Blue Mountains wilderness would be 'permanently' changed by raising dam wall, leak reveals

Draft report says Warragamba dam changes would affect Aboriginal historical sites

A leaked draft report has predicted world heritage areas of the Blue Mountains would be "permanently" changed by a controversial New South Wales government plan to raise a dam wall.

The state government is proposing to raise the walls of the Warragamba Dam by 14 metres to mitigate the impact of floods - a move that environmental activists say would flood Unesco-protected bushland, and endanger 50 historic Indigenous sites.