Discharge characteristics of a typical box-inlet drop spillway are given in Figure 9-4.
A stilling basin for the box-inlet drop spillway is shown in Figure 9-7.
2 Determine the design dimensions for the drop spillway in Problem 9.
3 Determine the crest length for a straight-inlet drop spillway to carry 7.
Drop spillways are installed in channels to establish permanent control elevations below which an eroding stream cannot lower the channel floor.
with no submergence) capacity for drop spillways is given by the weir formula (Chapter 6)
Inlets may be similar to those for straight-inlet or box-inlet drop spillways, for which the capacity formulas already discussed will apply.