Llyn Cefni reservoir dam gate overflowing from Llangefni lagoon surrounded by wooden fencing

llyn cefni reservoir dam gate overflowing llangefni lagoon surrounded wooden fencing anglesey rural scene north wales countryside bridge architecture lake wales walks welsh cefni industry strength construction pouring concrete generator flowing cascading wilderness renewable energy technology engineering environmental conservation electricity valley overcast flooding power conservation ecology hydro renewable production preservation power plant energy rushing discharge