Prince Charles trialled this on his estate in Cornwall as a more eco-friendly way of water management back in 1987. Using only the finest taxpayers money they managed to trouser over £38million trying to teach otters to craft rudimentary lock gates and side ponds. But after 8 years and many all-expenses paid trips to Canada, animal behaviourists were forced to admit defeat when it was realised the otters demands for fish and protection money were just too high, also they just couldn't get the mitres right. You can still see evidence of the experimental two mile stretch with associated dams, lake, club house, McDonalds and Laura Ashley Outlet shop. The otters still receive an undisclosed amount of fish from the Treasury and have threatened to throw spoor at Prince Charles on sight.