(25 Points) A rectangular sharp crested weir 3 ft high isto be constructed in a natural channel in the vicinity of agaging station for streamflow measurements. The crestlength of the weir is b from Problem 1 and extends acrossthe full width of the channel. The design discharge forthe channel is Q from Problem 1. For an initialcalculation, neglect the approach velocity and determinethe head on the weir under design flow conditions. Is thisassumption valid? If not, recalculate the head on the weirincluding the effects of the approach velocity