Thank you Lewis.

Yes I realise now that the factors need not sum to 1. You may have a good reason for allowing for a "nominal" value rather than the estimated average flow. BTW, I ran Ex 3 with Courant Factor = 0. The D W Inflow is now reported as 108,000 cu ft in stead of 71, 980 as per my hand calculation. Will wait for Beta B.

Regards.

Tilake.
Tilake.Weerasekara@GRIFFITH.NSW.GOV.AU