The primary system is designed for a
flood event of 5,500 cumecs of water; that’s a lot of water. The secondary system has been
designed for 6,500 cumecs of water. 1 cubic metre is of course a tonne of water so that’s
equivalent to the weight of a Honda Civic. So 5,500 cubic metres per second, is equivalent
to 5,500 Honda Civics going past.