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 12/01/2023 Sladen Beck
STUBDEN/IRE 17/01/2023 Stubden Beck
THORNTON MOOR/IRE 17/01/2023 Stubden Beck
LEEMING/IRE 24/01/2023 Leeming Water
LEESHAW/IRE 24/01/2023 Dunkirk Beck
GILSTEAD/ESR 09/02/2023 Little Beck
PONDEN/IRE 09/02/2023 River Worth
ELDWICK/IRE 14/02/2023 Eldwick Beck
EMBSAY/IRE 21/02/2023 Embsay Beck
SILSDEN/IRE 28/02/2023 Silsden Beck
WEECHER/IRE 02/03/2023 Gill Beck
HEWENDEN/IRE 28/03/2023 Hewenden Beck
GRAINCLIFFE/IRE 04/04/2023 Eldwick Beck
ELSLACK/IRE 18/04/2023 Elslack Beck
WHINNY GILL/IRE 18/04/2023 Little Brook
FARNLEY STORM/SLK 26/04/2023 Wortley Beck
REVA/IRE 02/05/2023 Jum Beck
WINDLEDEN LOWER/IRE 02/05/2023 Embsay Beck
DOE PARK/IRE 09/05/2023 Denholme Beck
WATER SHEDDLES/IRE 20/06/2023 River Worth
LOWER LAITHE/IRE 06/07/2023 Sladen Beck
LEEMING/IRE 20/07/2023 Leeming Water
LEESHAW/IRE 20/07/2023 Dunkirk Beck
KEIGHLEY MOOR/IRE 25/07/2023 Morkin Beck
SILSDEN/IRE 15/08/2023 Silsden Beck
WEECHER/IRE 22/08/2023 Gill Beck
EMBSAY/IRE 24/08/2023 Embsay Beck
STUBDEN/IRE 05/09/2023 Stubden Beck
DOE PARK/IRE 26/09/2023 Denholme Beck
HEWENDEN/IRE 26/09/2023 Hewenden Beck
THORNTON MOOR/IRE 27/09/2023 Stubden Beck
ELDWICK/IRE 28/09/2023 Eldwick Beck
GRAINCLIFFE/IRE 28/09/2023 Eldwick Beck
ELSLACK/IRE 03/10/2023 Elslack Beck
WHINNY GILL/IRE 03/10/2023 Little Brook
REVA/IRE 05/10/2023 Jum Beck
PONDEN/IRE 17/10/2023 River Worth
GILSTEAD/ESR 19/10/2023 Little Beck
WATER SHEDDLES/IRE 05/12/2023 River Worth
KEIGHLEY MOOR/IRE 07/12/2023 Morkin Beck

Calder

Upper Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
GORPLE LOWER/IRE 19/01/2023 Hebden Stream
GORPLE UPPER/IRE 19/01/2023 Gorple Lower
WALSHAW DEAN MIDDLE/IRE 31/01/2023 Walshaw Dean Lower
WALSHAW DEAN UPPER/IRE 31/01/2023 Walshaw Dean Middle
GORPLEY/IRE 04/04/2023 Gorpley Clough
WALSHAW DEAN LOWER/IRE 20/06/2023 Hebden Stream
WIDDOP/IRE 27/06/2023 Hebden Stream
GORPLE LOWER/IRE 24/08/2023 Hebden Stream
GORPLE UPPER/IRE 24/08/2023 Gorple Lower
WALSHAW DEAN MIDDLE/IRE 29/08/2023 Walshaw Dean Lower
WALSHAW DEAN UPPER/IRE 29/08/2023 Walshaw Dean Middle
GORPLEY/IRE 03/10/2023 Gorpley Clough
WIDDOP/IRE 07/12/2023 Hebden Stream
WALSHAW DEAN LOWER/IRE 14/12/2023 Hebden Stream
Middle Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
MIXENDEN/IRE 26/01/2023 Hebble Brook
OGDEN/IRE 26/01/2023 Hebble Brook
RYBURN/IRE 07/02/2023 River Ryburn
DEANHEAD/IRE 23/02/2023 Black Burne Brook
SCAMMONDEN/IRE 23/02/2023 Black Brook
ALBERT/ESR 07/03/2023 To Sewer
RAMSDEN WOOD/ESR 07/03/2023 To Sewer
WITHENS CLOUGH/IRE 30/03/2023 Turvin Clough
BAITINGS/IRE 06/04/2023 River Ryburn
BOOTH DEAN LOWER/IRE 25/04/2023 Boothwood IRE
BOOTH DEAN UPPER/IRE 25/04/2023 Boothdean Lower IRE
BOOTH WOOD/IRE 25/04/2023 Booth Dean Clough
RINGSTONE/IRE 06/06/2023 Butts Clough
GREEN WITHENS/IRE 13/06/2023 Booth Dean
SPA CLOUGH/ESR 13/06/2023 Spa Clough
DEAN HEAD LOWER/IRE 22/06/2023 Luddenden Dean
DEAN HEAD UPPER/IRE 22/06/2023 Luddenden Dean
WARLEY MOOR/IRE 22/06/2023 Deanhead Upper
MIXENDEN/IRE 20/07/2023 Hebble Brook
OGDEN/IRE 20/07/2023 Hebble Brook
RYBURN/IRE 01/08/2023 River Ryburn
BAITINGS/IRE 14/09/2023 River Ryburn
BOOTH DEAN LOWER/IRE 26/09/2023 Boothwood IRE
BOOTH DEAN UPPER/IRE 26/09/2023 Boothdean Lower IRE
BOOTH WOOD/IRE 26/09/2023 Booth Dean Clough
DEANHEAD/IRE 12/10/2023 Black Burne Brook
SCAMMONDEN/IRE 12/10/2023 Black Brook
ALBERT/ESR 17/10/2023 To Sewer
RAMSDEN WOOD/ESR 17/10/2023 To Sewer
WITHENS CLOUGH/IRE 31/10/2023 Turvin Clough
RINGSTONE/IRE 21/11/2023 Butts Clough
DEAN HEAD LOWER/IRE 05/12/2023 Luddenden Dean
DEAN HEAD UPPER/IRE 05/12/2023 Luddenden Dean
WARLEY MOOR/IRE 05/12/2023 Deanhead Upper
GREEN WITHENS/IRE 12/12/2023 Booth Dean
SPA CLOUGH/ESR 12/12/2023 Spa Clough
Lower Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
WHITLEY/ESR 23/03/2023 Whitley Wood
ARDSLEY/ESR 20/04/2023 Haigh Moor Beck
ARDSLEY/ESR 28/09/2023 Haigh Moor Beck
WHITLEY/ESR 19/10/2023 Whitley Wood

Colne & Holme

Colne & Holme
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BLAKELEY/IRE 03/01/2023 Butterley IRE
BUTTERLEY/IRE 03/01/2023 Wessenden Brook
BOSHAW WHAMS/IRE 31/01/2023 Upper House Dyke
HOLMESTYES/IRE 31/01/2023 River Ribble
BILBERRY/IRE 02/02/2023 Digley IRE
DIGLEY/IRE 02/02/2023 Digley Brook
WESSENDEN HEAD/IRE 14/02/2023 Wessenden Brook
WESSENDEN OLD/IRE 14/02/2023 Blakeley IRE
LONGWOOD COMP/IRE 16/02/2023 Longwood Brook
LONGWOOD/ESR 16/02/2023 Longwood Brook
RIDING WOOD/IRE 21/02/2023 Ramsden IRE
YATEHOLME/IRE 21/02/2023 Netherley Clough
BROWNHILL/IRE 11/04/2023 River Holme
RAMSDEN/IRE 11/04/2023 Brownhill IRE
BLACKMOORFOOT/IRE (NORTH SIDE) 13/04/2023 Brow Grains Dyke
DEERHILL/IRE 13/04/2023 Bradley Brook
SNAILSDEN/IRE 13/06/2023 Harden Beck
BLAKELEY/IRE 15/06/2023 Butterley IRE
BUTTERLEY/IRE 15/06/2023 Wessenden Brook
RIDING WOOD/IRE 08/08/2023 Ramsden IRE
YATEHOLME/IRE 08/08/2023 Netherley Clough
WESSENDEN HEAD/IRE 15/08/2023 Wessenden Brook
WESSENDEN OLD/IRE 15/08/2023 Blakeley IRE
BOSHAW WHAMS/IRE 17/08/2023 Upper House Dyke
HOLMESTYES/IRE 17/08/2023 River Ribble
BILBERRY/IRE 19/09/2023 Digley IRE
DIGLEY/IRE 19/09/2023 Digley Brook
LONGWOOD COMP/IRE 24/10/2023 Longwood Brook
LONGWOOD/ESR 24/10/2023 Longwood Brook
BLACKMOORFOOT/IRE (NORTH SIDE) 02/11/2023 Brow Grains Dyke
DEERHILL/IRE 02/11/2023 Bradley Brook
BROWNHILL/IRE 14/11/2023 River Holme
RAMSDEN/IRE 14/11/2023 Brownhill IRE
SNAILSDEN/IRE 12/12/2023 Harden Beck

Derwent

Derwent
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
ELVINGTON/NO 1 ESR 09/03/2023 River Derwent
LOFTSOME BRIDGE/ESR 14/03/2023 River Derwent
TOPHILL LOW/NO 1 ESR 18/05/2023 River Hull
TOPHILL LOW/NO 2 ESR 18/05/2023 Barmston Drain
ELVINGTON/NO 1 ESR 07/09/2023 River Derwent
LOFTSOME BRIDGE/ESR 10/10/2023 River Derwent
TOPHILL LOW/NO 1 ESR 16/11/2023 River Hull
TOPHILL LOW/NO 2 ESR 16/11/2023 Barmston Drain

Don

Upper Don
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BROADSTONES/ESR 05/01/2023 Broadstones Dike
AGDEN/IRE 19/01/2023 Agden Beck
DALE DIKE/IRE 24/01/2023 River Loxley
RIVELIN LOWER/IRE 26/01/2023 River Rivelin
DAMFLASK/IRE 02/02/2023 River Loxley
RIVELIN UPPER/IRE 07/02/2023 Rivelin Lower IRE
RIVELIN/DEP POND IRE 07/02/2023 River Rivelin
REDMIRES LOWER/IRE 09/02/2023 Wyming Brook
REDMIRES MIDDLE/IRE 09/02/2023 Redmires Lower IRE
REDMIRES UPPER/IRE 09/02/2023 Redmires Middle IRE
UNDERBANK/IRE 16/02/2023 River Little Don
MOREHALL/IRE 02/03/2023 Ewden Beck
INGBIRCHWORTH/IRE 07/03/2023 Ingbirchworth Dike
SCOUT DIKE/IRE 09/03/2023 River Don
ROYD MOOR/IRE 30/03/2023 River Don
STRINES/IRE 04/04/2023 Dale Dike IRE
WINDLEDEN UPPER/IRE 02/05/2023 Windleden Lower IRE
WINSCAR/IRE 11/05/2023 River Don
MIDHOPE/IRE 06/06/2023 River Little Don
LANGSETT/IRE 08/06/2023 River Little Don
HARDEN/IRE 13/06/2023 Winscar IRE
BROADSTONES/ESR 15/06/2023 Broadstones Dike
AGDEN/IRE 20/06/2023 Agden Beck
DALE DIKE/IRE 22/06/2023 River Loxley
BROOMHEAD/IRE 27/06/2023 Morehall IRE
RIVELIN LOWER/IRE 20/07/2023 River Rivelin
DAMFLASK/IRE 01/08/2023 River Loxley
RIVELIN UPPER/IRE 03/08/2023 Rivelin Lower IRE
RIVELIN/DEP POND IRE 03/08/2023 River Rivelin
REDMIRES LOWER/IRE 10/08/2023 Wyming Brook
REDMIRES MIDDLE/IRE 10/08/2023 Redmires Lower IRE
REDMIRES UPPER/IRE 10/08/2023 Redmires Middle IRE
MOREHALL/IRE 05/09/2023 Ewden Beck
STRINES/IRE 03/10/2023 Dale Dike IRE
WINSCAR/IRE 10/10/2023 River Don
UNDERBANK/IRE 17/10/2023 River Little Don
WINDLEDEN LOWER/IRE 26/10/2023 Clough Beck
WINDLEDEN UPPER/IRE 26/10/2023 Windleden Lower IRE
ROYD MOOR/IRE 31/10/2023 River Don
INGBIRCHWORTH/IRE 07/11/2023 Ingbirchworth Dike
SCOUT DIKE/IRE 09/11/2023 River Don

Esk

Esk
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
RANDY MERE/ESR 27/04/2023 Oakley Beck
RANDY MERE/ESR 07/12/2023 Oakley Beck

Hull

Lower Hull
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BRANSHOLME/SLK 19/01/2023 River Hull
BRANSHOLME/SLK 20/07/2023 River Hull

 

Nidd

Nidd
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
ANGRAM/IRE 07/02/2023 Scar House IRE
SCAR HOUSE/IRE 07/02/2023 River Nidd
GOUTHWAITE/IRE 08/02/2023 River Nidd
JOHN O GAUNTS/IRE 11/04/2023 Oak Beck
SCARGILL/IRE 11/04/2023 Oak Beck
GOUTHWAITE/IRE 27/07/2023 River Nidd
ANGRAM/IRE 14/09/2023 Scar House IRE
SCAR HOUSE/IRE 14/09/2023 River Nidd
JOHN O GAUNTS/IRE 24/10/2023 Oak Beck
SCARGILL/IRE 24/10/2023 Oak Beck

Ouse

Upper Ouse
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
CLIFTON LAKE/SLK 16/03/2023 Drain
CLIFTON LAKE/SLK 28/09/2023 Drain

Swale

Middle & Lower Swale
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
THORNTON STEWARD/ESR 09/03/2023 Finghall Beck
COD BECK/IRE 16/05/2023 Cod Beck
THORNTON STEWARD/ESR 26/10/2023 Finghall Beck
COD BECK/IRE 31/10/2023 Cod Beck

Ure

Middle & Lower Ure
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
LUMLEY MOOR/IRE 30/03/2023 Holborn Beck
LEIGHTON/IRE 06/06/2023 River Burn
ROUNDHILL/IRE 06/06/2023 Leighton IRE
LUMLEY MOOR/IRE 14/11/2023 Holborn Beck
ROUNDHILL/IRE 30/11/2023 Leighton IRE
LEIGHTON/IRE 05/12/2023 River Burn

Wharfe & Washburn

Wharfe & Washburn
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
CHELKER/IRE 05/01/2023 Bank Gill Beck
FEWSTON/IRE 05/01/2023 Swinsty IRE
MARCH GHYLL/IRE 19/01/2023 Bow Beck
BARDEN LOWER/IRE 02/02/2023 Barden Beck
CARR BOTTOM/IRE 16/02/2023 Carr Beck
PANORAMA/IRE 16/02/2023 Black Beck
GRIMWITH/IRE 23/02/2023 River Dibb
ECCUP/ESR 28/02/2023 Eccup Beck, Harewood Estate Ponds, River Wharfe
SWINSTY/IRE 01/06/2023 River Washburn
THRUSCROSS/IRE 08/06/2023 River Washburn
CHELKER/IRE 15/06/2023 Bank Gill Beck
LINDLEY WOOD/IRE 20/06/2023 River Washburn
BARDEN UPPER/IRE 22/06/2023 Barden Beck
MARCH GHYLL/IRE 18/07/2023 Bow Beck
FEWSTON/IRE 20/07/2023 Swinsty IRE
BARDEN LOWER/IRE 17/08/2023 Barden Beck
GRIMWITH/IRE 12/09/2023 River Dibb
CARR BOTTOM/IRE 19/09/2023 Carr Beck
PANORAMA/IRE 19/09/2023 Black Beck
ECCUP/ESR 07/11/2023 Eccup Beck, Harewood Estate Ponds, River Wharfe
LINDLEY WOOD/IRE 07/12/2023 River Washburn
BARDEN UPPER/IRE 12/12/2023 Barden Beck
THRUSCROSS/IRE 12/12/2023 River Washburn
SWINSTY/IRE 14/12/2023 River Washburn