Valley System
"Weaver"
"Mersey"
"Bollin"
"Etherow"
"Irwell"
"Tame"
"Moss Brook"
"Eagley Brook"
"Calder"
"Douglas"
"Groal"
"Hodder"
"Lune"
"Roeburn"
"Wyre"
"Artle Beck"
"Landgen Brook"
"Pilling Brook"
"Dee"
"Irk"
"Medlock"
"Roch"
"Glaze Brook"
"Darwen"
"Greta"
"Hindburn"
"Keer"
"Ribble"
"Wenning"
"Bradshaw Brook"
"Stock Beck"
"N/A  - Crushed Rock Aggregate"
"Dane"