For a suppressed rectangular weir an arrangement for aera tion of nappe is necessary. (a) to…

For a suppressed rectangular weir an arrangement for aera
tion of nappe is necessary.

(a) to maintain water quality

(b) to prevent submergence of the weir

(c) to have the highest value of Cd

(d) to have a constant head-discharge relationship which is
independent of time.