Key points are not available for this paper at this time.
Climate change has made flash floods increasingly common. It's crucial to have confidence in the structural integrity of dams during a flash flood. According to the International Commission on Large Dams (ICOLD), approximately one-third of dam failures are attributed to inadequate spillway capacity. The current study aims to compare the discharge of slit weirs with that of ogee spillways and sharp-crested weirs. Various experiments were conducted using rectangular slit weirs with different opening ratios ( b/B = 2/24, 3/24, 4/24, 5/24, 6/24, 7/24, 8/24, and 10/24). The results indicate that ogee spillways have an average discharge capacity of 13–68 times greater than that of the slit weirs, while sharp-crested weirs have a discharge capacity of 1.39–7.3 times that of the slit weirs. The ratio of ogee spillway discharge to the slit weir ( r ) and sharp-crested weir discharge to the slit weir ( r' ) increases with the rise of h/P . Moreover, the highest average values of r and r' are observed at b/B = 2/24, measuring 65.46 and 7.3, respectively. Conversely, the lowest values, 11.53 and 1.22, are associated with b/B = 10/24. Notably, the maximum values of r and r' , 71.2 and 7.61, respectively, also occur at b/B = 2/24.
Anzani et al. (Fri,) studied this question.