The works are to decommission the reservoir under the Reservoirs Act 1975, and are in the interest of safety under Section 10(3)c of the Act. The works would involve cutting a notch into the Lower Neuadd Reservoir dam, which is part of the curtilage of the listed Filter house (LB no: 84832). This involves a partial demolition of the earthen dam, although the spillway would be retained. A new pedestrian bridge would be constructed to replace the disrupted public right of way (which currently runs along the top of the dam) but this would be undertaken under a separate application for listed building consent.

The site is the earthen dam of the Lower Neuadd Reservoir in the Taf Fechan valley (Brecon Beacons National Park). It is located at the southern end of the reservoir.