1. The problem statement, all variables and given/known data A 4m wide channel has a bed slope of 1 in 1500 and a Manning's roughness coef n=0.01. A broad crested measuring weir in the form of a streamlined hump 0.4m high spans across the full width of the channel. the discharge is 10.5m^3/s. Determine i)the uniform depth of flow iv)the depth of water on the weir, is this critial 2. Relevant equations Mannings equation: Q=A^(5/3)*(S)^(1/2)/(n*P^(2/3)) where A is cross sectional area, S is bed slope, P is wetted perimeter Bernoulli equation elevation+(v^2)/(2*g)=constant (i ignore pressure head here as im working on surface so use atmospheric pressure as zero) Specific energy - E=d+(Q/w)^2/(2*g*d^2) where d is the depth and w is the width 3. The attempt at a solution i use mannings equation to determine the depth and i get 1.22m, but then when i try and find the depth on top of weir i get nowhere, in face if i work out the minimum possible specific energy i get 1.333 and on top of the weir i get 1.05, so im clearly going wrong somewhere. any help anyone??