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- Subcatchment:1000 - 10000
- Subcatchment:ABBEY RIVER
- Subcatchment:ALHAM
- Subcatchment:ALLEN (Amen Corner to Didlington)
- Subcatchment:ALLEN (FAL)
- Subcatchment:ALLEN (Headwaters)
- Subcatchment:ALLEN (Lower)
- Subcatchment:ALLER BROOK
- Subcatchment:ALLER BROOK (TEIGN) Lower
- Subcatchment:ALLER BROOK (TEIGN) Upper
- Subcatchment:ALLER Tidal
- Subcatchment:ALPHIN BROOK
- Subcatchment:AM BROOK
- Subcatchment:ANGARRACK STREAM
- Subcatchment:ARGAL STREAM
- Subcatchment:ASHBURN
- Subcatchment:ASH BROOK
- Subcatchment:ASKER
- Subcatchment:AVILL
- Subcatchment:AVON
- Subcatchment:AYLESBEARE STREAM
- Subcatchment:Aa (Noord-Brabant)
- Subcatchment:Abberd Bk - source to conf R Marden
- Subcatchment:Abbotsley & Hen Brooks
- Subcatchment:Aber
- Subcatchment:Acequia de Sils
- Subcatchment:Ackland Beck (trib of Costa Beck)
- Subcatchment:Adda
- Subcatchment:Addington Brook
- Subcatchment:Addlestone Bourne (Mill/Hale to Chertsey Bourne)
- Subcatchment:Addlestone Bourne (West End to Hale/Mill Bourne confluence at Mimbridge)
- Subcatchment:Adlingfleet Drain Upper Catchment (trib of Trent)
- Subcatchment:Adur
- Subcatchment:Adur (Burgess Hill)
- Subcatchment:Adur (East)
- Subcatchment:Adur (Hammer pond)
- Subcatchment:Adur (Knepp)
- Subcatchment:Adur (Lancing brook)
- Subcatchment:Adur (Lottbridge)
- Subcatchment:Adur (Lower)
- Subcatchment:Aeron - confluence with Gwili to tidal limit
- Subcatchment:Aeron - headwaters to confluence with Gwili
- Subcatchment:Afan - conf with Corrwg to confluence with Pelenna
- Subcatchment:Afan - confluence with Pelenna to tidal limit
- Subcatchment:Afan - headwaters to confluence with Corrwg
- Subcatchment:Afon Arban - source to conf Afon Claerwen
- Subcatchment:Afon Banwy - conf Afon Gam to Afon Vyrnwy
- Subcatchment:Afon Banwy - conf Afon Twrch to conf Afon Gam
- Subcatchment:Afon Banwy - source to conf Afon Twrch
- Subcatchment:Afon Bidno - source to conf R Wye
- Subcatchment:Afon Cain - conf Nant Fyllon to conf The Brogan
- Subcatchment:Afon Cain - conf The Brogan to conf Afon Vyrnwy
- Subcatchment:Afon Cammarch - source to conf R Irfon
- Subcatchment:Afon Carno - conf Afon Cwm-llwyd to conf R Severn
- Subcatchment:Afon Carno - source to conf Afon Cwm-llwyd
- Subcatchment:Afon Cedig - source to Lake Vyrnwy
- Subcatchment:Afon Cerist - conf Afon Trannon to conf R Severn
- Subcatchment:Afon Cerist - source to conf Afon Trannon
- Subcatchment:Afon Chwefru - source to conf R Irfon
- Subcatchment:Afon Claerwen - conf Afon Arban to conf Rhiwnant
- Subcatchment:Afon Claerwen - source to conf Afon Arban
- Subcatchment:Afon Clwedog - source to conf Afon Lwyd
- Subcatchment:Afon Clywedog - Clywedog Dam to R Severn
- Subcatchment:Afon Cownwy - source to conf Afon Vyrnwy
- Subcatchment:Afon Crai - source to conf R Usk
- Subcatchment:Afon Crawnon - source to conf R Usk
- Subcatchment:Afon Cwm-llwyd - source to conf Afon Carno
- Subcatchment:Afon Cynllaith - source to conf Afon Tanat
- Subcatchment:Afon Cynon - source to conf Aman R
- Subcatchment:Afon Cynrig - source to conf R Usk
- Subcatchment:Afon Dulas - source to conf R Severn
- Subcatchment:Afon Einion - source to conf Afon Banwy
- Subcatchment:Afon Eirth - source to conf Afon Tanat
- Subcatchment:Afon Elan - Caban-coch Rsvr to conf R Wye
- Subcatchment:Afon Elan - source to Pont ar Elan
- Subcatchment:Afon Gam - conf Cledan to conf Afon Banwy
- Subcatchment:Afon Gam - source to conf Cledan
- Subcatchment:Afon Garth Dulas - source to conf R Irfon
- Subcatchment:Afon Gwesyn - source to conf R Irfon
- Subcatchment:Afon Hirddu - source to Lake Vyrnwy
- Subcatchment:Afon Honddu - source to conf R Monnow
- Subcatchment:Afon Hydfer - source to conf R Usk
- Subcatchment:Afon Iwrch - source to conf Afon Tanat
- Subcatchment:Afon Llynfi - conf Dulas Bk to conf R Wye
- Subcatchment:Afon Llynfi - source to conf Dulas Bk
- Subcatchment:Afon Lwyd - conf Dowlais Bk to Pont Sadwrn
- Subcatchment:Afon Lwyd - source to conf Dowlais Bk
- Subcatchment:Afon Lwyd - source to conf Llyn Clywedog
- Subcatchment:Afon Marteg - source to conf R Wye
- Subcatchment:Afon Nadroedd - source to Lake Vyrnwy
- Subcatchment:Afon Rhaeadr - source to conf Afon Tanat
- Subcatchment:Afon Rhiw (N Arm) - Llyn y Bugail to Dwyrhiew
- Subcatchment:Afon Rhiw (S arm) - Ty-newydd to Dwyrhiew
- Subcatchment:Afon Rhiw (conf N and S arm) to conf R Severn
- Subcatchment:Afon Rhondda Fach - source to conf Rhondda R
- Subcatchment:Afon Senni - conf unnamed trib to conf R Usk
- Subcatchment:Afon Senni - source to conf unnamed trib
- Subcatchment:Afon Taf Fawr - source to conf Taf Fechan
- Subcatchment:Afon Tanat - conf Afon Eirth to conf Hirnant
- Subcatchment:Afon Tanat - conf Afon Rhaeadr to conf Afon Vyrnwy
- Subcatchment:Afon Tanat - conf Hirnant to conf Afon Rhaeadr
- Subcatchment:Afon Tanat - source to conf Afon Eirth
- Subcatchment:Afon Tarell - source to conf R Usk
- Subcatchment:Afon Tarenig - source to conf R Wye
- Subcatchment:Afon Trannon - source to nr Argoed
- Subcatchment:Afon Twrch - source to conf Afon Banwy
- Subcatchment:Afon Vyrnwy - conf Afon Cownwy to conf Afon Banwy
- Subcatchment:Afon Vyrnwy - conf Afon Tanat to conf R Severn
- Subcatchment:Afon Yscir - conf Yscir Fechan to conf R Usk
- Subcatchment:Afon Yscir - source to conf Yscir Fechan
- Subcatchment:Aglionby Beck Catchment (Trib of Black Burn)
- Subcatchment:Aguanaz
- Subcatchment:Aike Beck
- Subcatchment:Ain
- Subcatchment:Aira Beck
- Subcatchment:Aire from Esholt STW to River Calder
- Subcatchment:Aire from Eshton Beck to Gill Beck (Baildon)
- Subcatchment:Aire from Otterburn Beck to Eshton Beck
- Subcatchment:Aire from River Calder to River Ouse
- Subcatchment:Akenshaw Burn from Source to Lewis Burn
- Subcatchment:Alagnon
- Subcatchment:Alagnon-AP
- Subcatchment:Alaw
- Subcatchment:Albrighton Bk/R Worfe to conf Wesley Bk
- Subcatchment:Alconbury & Brampton Brooks
- Subcatchment:Alconbury Brook
- Subcatchment:Aldbourne
- Subcatchment:Aldbrough Beck from Forcett Park Catch to Clow Bk
- Subcatchment:Aldbrough Bk from Source to Forcett Park Catchment
- Subcatchment:Alde
- Subcatchment:Alde - Ore (d/s confluence)
- Subcatchment:Alde and Ore (Tidal) Boulge Hall Marshes
- Subcatchment:Alde and Ore (Tidal) Drains
- Subcatchment:Alde and Ore (Tidal) Icken Marshes
- Subcatchment:Alde and Ore (Tidal) Sudbourne Marshes
- Subcatchment:Alder Stream & Hammer Dyke
- Subcatchment:Alderbourne
- Subcatchment:Aldford Brook
- Subcatchment:Aldingbourne Rife
- Subcatchment:Aldingbourne Rife Lower
- Subcatchment:Aldingbourne Rife Mid
- Subcatchment:Aled - Elwy to Deunant
- Subcatchment:Aled - above Deunant
- Subcatchment:Alfreton Brook from Source to Westwood Brook
- Subcatchment:Alfreton Brook from Westwood Brook to R Amber
- Subcatchment:Alledge Brook
- Subcatchment:Allen Brook(Maiden brook)
- Subcatchment:Allen Trib (Crichel Stream)
- Subcatchment:Allen Trib (Gussage Stream)
- Subcatchment:Allen Trib (Zannies Coppice - Witchampton
- Subcatchment:Allen from Source to West Allen
- Subcatchment:Allen from West Allen to South Tyne
- Subcatchment:Aller
- Subcatchment:Allier
- Subcatchment:Allt y Gelli - headwaters to tidal limit
- Subcatchment:Alltwalis - headwaters to confluence with Gwili
- Subcatchment:Aln & Shawdon Burn from Coe Burn to Edlingham Burn
- Subcatchment:Aln from Callaly Burn to Coe Burn
- Subcatchment:Aln from Edlingham Burn to Tidal Limit
- Subcatchment:Aln from Source to Callaly Burn
- Subcatchment:Alne Beck from Source to River Kyle
- Subcatchment:Also includes Clatter Brook.
- Subcatchment:Alt
- Subcatchment:Alun - headwaters to confluence with Ewenny
- Subcatchment:Alun - headwaters to tidal limit, Porth Clais
- Subcatchment:Alverstone Stream (Medina)
- Subcatchment:Alwen - Ceirw to Brenig
- Subcatchment:Alwen - Dee to Ceirw
- Subcatchment:Alwen - above Afon Brenig
- Subcatchment:Alwin Catchment (trib of Coquet)
- Subcatchment:Alyn - Hope to confluence with Dee
- Subcatchment:Alyn - Leadmill to Hope, US STW
- Subcatchment:Alyn - Rhydymwyn to Leadmill
- Subcatchment:Alyn - upper river above Rhydymwyn
- Subcatchment:Aman - conf with Garnant to conf with Loughor
- Subcatchment:Aman - headwaters to confluence with Garnant
- Subcatchment:Aman R - source to conf Afon Cynon
- Subcatchment:Amerton Brook Catchment (trib of Trent)
- Subcatchment:Ampney and Poulton Brooks (Source to Thames)
- Subcatchment:Ancholme from Bishopbridge to the Humber
- Subcatchment:Anderby Main Drain
- Subcatchment:Angell
- Subcatchment:Anghof - headwaters to conf with Western Cleddau
- Subcatchment:Angle Stream North - headwaters to tidal limit
- Subcatchment:Angle Stream South - headwaters to tidal limit
- Subcatchment:Annell - headwaters to confluence with Cothi
- Subcatchment:Annell - headwaters to confluence with Tywi
- Subcatchment:Anston Brook from Source to River Ryton
- Subcatchment:Ant (Dilham to R. Bure)
- Subcatchment:Ant (North Walsham and Dilham Canal)
- Subcatchment:Anton - Lower
- Subcatchment:Anton - Upper
- Subcatchment:Anwick Catchwater
- Subcatchment:Anzur
- Subcatchment:Apedale Beck Catch (trib of River Ure)
- Subcatchment:Appennino centrale
- Subcatchment:Aragón
- Subcatchment:Arberth - headwaters to confluence with Teifi
- Subcatchment:Arclid Brook
- Subcatchment:Arga
- Subcatchment:Arges
- Subcatchment:Argill Beck
- Subcatchment:Arkle Beck from Source to River Swale
- Subcatchment:Arle
- Subcatchment:Arle - Upstream of Drove Lane
- Subcatchment:Arley Brook (Source to Gale Brook)
- Subcatchment:Arram Beck 1
- Subcatchment:Arrowe Brook and The Fender also included.
- Subcatchment:Arroyo del Concejo y Arroyo Tamujoso
- Subcatchment:Arth - headwaters to tidal limit
- Subcatchment:Arthog
- Subcatchment:Artle Beck
- Subcatchment:Artro
- Subcatchment:Artro - upper
- Subcatchment:Arun
- Subcatchment:Arun (Lower)
- Subcatchment:Arun (Tidal)
- Subcatchment:Ash & Stanwell brook
- Subcatchment:Ash (from Meesden to confluence with Bury Green Brook)
- Subcatchment:Ash (from confluence with Bury Green Brook to Lee)
- Subcatchment:Ash Brook (Darley Brook to Wettenhall Brook)
- Subcatchment:Ash Brook (Source to Darley Brook)
- Subcatchment:Ash Brook (Wettenhall Brook to Weaver)
- Subcatchment:Ash Brook Catchment (trib of Blithe)
- Subcatchment:Ash Levels
- Subcatchment:Ashbourne Stream, Hugletts conf to Nunningham Str.
- Subcatchment:Ashbourne Stream upstream of Hugletts confluence
- Subcatchment:Ashby Brook (Source to Cherwell)
- Subcatchment:Asheldham Brook
- Subcatchment:Ashes Beck
- Subcatchment:Ashfoldside Beck to River Nidd
- Subcatchment:Ashford Water (Allen River)
- Subcatchment:Ashton Brook
- Subcatchment:Astense Aa
- Subcatchment:Astley Brook (Irwell)
- Subcatchment:Astley Brook (Mersey)
- Subcatchment:Asón
- Subcatchment:Atherfield Stream
- Subcatchment:Audlem Brook
- Subcatchment:Augill Beck
- Subcatchment:Aume
- Subcatchment:Aurino
- Subcatchment:Austrey catchment (trib of Anker)
- Subcatchment:Austwick beck
- Subcatchment:Avill River
- Subcatchment:Avon
- Subcatchment:Avon (Devon)
- Subcatchment:Avon (DevonTidal) and Sth Hams - Frogmore
- Subcatchment:Avon (Devon Tidal) and Sth Hams - Blackpool
- Subcatchment:Avon (Devon Tidal) and Sth Hams - Slapton
- Subcatchment:Avon Water
- Subcatchment:Aylesford Bk - source to conf R Camlad
- Subcatchment:Aylesford Stream
- Subcatchment:Ayleston Brook
- Subcatchment:BACK STREAM Lower
- Subcatchment:BADGWORTHY WATER
- Subcatchment:BEADON BROOK
- Subcatchment:BEAFORD BROOK
- Subcatchment:BECKA BROOK
- Subcatchment:BEER HACKETT STR
- Subcatchment:BENNY STREAM
- Subcatchment:BERE STREAM
- Subcatchment:BIDWELL BROOK
- Subcatchment:BLACKATON BROOK
- Subcatchment:BLACKBROOK RIVER
- Subcatchment:BLACKWATER RIVER
- Subcatchment:BOKIDDICKSTREAM
- Subcatchment:BOLESBRIDGE WATER
- Subcatchment:BOLHAM RIVER
- Subcatchment:BOLINGEY STREAM
- Subcatchment:BOURNE
- Subcatchment:BOW BROOK (North & South)
- Subcatchment:BRAMBLE BROOK
- Subcatchment:BRANSCOMBE STREAM
- Subcatchment:BRAY
- Subcatchment:BRIDE
- Subcatchment:BRIGHTON STREAM
- Subcatchment:BRIT (Lower)
- Subcatchment:BRIT (Upper)
- Subcatchment:BRIT (d/s Conf with Simene)
- Subcatchment:BROAD
- Subcatchment:BROADWOOD BROOK
- Subcatchment:BROCKEY RIVER
- Subcatchment:BUDE CANAL
- Subcatchment:BUDLEIGH BROOK
- Subcatchment:BULLOW BROOK
- Subcatchment:BURCOMBE STREAM
- Subcatchment:BURN (EXE)
- Subcatchment:BURN (TAVY)
- Subcatchment:Baakse Beek
- Subcatchment:Babingley River
- Subcatchment:Bacchiglione - Brenta
- Subcatchment:Bach
- Subcatchment:Bach Howey Bk - source to conf R Wye
- Subcatchment:Bachell Bk - source to conf Clywedog Bk
- Subcatchment:Bacino scolante della laguna di Venezia
- Subcatchment:Back (Carwinley) Burn
- Subcatchment:Back Bk - source to conf R Stour
- Subcatchment:Back Drain and Sluice
- Subcatchment:Back Stream
- Subcatchment:Badsey Bk - conf Bretforton Bk to conf R Avon
- Subcatchment:Badsey Bk - source to conf Bretforton Bk
- Subcatchment:Bag Brook
- Subcatchment:Baglan Brook - headwaters to conf with River Neath
- Subcatchment:Bailey Bk - source to conf R Tern
- Subcatchment:Bailey Brook from Source to River Erewash
- Subcatchment:Bailey Water
- Subcatchment:Bain
- Subcatchment:Bain (Grimblethorpe arm)
- Subcatchment:Bain - Middle
- Subcatchment:Bain - Upper
- Subcatchment:Balder Catchment (trib of Tees)
- Subcatchment:Balderton drain
- Subcatchment:Baldhorns Brook
- Subcatchment:Baldon Brook (South of Oxford)
- Subcatchment:Bar Brook from Blackleach Brook to R Derwent
- Subcatchment:Bar Brook from Source to Blackleach Brook
- Subcatchment:Barben Beck/River Dibb Catchment (trib of Wharfe)
- Subcatchment:Barbon Beck (Barkin Beck)
- Subcatchment:Barden Beck Catchment (trib of Wharfe)
- Subcatchment:Barden Mill Stream
- Subcatchment:Bargod - headwaters to confluence with Teifi
- Subcatchment:Barkham Brook
- Subcatchment:Barlam/Skirpen Bks catch (trib of Derwent)
- Subcatchment:Barlings Eau
- Subcatchment:Barlow Brook from Source to River Drone
- Subcatchment:Barmston Farm Area (Wear N Bank)
- Subcatchment:Barmston Sea Drain / Skipsea Drain to Conf
- Subcatchment:Barmston Sea Drain from Skipsea Drain to N Sea
- Subcatchment:Barnaby Pil - headwaters to tidal limit
- Subcatchment:Barnett Brook (Sales Brook to Weaver)
- Subcatchment:Barnett Brook (Source to Sales Brook)
- Subcatchment:Barney Bk/Hard Level Gill from Source to R Swale
- Subcatchment:Barnfields Stream
- Subcatchment:Barnwell Brook
- Subcatchment:Barrasford Burn Catchment (trib of N Tyne)
- Subcatchment:Barrow Beck (lower end)
- Subcatchment:Barrow Beck (upper end)
- Subcatchment:Barrow Brook
- Subcatchment:Barrow Burn Catchment (trib of Coquet)
- Subcatchment:Barry Brook - headwaters to tidal limit
- Subcatchment:Bartley Mill Stream
- Subcatchment:Bartley Water
- Subcatchment:Bartley Water Lower
- Subcatchment:Barton (Westfield) Brook