursday 13th/Friday 14th January 2000 |url=https://publications.parliament.uk/pa/cm199900/cmselect/cmenvtra/34/3416.htm |publisher=Parliament |accessdate=29 August 2018}}</ref>
== Hydrology ==
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</ref> Measurements of pollution by the city council show the water to be relatively clean.<ref>{{cite web |title=Rivers and Rhines |url=https://www.bristol.gov.uk/documents/20182/35052/rivers_and_rhines.pdf/583649fe-4ccf-4035-b8e2-d29f70a3b374 |publisher=Bristol City Council |accessdate=29 August 2018}}</ref><ref>{{cite web |title=Trym - source to conf R Avon (Brist) |url=http://environment.data.gov.uk/catchment-planning/WaterBody/GB109053027530 |publisher=Environment Agency |accessdate=29 August 2018}}</ref>
</ref> Measurements of pollution by the city council show the water to be relatively clean.<ref name=september-results>
