The characteristics of discharge below gates upstream radial stilling basin in
sloping channels have been discussed by same authors. In this research, a generalized
discharge equation was developed for free flow below gates upstream radial stilling basins in
both horizontal and sloping channels based which based on large series of experimental data.
The data were collected using a laboratory flume using different expansion ratios ranging
from 0.33 to 0.745. Accordingly, different basin lengths were used. The developed equation
predicted the discharge with maximum error of ±1%.