In this paper, two methods are presented to analyse the free overfall in δ-shaped (equilateral triangle-shaped) channels.
First, the flow upstream of a free overfall from smooth horizontal or mildly sloping Δ-shaped channels is analysed theoretically
to determine the end-depth-ratio (EDR), applying the momentum equation based on the Boussinesq approximation. Second, an alternate
method for ... [Show full abstract] analysing free overfall in Δ-shaped channels is also presented where the flow over a free overfall in a Δ-shaped
channel is simulated by that over a sharp-crested weir to calculate the EDR. The method of estimation of discharge from the
known end depth is also presented for both the methods. These approaches eliminate the need of an experimentally determined
pressure coefficient. Experiments are conducted to verify the results obtained from the present methods. Comparisons of the
computed and experimental results are satisfactory