(a) m³/s A broad-crested weir is located in a wide prismatic channel with a bed surface slope of So=2×10 with a discharge per unit width of q=1.5 m The bed surface roughness has a Manning's coefficient of n is 0.015. Assuming per m width. that energy losses may be neglected (and no hydraulic jumps do occur):
(i) find the normal and critical flow depths and respective flow energies for this channel flow.
(ii) find the height of the weir, so that the flow over the weir will just obtain the critical flow depth.
(iii) find the flow depths just upstream the weir (approaching), at the weir, and downstream of the weir, for a weir height of 0.2 m.
(iv) find the flow depths just upstream the weir (approaching), at the weir, and downstream of the weir, for a weir height of 0.5 m.