There is alarm about plans to build a dam on the Afon Cynfal near Llan Ffestiniog in Eryri. It would divert, at times, just short of 70% of the water around the iconic waterfall of Rhaeadr y Cwm, as part of a hydroelectric scheme.

Plans have been submitted for a hydroelectric scheme at Cwm Cynfal three times over the past 30 years. Three times they have been either refused or withdrawn. But in July this year the developers formally submitted another application. The deadline for objections is 20 September. Can you help?