CE 4200 Chapter : Exam 1 CE4200 Fall 2015
Document Summary
The numbers are in volumes of water and the unit is 1000 m3 (multiply numbers by 1000 m3). The area of the basin is 1. 2 km2. Evaporation is the output of the basin including snow, et (evapotranspiration), and the lake. Positive number in storage change indicates storage increase in that year. Negative number in storage change indicates storage decrease in that year. Use the water balance equation to calculate total outflow (m3) of the basin in the two years. Problem 2 (25 points) a rainfall record contains 50 years of measurements at 5-min intervals. The annual-maximum rainfall depths for intervals of 5 min, 10 min, 15 min, 20 min, 25 min, and 30 min are ranked in the table below. Use weibull method to calculate the rainfall intensity (mm/hr) for a storm of 20-year return period and 30-minute duration. See the figure at the back for a1, b1, and c1.
