Could you please tell me if there is a formula for working out the speed water will flow at a given drop in level, for instance if I have a drop of lets say 1 in 10 what speed would the water flow at, and if I decrease it too a drop if 1 in 20 would the speed decrease by half..

Yours Trevor

My email is tsatng1@yahoo.co.uk

Yours Trevor

My email is tsatng1@yahoo.co.uk

## Comment