A 136-acre watershed of unimproved land use has a t, of 80 min. Use the Rational Method to compute the frequency curve. Using the 2-yr event as the index flood, compute moment ratios for return...

A 136-acre watershed of unimproved land use has a t, of 80 min. Use the Rational Method to compute the frequency curve. Using the 2-yr event as the index flood, compute moment ratios for return periods for 5, 10, 25, 50, and 100 yr. Compare the values with those given in Section 7.4.