© London News Pictures. 28/12/2015, Elan Valley, near Rhayader, Powys, Wales, UK. After weeks of heavy rain the waters dramatically cascade over the top the Caban Coch dam in the Elan Valley, west of Rhayader Powys Mid Wales.  According to a spokesman in the nearby visitor centre , a billion litres of water flow over the lip of the dam every day. Photo credit: Keith Morris/LNP