The outflow from a detention pond is controlled by the SCS drop inlet shown in the sketch below. The quantities and elevations are as shown in the sketch in English units. Derive a headwater rating...

The outflow from a detention pond is controlled by the SCS drop inlet shown in the sketch below. The quantities and elevations are as shown in the sketch in English units. Derive a headwater rating curve up to elevation 45 ft for this structure assuming that when the pipe controls it is in barrel control (i.e., ignore the tail-water).