The Canadian Press The chief of Williams Lake First Nation says water building behind a landslide of debris that has dammed the Chilcotin River in British Columbia’s central Interior appears to have nearly doubled in size since Wednesday. Chief Willie Sellars, who toured the slide site by helicopter Wednesday and Thursday, says the water is continuing to build on one side of the dam, while the riverbed on the other side had “completely dried up” for about two kilometres. Officials have said the water collecting behind the slide south of Williams Lake could reach a level where it will start flowing over the debris, or it will erode the material, setting off a release. They have estimated a release could come Friday or Saturday, and could set off dozens of…