CE 4200 : Exam 1 CE4200 Fall 2013
Document Summary
Use the chen method to estimate total rainfall depth (inches) for the 50-year, 2-hour storm for a. A 2500 mi2 drainage basin receives 25 in/year rainfall. The discharge of the river at the basin outlet is measured at an average of 650 ft3/sec. Assume that the change in storage and seepage to groundwater for the system are essentially zero. Estimate the evapotranspiration (et) losses for the area in inches for the year. (1mi = 5280 feet, 1 ft = 12 inches, 1 year = 365 days) The idf curve for 10-year storms in los angeles, california, is given by i. 0. 51 t is the duration in minutes. where i is the average rainfall intensity in mm/hr and d. Determine time to peak (min) and peak intensity (mm/hr) for the triangular hyetograph, where the mean of the rainfall distribution is equal to 35% of the rainfall duration.
