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
STUBDEN/IRE 02/01/2024 Stubden Beck
EMBSAY/IRE 04/01/2024 Embsay Beck
LOWER LAITHE/IRE 11/01/2024 Sladen Beck
THORNTON MOOR/IRE 16/01/2024 Stubden Beck
LEEMING/IRE 23/01/2024 Leeming Water
LEESHAW/IRE 23/01/2024 Dunkirk Beck
GILSTEAD/ESR 08/02/2024 Little Beck
PONDEN/IRE 08/02/2024 River Worth
ELDWICK/IRE 13/02/2024 Eldwick Beck
GRAINCLIFFE/IRE 13/02/2024 Eldwick Beck
SILSDEN/IRE 27/02/2024 Silsden Beck
WEECHER/IRE 29/02/2024 Gill Beck
REVA/IRE 29/02/2024 Jum Beck
HEWENDEN/IRE 19/03/2024 Hewenden Beck
ELSLACK/IRE 18/04/2024 Elslack Beck
WHINNY GILL/IRE 18/04/2024 Little Brook
DOE PARK/IRE 07/05/2024 Denholme Beck
BUTTERLEY/IRE 13/06/2024 Embsay Beck
EMBSAY/IRE 13/06/2024 Embsay Beck
WATER SHEDDLES/IRE 18/06/2024 River Worth
LOWER LAITHE/IRE 04/07/2024 Sladen Beck
LEEMING/IRE 18/07/2024 Leeming Water
LEESHAW/IRE 18/07/2024 Dunkirk Beck
KEIGHLEY MOOR/IRE 23/07/2024 Morkin Beck
SILSDEN/IRE 13/08/2024 Silsden Beck
STUBDEN/IRE 03/09/2024 Stubden Beck
THORNTON MOOR/IRE 03/09/2024 Stubden Beck
DOE PARK/IRE 24/09/2024 Denholme Beck
HEWENDEN/IRE 24/09/2024 Hewenden Beck
ELDWICK/IRE 26/09/2024 Eldwick Beck
GRAINCLIFFE/IRE 26/09/2024 Eldwick Beck
ELSLACK/IRE 01/10/2024 Elslack Beck
WHINNY GILL/IRE 01/10/2024 Little Brook
WEECHER/IRE 03/10/2024 Gill Beck
REVA/IRE 03/10/2024 Jum Beck
PONDEN/IRE 15/10/2024 River Worth
GILSTEAD/ESR 22/10/2024 Little Beck
WATER SHEDDLES/IRE 03/12/2024 River Worth
KEIGHLEY MOOR/IRE 05/12/2024 Morkin Beck

Calder

Upper Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
GORPLE LOWER/IRE 18/01/2024 Hebden Stream
GORPLE UPPER/IRE 18/01/2024 Gorple Lower
WALSHAW DEAN MIDDLE/IRE 30/01/2024 Walshaw Dean Lower
WALSHAW DEAN UPPER/IRE 30/01/2024 Walshaw Dean Middle
GORPLEY/IRE 02/04/2024 Gorpley Clough
WALSHAW DEAN LOWER/IRE 18/06/2024 Hebden Stream
WIDDOP/IRE 25/06/2024 Hebden Stream
GORPLE LOWER/IRE 22/08/2024 Hebden Stream
GORPLE UPPER/IRE 22/08/2024 Gorple Lower
WALSHAW DEAN MIDDLE/IRE 27/08/2024 Walshaw Dean Lower
WALSHAW DEAN UPPER/IRE 27/08/2024 Walshaw Dean Middle
GORPLEY/IRE 01/10/2024 Gorpley Clough
WIDDOP/IRE 05/12/2024 Hebden Stream
WALSHAW DEAN LOWER/IRE 12/12/2024 Hebden Stream
Middle Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
MIXENDEN/IRE 25/01/2024 Hebble Brook
OGDEN/IRE 25/01/2024 Hebble Brook
RYBURN/IRE 06/02/2024 River Ryburn
DEANHEAD/IRE 22/02/2024 Black Burne Brook
SCAMMONDEN/IRE 22/02/2024 Black Brook
ALBERT/ESR 05/03/2024 To Sewer
RAMSDEN WOOD/ESR 05/03/2024 To Sewer
BAITINGS/IRE 04/04/2024 River Ryburn
WITHENS CLOUGH/IRE 09/04/2024 Turvin Clough
BOOTH DEAN LOWER/IRE 23/04/2024 Boothwood IRE
BOOTH DEAN UPPER/IRE 23/04/2024 Boothdean Lower IRE
BOOTH WOOD/IRE 23/04/2024 Booth Dean Clough
RINGSTONE/IRE 04/06/2024 Butts Clough
GREEN WITHENS/IRE 11/06/2024 Booth Dean
SPA CLOUGH/ESR 11/06/2024 Spa Clough
DEAN HEAD LOWER/IRE 20/06/2024 Luddenden Dean
DEAN HEAD UPPER/IRE 20/06/2024 Luddenden Dean
WARLEY MOOR/IRE 20/06/2024 Deanhead Upper
MIXENDEN/IRE 18/07/2024 Hebble Brook
OGDEN/IRE 18/07/2024 Hebble Brook
RYBURN/IRE 30/07/2024 River Ryburn
BAITINGS/IRE 05/09/2024 River Ryburn
BOOTH DEAN LOWER/IRE 24/09/2024 Boothwood IRE
BOOTH DEAN UPPER/IRE 24/09/2024 Boothdean Lower IRE
BOOTH WOOD/IRE 24/09/2024 Booth Dean Clough
DEANHEAD/IRE 10/10/2024 Black Burne Brook
SCAMMONDEN/IRE 10/10/2024 Black Brook
ALBERT/ESR 15/10/2024 To Sewer
RAMSDEN WOOD/ESR 15/10/2024 To Sewer
WITHENS CLOUGH/IRE 29/10/2024 Turvin Clough
RINGSTONE/IRE 19/11/2024 Butts Clough
DEAN HEAD LOWER/IRE 03/12/2024 Luddenden Dean
DEAN HEAD UPPER/IRE 03/12/2024 Luddenden Dean
WARLEY MOOR/IRE 03/12/2024 Deanhead Upper
GREEN WITHENS/IRE 10/12/2024 Booth Dean
SPA CLOUGH/ESR 10/12/2024 Spa Clough
Lower Calder
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
WHITLEY/ESR 21/03/2024 Whitley Wood
ARDSLEY/ESR 25/04/2024 Haigh Moor Beck
ARDSLEY/ESR 26/09/2024 Haigh Moor Beck
WHITLEY/ESR 17/10/2024 Whitley Wood

Colne & Holme

Colne & Holme
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BLAKELEY/IRE 09/01/2024 Butterley IRE
BUTTERLEY/IRE 09/01/2024 Wessenden Brook
BOSHAW WHAMS/IRE 30/01/2024 Upper House Dyke
HOLMESTYES/IRE 30/01/2024 River Ribble
BILBERRY/IRE 01/02/2024 Digley IRE
DIGLEY/IRE 01/02/2024 Digley Brook
WESSENDEN HEAD/IRE 13/02/2024 Wessenden Brook
WESSENDEN OLD/IRE 13/02/2024 Blakeley IRE
LONGWOOD COMP/IRE 15/02/2024 Longwood Brook
LONGWOOD/ESR 15/02/2024 Longwood Brook
RIDING WOOD/IRE 20/02/2024 Ramsden IRE
YATEHOLME/IRE 20/02/2024 Netherley Clough
BROWNHILL/IRE 14/03/2024 River Holme
RAMSDEN/IRE 14/03/2024 Brownhill IRE
BLACKMOORFOOT/IRE (NORTH SIDE) 19/03/2024 Brow Grains Dyke
DEERHILL/IRE 19/03/2024 Bradley Brook
SNAILSDEN/IRE 11/06/2024 Harden Beck
BLAKELEY/IRE 13/06/2024 Butterley IRE
RIDING WOOD/IRE 06/08/2024 Ramsden IRE
YATEHOLME/IRE 06/08/2024 Netherley Clough
WESSENDEN HEAD/IRE 13/08/2024 Wessenden Brook
WESSENDEN OLD/IRE 13/08/2024 Blakeley IRE
BOSHAW WHAMS/IRE 15/08/2024 Upper House Dyke
HOLMESTYES/IRE 15/08/2024 River Ribble
BILBERRY/IRE 17/09/2024 Digley IRE
DIGLEY/IRE 17/09/2024 Digley Brook
LONGWOOD COMP/IRE 22/10/2024 Longwood Brook
LONGWOOD/ESR 22/10/2024 Longwood Brook
BLACKMOORFOOT/IRE (NORTH SIDE) 31/10/2024 Brow Grains Dyke
DEERHILL/IRE 31/10/2024 Bradley Brook
BROWNHILL/IRE 12/11/2024 River Holme
RAMSDEN/IRE 12/11/2024 Brownhill IRE
SNAILSDEN/IRE 10/12/2024 Harden Beck

Derwent

Derwent
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
LOFTSOME BRIDGE/ESR 14/03/2024 River Derwent
LOFTSOME BRIDGE/ESR 08/10/2024 River Derwent

Don

Upper Don
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
BROADSTONES/ESR 04/01/2024 Broadstones Dike
AGDEN/IRE 18/01/2024 Agden Beck
DALE DIKE/IRE 23/01/2024 River Loxley
RIVELIN LOWER/IRE 25/01/2024 River Rivelin
DAMFLASK/IRE 01/02/2024 River Loxley
RIVELIN UPPER/IRE 06/02/2024 Rivelin Lower IRE
RIVELIN/DEP POND IRE 06/02/2024 River Rivelin
REDMIRES LOWER/IRE 08/02/2024 Wyming Brook
REDMIRES MIDDLE/IRE 08/02/2024 Redmires Lower IRE
REDMIRES UPPER/IRE 08/02/2024 Redmires Middle IRE
UNDERBANK/IRE 15/02/2024 River Little Don
MOREHALL/IRE 29/02/2024 Ewden Beck
INGBIRCHWORTH/IRE 05/03/2024 Ingbirchworth Dike
SCOUT DIKE/IRE 07/03/2024 River Don
ROYD MOOR/IRE 21/03/2024 River Don
STRINES/IRE 02/04/2024 Dale Dike IRE
WINDLEDEN LOWER/IRE 30/04/2024 Clough Beck
WINDLEDEN UPPER/IRE 30/04/2024 Windleden Lower IRE
WINSCAR/IRE 09/05/2024 River Don
MIDHOPE/IRE 04/06/2024 River Little Don
LANGSETT/IRE 06/06/2024 River Little Don
HARDEN/IRE 11/06/2024 Winscar IRE
BROADSTONES/ESR 13/06/2024 Broadstones Dike
AGDEN/IRE 18/06/2024 Agden Beck
DALE DIKE/IRE 20/06/2024 River Loxley
BROOMHEAD/IRE 25/06/2024 Morehall IRE
RIVELIN LOWER/IRE 18/07/2024 River Rivelin
DAMFLASK/IRE 30/07/2024 River Loxley
RIVELIN UPPER/IRE 01/08/2024 Rivelin Lower IRE
RIVELIN/DEP POND IRE 01/08/2024 River Rivelin
REDMIRES LOWER/IRE 08/08/2024 Wyming Brook
REDMIRES MIDDLE/IRE 08/08/2024 Redmires Lower IRE
REDMIRES UPPER/IRE 08/08/2024 Redmires Middle IRE
MOREHALL/IRE 03/09/2024 Ewden Beck
STRINES/IRE 01/10/2024 Dale Dike IRE
WINSCAR/IRE 08/10/2024 River Don
UNDERBANK/IRE 15/10/2024 River Little Don
WINDLEDEN LOWER/IRE 24/10/2024 Clough Beck
WINDLEDEN UPPER/IRE 24/10/2024 Windleden Lower IRE
ROYD MOOR/IRE 29/10/2024 River Don
INGBIRCHWORTH/IRE 05/11/2024 Ingbirchworth Dike
SCOUT DIKE/IRE 07/11/2024 River Don
MIDHOPE/IRE 21/11/2024 River Little Don
BROOMHEAD/IRE 03/12/2024 Morehall IRE
LANGSETT/IRE 05/12/2024 River Little Don
HARDEN/IRE 10/12/2024 Winscar IRE

 

Nidd

Nidd
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
ANGRAM/IRE 06/02/2024 Scar House IRE
SCAR HOUSE/IRE 06/02/2024 River Nidd
GOUTHWAITE/IRE 07/03/2024 River Nidd
JOHN O GAUNTS/IRE 18/04/2024 Oak Beck
SCARGILL/IRE 18/04/2024 Oak Beck
GOUTHWAITE/IRE 05/09/2024 River Nidd
ANGRAM/IRE 19/09/2024 Scar House IRE
SCAR HOUSE/IRE 19/09/2024 River Nidd
SCARGILL/IRE 22/10/2024 Oak Beck
JOHN O GAUNTS/IRE 22/10/2024 Oak Beck

Swale

Middle & Lower Swale
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
THORNTON STEWARD/ESR 07/03/2024 Finghall Beck
COD BECK/IRE 14/05/2024 Cod Beck
THORNTON STEWARD/ESR 24/10/2024 Finghall Beck
COD BECK/IRE 29/10/2024 Cod Beck

 

Ure

Middle & Lower Ure
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
LUMLEY MOOR/IRE 21/03/2024 Holborn Beck
LEIGHTON/IRE 04/06/2024 River Burn
ROUNDHILL/IRE 04/06/2024 Leighton IRE
LUMLEY MOOR/IRE 12/11/2024 Holborn Beck
ROUNDHILL/IRE 28/11/2024 Leighton IRE
LEIGHTON/IRE 03/12/2024 River Burn

 

Wharfe & Washburn

Wharfe & Washburn
RESERVOIR DATE NAME OF WATERCOURSE AFFECTED
FEWSTON/IRE 04/01/2024 Swinsty IRE
CHELKER/IRE 04/01/2024 Bank Gill Beck
MARCH GHYLL/IRE 18/01/2024 Bow Beck
BARDEN LOWER/IRE 01/02/2024 Barden Beck
CARR BOTTOM/IRE 15/02/2024 Carr Beck
PANORAMA/IRE 15/02/2024 Black Beck
GRIMWITH/IRE 22/02/2024 River Dibb
ECCUP/ESR 27/02/2024 Eccup Beck, Harewood Estate Ponds, River Wharfe
SWINSTY/IRE 21/05/2024 River Washburn
THRUSCROSS/IRE 06/06/2024 River Washburn
CHELKER/IRE 13/06/2024 Bank Gill Beck
LINDLEY WOOD/IRE 18/06/2024 River Washburn
BARDEN UPPER/IRE 20/06/2024 Barden Beck
MARCH GHYLL/IRE 16/07/2024 Bow Beck
FEWSTON/IRE 18/07/2024 Swinsty IRE
BARDEN LOWER/IRE 15/08/2024 Barden Beck
GRIMWITH/IRE 10/09/2024 River Dibb
CARR BOTTOM/IRE 17/09/2024 Carr Beck
PANORAMA/IRE 17/09/2024 Black Beck
ECCUP/ESR 05/11/2024 Eccup Beck, Harewood Estate Ponds, River Wharfe
LINDLEY WOOD/IRE 05/12/2024 River Washburn
BARDEN UPPER/IRE 10/12/2024 Barden Beck
THRUSCROSS/IRE 10/12/2024 River Washburn
SWINSTY/IRE 12/12/2024 River Washburn