The Sensitivity of an Outlet Is Defined as the Ratio

The sensitivity of an outlet is defined as the ratio of the

A) rate of change of discharge of an outlet to the rate of change of discharge of the distributing channel
B) rate of change of discharge of an outlet to the rate of change in level of the distributing surface, referred to normal depth of the channel
C) depth of the sill or the crest level of the module below the full supply of the distributing channel to the full supply depth of the distributing channel
D) head recovered to the head put in an outlet