Scour test schedule

Scour tests must be routinely carried out on reservoirs to make sure they can be lowered in an emergency.

View over Baitings Reservoir

A scour test involves slowly opening and closing the outlet valve, which causes the release of water into the stream. This is likely to cause increased turbulence and deterioration of water quality immediately downstream for the duration of the test and for a short while after.

On the day, tests generally commence between 7-10am and may last for up to 4 hours in total, with a release at full flow rate for about half an hour. If you might be affected by a particular test, please check a week beforehand as there is a small chance for test dates to be moved to a later date or for additional tests to be required.

Aire

Aire
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
LOWER LAITHE/IRE 13/01/2022 Sladen Beck
STUBDEN/IRE 18/01/2022 Stubden Beck
THORNTON MOOR/IRE 18/01/2022 Stubden Beck
LEEMING/IRE 25/01/2022 Leeming Water
LEESHAW/IRE 25/01/2022 Dunkirk Beck
KEIGHLEY MOOR/IRE 03/02/2022 Morkin Beck
PONDEN/IRE 15/02/2022 River Worth
LOWER LAITHE/IRE 17/02/2022 Sladen Beck
EMBSAY/IRE 22/02/2022 Embsay Beck
WEECHER/IRE 03/03/2022 Gill Beck
SILSDEN/IRE 17/03/2022 Silsden Beck
HEWENDEN/IRE 29/03/2022 Hewenden Beck
WATER SHEDDLES/IRE 31/03/2022 River Worth
ELDWICK/IRE 05/04/2022 Eldwick Beck
GRAINCLIFFE/IRE 05/04/2022 Eldwick Beck
ELSLACK/IRE 12/04/2022 Elslack Beck
WHINNY GILL/IRE 12/04/2022 Little Brook
FARNLEY STORM/SLK 29/04/2022 Wortley Beck
REVA/IRE 03/05/2022 Jum Beck
WINDLEDEN LOWER/IRE 03/05/2022 Embsay Beck
DOE PARK/IRE 10/05/2022 Denholme Beck
GILSTEAD/ESR 07/06/2022 Little Beck
LOWER LAITHE/IRE 07/07/2022 Sladen Beck
LEEMING/IRE 21/07/2022 Leeming Water
LEESHAW/IRE 21/07/2022 Dunkirk Beck
KEIGHLEY MOOR/IRE 26/07/2022 Morkin Beck
WEECHER/IRE 23/08/2022 Gill Beck
EMBSAY/IRE 25/08/2022 Embsay Beck
STUBDEN/IRE 06/09/2022 Stubden Beck
THORNTON MOOR/IRE 06/09/2022 Stubden Beck
HEWENDEN/IRE 27/09/2022 Hewenden Beck
ELSLACK/IRE 04/10/2022 Elslack Beck
WHINNY GILL/IRE 04/10/2022 Little Brook
REVA/IRE 06/10/2022 Jum Beck
ELDWICK/IRE 11/10/2022 Eldwick Beck
GRAINCLIFFE/IRE 11/10/2022 Eldwick Beck
WATER SHEDDLES/IRE 13/10/2022 River Worth
PONDEN/IRE 18/10/2022 River Worth
GILSTEAD/ESR 01/11/2022 Little Beck
DOE PARK/IRE 03/11/2022 Denholme Beck
SILSDEN/IRE 15/11/2022 Silsden Beck

Calder

Upper Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
WALSHAW DEAN MIDDLE/IRE 01/02/2022 Walshaw Dean Lower
WALSHAW DEAN UPPER/IRE 01/02/2022 Walshaw Dean Middle
WALSHAW DEAN LOWER/IRE 01/03/2022 Hebden Stream
GORPLE LOWER/IRE 15/03/2022 Hebden Stream
GORPLE UPPER/IRE 15/03/2022 Gorple Lower
GORPLEY/IRE 05/04/2022 Gorpley Clough
WIDDOP/IRE 19/04/2022 Hebden Stream
GORPLE LOWER/IRE 25/08/2022 Hebden Stream
GORPLE UPPER/IRE 25/08/2022 Gorple Lower
WALSHAW DEAN MIDDLE/IRE 30/08/2022 Walshaw Dean Lower
WALSHAW DEAN UPPER/IRE 30/08/2022 Walshaw Dean Middle
WALSHAW DEAN LOWER/IRE 20/09/2022 Hebden Stream
GORPLEY/IRE 04/10/2022 Gorpley Clough
WIDDOP/IRE 06/10/2022 Hebden Stream
Middle Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
MIXENDEN/IRE 27/01/2022 Hebble Brook
OGDEN/IRE 27/01/2022 Hebble Brook
DEANHEAD/IRE 24/02/2022 Black Burne Brook
SCAMMONDEN/IRE 24/02/2022 Black Brook
ALBERT/ESR 08/03/2022 To Sewer
RAMSDEN WOOD/ESR 08/03/2022 To Sewer
RYBURN/IRE 17/03/2022 River Ryburn
DEAN HEAD LOWER/IRE 29/03/2022 Luddenden Dean
DEAN HEAD UPPER/IRE 29/03/2022 Luddenden Dean
WARLEY MOOR/IRE 29/03/2022 Deanhead Upper
WITHENS CLOUGH/IRE 31/03/2022 Turvin Clough
BAITINGS/IRE 07/04/2022 River Ryburn
GREEN WITHENS/IRE 14/04/2022 Booth Dean
SPA CLOUGH/ESR 14/04/2022 Spa Clough
BOOTH DEAN LOWER/IRE 26/04/2022 Boothwood IRE
BOOTH DEAN UPPER/IRE 26/04/2022 Boothdean Lower IRE
BOOTH WOOD/IRE 26/04/2022 Booth Dean Clough
RINGSTONE/IRE 07/06/2022 Butts Clough
MIXENDEN/IRE 21/07/2022 Hebble Brook
OGDEN/IRE 21/07/2022 Hebble Brook
RYBURN/IRE 02/08/2022 River Ryburn
BAITINGS/IRE 15/09/2022 River Ryburn
GREEN WITHENS/IRE 22/09/2022 Booth Dean
SPA CLOUGH/ESR 22/09/2022 Spa Clough
BOOTH DEAN LOWER/IRE 27/09/2022 Boothwood IRE
BOOTH DEAN UPPER/IRE 27/09/2022 Boothdean Lower IRE
BOOTH WOOD/IRE 27/09/2022 Booth Dean Clough
DEAN HEAD LOWER/IRE 11/10/2022 Luddenden Dean
DEAN HEAD UPPER/IRE 11/10/2022 Luddenden Dean
WARLEY MOOR/IRE 11/10/2022 Deanhead Upper
DEANHEAD/IRE 13/10/2022 Black Burne Brook
SCAMMONDEN/IRE 13/10/2022 Black Brook
ALBERT/ESR 18/10/2022 To Sewer
RAMSDEN WOOD/ESR 18/10/2022 To Sewer
WITHENS CLOUGH/IRE 01/11/2022 Turvin Clough
RINGSTONE/IRE 22/11/2022 Butts Clough
Lower Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
WHITLEY/ESR 24/03/2022 Whitley Wood
ARDSLEY/ESR 21/04/2022 Haigh Moor Beck
ARDSLEY/ESR 29/09/2022 Haigh Moor Beck
WHITLEY/ESR 20/10/2022 Whitley Wood

Colne & Holme

Colne & Holme
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BLAKELEY/IRE 04/01/2022 Butterley IRE
BUTTERLEY/IRE 04/01/2022 Wessenden Brook
BOSHAW WHAMS/IRE 01/02/2022 Upper House Dyke
HOLMESTYES/IRE 01/02/2022 River Ribble
BILBERRY/IRE 03/02/2022 Digley IRE
DIGLEY/IRE 03/02/2022 Digley Brook
LONGWOOD COMP/IRE 17/02/2022 Longwood Brook
LONGWOOD/ESR 17/02/2022 Longwood Brook
RIDING WOOD/IRE 22/02/2022 Ramsden IRE
YATEHOLME/IRE 22/02/2022 Netherley Clough
BLACKMOORFOOT/IRE (NORTH SIDE) 03/03/2022 Brow Grains Dyke
DEERHILL/IRE 03/03/2022 Bradley Brook
BROWNHILL/IRE 28/04/2022 River Holme
RAMSDEN/IRE 28/04/2022 Brownhill IRE
WESSENDEN HEAD/IRE 09/06/2022 Wessenden Brook
WESSENDEN OLD/IRE 09/06/2022 Blakeley IRE
SNAILSDEN/IRE 14/06/2022 Harden Beck
BLAKELEY/IRE 16/06/2022 Butterley IRE
BUTTERLEY/IRE 16/06/2022 Wessenden Brook
BOSHAW WHAMS/IRE 18/08/2022 Upper House Dyke
HOLMESTYES/IRE 18/08/2022 River Ribble
LONGWOOD COMP/IRE 25/10/2022 Longwood Brook
LONGWOOD/ESR 25/10/2022 Longwood Brook
RIDING WOOD/IRE 27/10/2022 Ramsden IRE
YATEHOLME/IRE 27/10/2022 Netherley Clough
BLACKMOORFOOT/IRE (NORTH SIDE) 03/11/2022 Brow Grains Dyke
DEERHILL/IRE 03/11/2022 Bradley Brook
BILBERRY/IRE 08/11/2022 Digley IRE
DIGLEY/IRE 08/11/2022 Digley Brook
BROWNHILL/IRE 15/11/2022 River Holme
RAMSDEN/IRE 15/11/2022 Brownhill IRE
WESSENDEN HEAD/IRE 24/11/2022 Wessenden Brook
WESSENDEN OLD/IRE 24/11/2022 Blakeley IRE
SNAILSDEN/IRE 01/12/2022 Harden Beck

Derwent

Derwent
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
ELVINGTON/NO 1 ESR 09/03/2022 River Derwent
LOFTSOME BRIDGE/ESR 12/05/2022 River Derwent
TOPHILL LOW/NO 1 ESR 18/05/2022 River Hull
TOPHILL LOW/NO 2 ESR 18/05/2022 Barmston Drain
ELVINGTON/NO 1 ESR 21/09/2022 River Derwent
LOFTSOME BRIDGE/ESR 10/11/2022 River Derwent
TOPHILL LOW/NO 1 ESR 16/11/2022 River Hull
TOPHILL LOW/NO 2 ESR 16/11/2022 Barmston Drain

Don

Upper Don
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BROADSTONES/ESR 06/01/2022 Broadstones Dike
AGDEN/IRE 20/01/2022 Agden Beck
DALE DIKE/IRE 25/01/2022 River Loxley
RIVELIN LOWER/IRE 27/01/2022 River Rivelin
DAMFLASK/IRE 03/02/2022 River Loxley
RIVELIN UPPER/IRE 08/02/2022 Rivelin Lower IRE
RIVELIN/DEP POND IRE 08/02/2022 River Rivelin
REDMIRES LOWER/IRE 10/02/2022 Wyming Brook
REDMIRES MIDDLE/IRE 10/02/2022 Redmires Lower IRE
REDMIRES UPPER/IRE 10/02/2022 Redmires Middle IRE
BROOMHEAD/IRE 15/02/2022 Morehall IRE
UNDERBANK/IRE 17/02/2022 River Little Don
MOREHALL/IRE 03/03/2022 Ewden Beck
INGBIRCHWORTH/IRE 08/03/2022 Ingbirchworth Dike
SCOUT DIKE/IRE 10/03/2022 River Don
ROYD MOOR/IRE 31/03/2022 River Don
STRINES/IRE 05/04/2022 Dale Dike IRE
WINDLEDEN UPPER/IRE 03/05/2022 Windleden Lower IRE
WINSCAR/IRE 12/05/2022 River Don
MIDHOPE/IRE 07/06/2022 River Little Don
LANGSETT/IRE 09/06/2022 River Little Don
HARDEN/IRE 14/06/2022 Winscar IRE
BROADSTONES/ESR 16/06/2022 Broadstones Dike
AGDEN/IRE 21/06/2022 Agden Beck
DALE DIKE/IRE 23/06/2022 River Loxley
RIVELIN LOWER/IRE 21/07/2022 River Rivelin
DAMFLASK/IRE 02/08/2022 River Loxley
RIVELIN UPPER/IRE 04/08/2022 Rivelin Lower IRE
RIVELIN/DEP POND IRE 04/08/2022 River Rivelin
REDMIRES LOWER/IRE 11/08/2022 Wyming Brook
REDMIRES MIDDLE/IRE 11/08/2022 Redmires Lower IRE
REDMIRES UPPER/IRE 11/08/2022 Redmires Middle IRE
MOREHALL/IRE 06/09/2022 Ewden Beck
STRINES/IRE 04/10/2022 Dale Dike IRE
WINSCAR/IRE 11/10/2022 River Don
UNDERBANK/IRE 18/10/2022 River Little Don
WINDLEDEN LOWER/IRE 27/10/2022 Clough Beck
WINDLEDEN UPPER/IRE 27/10/2022 Windleden Lower IRE
ROYD MOOR/IRE 01/11/2022 River Don
INGBIRCHWORTH/IRE 08/11/2022 Ingbirchworth Dike
SCOUT DIKE/IRE 10/11/2022 River Don
MIDHOPE/IRE 24/11/2022 River Little Don
HARDEN/IRE 01/12/2022 Winscar IRE
BROOMHEAD/IRE 06/12/2022 Morehall IRE
LANGSETT/IRE 08/12/2022 River Little Don

Esk

Esk
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
RANDY MERE/ESR 16/06/2022 Oakley Beck
RANDY MERE/ESR 08/12/2022 Oakley Beck

Hull

Lower Hull
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BRANSHOLME/SLK 18/01/2022 River Hull
BRANSHOLME/SLK 20/07/2022 River Hull

Nidd

Nidd
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
GOUTHWAITE/IRE 24/02/2022 River Nidd
ANGRAM/IRE 08/03/2022 Scar House IRE
SCAR HOUSE/IRE 08/03/2022 River Nidd
SCARGILL/IRE 12/04/2022 Oak Beck
JOHN O GAUNTS/IRE 31/05/2022 Oak Beck
GOUTHWAITE/IRE 28/07/2022 River Nidd
ANGRAM/IRE 01/09/2022 Scar House IRE
SCAR HOUSE/IRE 01/09/2022 River Nidd
SCARGILL/IRE 25/10/2022 Oak Beck
JOHN O GAUNTS/IRE 22/11/2022 Oak Beck

Ouse

Upper Ouse
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
CLIFTON LAKE/SLK 15/09/2022 Drain

Swale

Middle & Lower Swale
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
COD BECK/IRE 08/02/2022 Cod Beck
THORNTON STEWARD/ESR 10/03/2022 Finghall Beck
THORNTON STEWARD/ESR 27/10/2022 Finghall Beck
COD BECK/IRE 01/11/2022 Cod Beck

Ure

Middle & Lower Ure
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
LUMLEY MOOR/IRE 17/02/2022 Holborn Beck
LEIGHTON/IRE 05/04/2022 River Burn
ROUNDHILL/IRE 07/04/2022 Leighton IRE
LEIGHTON/IRE 27/09/2022 River Burn
ROUNDHILL/IRE 29/09/2022 Leighton IRE
LUMLEY MOOR/IRE 15/11/2022 Holborn Beck

Wharfe & Washburn

Wharfe & Washburn
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BARDEN LOWER/IRE 04/01/2022 Barden Beck
CHELKER/IRE 06/01/2022 Bank Gill Beck
FEWSTON/IRE 06/01/2022 Swinsty IRE
BARDEN UPPER/IRE 11/01/2022 Barden Beck
MARCH GHYLL/IRE 20/01/2022 Bow Beck
THRUSCROSS/IRE 03/02/2022 River Washburn
ECCUP/ESR 01/03/2022 Eccup Beck, Harewood Estate Ponds, River Wharfe
SWINSTY/IRE 03/03/2022 River Washburn
GRIMWITH/IRE 15/03/2022 River Dibb
LINDLEY WOOD/IRE 24/03/2022 River Washburn
CARR BOTTOM/IRE 07/04/2022 Carr Beck
PANORAMA/IRE 07/04/2022 Black Beck
BARDEN LOWER/IRE 23/06/2022 Barden Beck
BARDEN UPPER/IRE 28/06/2022 Barden Beck
CHELKER/IRE 05/07/2022 Bank Gill Beck
MARCH GHYLL/IRE 19/07/2022 Bow Beck
FEWSTON/IRE 21/07/2022 Swinsty IRE
SWINSTY/IRE 01/09/2022 River Washburn
THRUSCROSS/IRE 15/09/2022 River Washburn
CARR BOTTOM/IRE 20/09/2022 Carr Beck
PANORAMA/IRE 20/09/2022 Black Beck
GRIMWITH/IRE 03/11/2022 River Dibb
ECCUP/ESR 08/11/2022 Eccup Beck, Harewood Estate Ponds, River Wharfe
LINDLEY WOOD/IRE 08/12/2022 River Washburn