53:078 Principles of Hydrology (Spring 2004)
Problem #20
Hydrograph Analysis for Ralston Creek Flood (July 1972)
Do a hydrograph analysis to determine the direct runoff characteristics for the North Branch Ralston Creek (drainage area of 3.01 square miles) during the flood on 17-18 July 1972. The direct runoff hydrograph estimated for this event (by baseflow separation using a digital filter) is available. The areal average rainfall estimates (based on the Thiessen polygon method) are also available. Use this information to compute the following:

  1. Volume of direct runoff Vd (cfs-hours)
  2. Depth of direct runoff rd (in)
  3. The f-index (in/hr)
  4. The rainfall excess Pe hyetograph (in)
  5. The effective storm duration tr (hours)
  6. The runoff coefficient C
Last changed on 03/25/04 by aab.