"In normal weather conditions the flow (from Black Keld) is between 0.075 cubic metres per second and 0.150 cubic metres per second (1000 to 2000 gallons per minute), but this can easily double after heavy rain. The catchment area of this resurgence is enormous. To the north, the stream sinking at Fog Cave and finally disappearing at Rain Pot is the limit of the watershed whilst to the south the dividing line between Black Keld and the Linton Low Mill rising is uncertain. The syphon passage of Mossdale Caverns and the stream sink at Gill House Pot are the southernmost feeds which have been definitely proved to flow to Black Keld. The destination of the water which disappears at Stream End Cave in Mossdale is uncertain. A similar uncertainty exists for the water sinking at Black Edge Pot and also for that at How Gill Nick where 5lbs of flourescein failed to appear anywhere in detectable concentrations! A small stream sinking below the old smelter at Grassington Moor has been positively shown to resurge at Low Mill so the dividing line must be somewhere between Gill House and the track from Yarnbury up to the old lead mines." Rob Shackleton Cambridge Underground 1977 pp 16-27 'RECENT DISCOVERIES IN BLACK KELD' |
