Llun: 1
Garw nant Fawr, Northwest corner of Llwyn On

Garw Nant Fawr forestry information centre at head of Llwyn On. Just opened, September 1976

Dyddiad: September 1976

Llun: 2
Garw nant Fawr, Northwest corner of Llwyn On

Garw Nant Fawr enters xxx Llwyn On Reservoir, Cwm taf

Llun: 3
Garw nant Fawr, Northwest corner of Llwyn On

Tributary stream enters Northwest corner of Llwyn On Reservoir

Llun: 4
Garw nant Fawr, Northwest corner of Llwyn On

Tributary enters Llwyn On from West, low water. 04/05/1971. Many feet higher in June 1971

Dyddiad: 04/05/1971

Llun: 5
Garw nant Fawr, Northwest corner of Llwyn On

Low water at Llwyn On Reservoir looking up Western tributary, 04/05/1971

Dyddiad: 04/05/1971

Llun: 6
Drowned Ynys-y-Felin Village. Llwyn On

Bridge, headwater marsh and half destroyed heronry. Llwyn On. July 1976 drought.

Dyddiad: July 1976

Llun: 7
Drowned Ynys-y-Felin Village. Llwyn On

5 weeks after this photo Taf Fawr shrank to a trickle. Bridge in Llwyn On reservoir. July 1976.

Dyddiad: July 1976

Llun: 8
Drowned Ynys-y-Felin Village. Llwyn On

Nant Carr carves a channel through alluvium of headwater marsh. Llwyn On. 1976 drought.

Dyddiad: 1976

Llun: 9
Drowned Ynys-y-Felin Village. Llwyn On

Bridge at top of Llwyn On. July 1976

Dyddiad: July 1976

Llun: 10
Drowned Ynys-y-Felin Village. Llwyn On

Llwyn On Reservoir. West bank low water. 4th May 1971. Very high by mid June.

Dyddiad: 04/05/1971

Llun: 11
Llwyn On Reservoir. Cwm Taf.

View to west side of upper Cwm Taf. Reservoir. 1971

Dyddiad: 1971

Llun: 12

Llwyn On full to the brim a few weeks after being 20ft down. 1976.

Dyddiad: 1976

Llun: 13

Llwyn On overflow. September after 1976 drought.

Dyddiad: September 1976

Llun: 14

Llwyn On from Cil Sanws cliff 1974.

Dyddiad: 1974

Llun: 15

Llwyn On Reservoir. Young firs. Old red sandstone knobs. 1971.

Dyddiad: 1971

Llun: 16

East side of Llwyn On. July 1976.

Dyddiad: July 1976

Llun: 17

View up Llwyn On Reservoir from south dam. 04/05/1971

Dyddiad: 04/05/1971

Llun: 18
Llwyn On Dam, Spillway. 1992

Llwyn On from the south. Coloured larches. 3rd November 1971.

Dyddiad: 03/11/1971

Llun: 19
Llwyn On Dam, Spillway. 1992

Llwyn On Reservoir. Dam tower and outlet. Cwm Taf. 4th May 1971.

Dyddiad: 04/05/1971

Llun: 20
Llwyn On Dam, Spillway. 1992

Llwyn On overflow a few weeks after 1976 drought.

Dyddiad: 1976

Llun: 21
Llwyn On Dam, Spillway. 1992

Llwyn On Reservoir. Empty overflow in 1976 drought. Mid Glamorgan ceded from Brecon.

Dyddiad: 1976

Llun: 22
Cil Sanws limestone. Taf Fawr. Baby badgers.1972

Dry stepped spillway from upper Cwm Taf Resevoir. May 1971

Dyddiad: May 1971