CIV E 445 - APPLIED HYDROLOGY SPRING 2003 DR. VICTOR M. PONCE HOMEWORK 7, CHAPTER 5
Problem 7-1 Given the following 2-h unit hydrograph for a certain catchment, find the 3-h unit hydrograph.
Using this unit hydrograph, calculate the 1-h unit hydrograph. Problem 7-2 The following 2-h unit hydrograph has been developed for a certain catchment:
A 6-h storm covers the entire catchment and is distributed in time as follows:
Calculate the composite hydrograph for the effective storm pattern, assuming a runoff curve number CN = 84. Problem 7-3 A certain basin has the following 2-h unit hydrograph:
Calculate the flood hydrograph for the following effective rainfall hyetograph:
Problem 7-4 Calculate the 50-y peak flow by the TR-55 graphical method for the following watershed data: (1) urban watershed, area A = 8.5 km2; (2) surface flow is shallow concentrated, paved; hydraulic length L = 3350 m; slope S = 0.01; (3) 48% of watershed is 1/3-ac lots, lawns with 85% grass cover, 34% total impervious, soil group C; (4) 52% of the watershed is 1/3-ac lots, lawns with 95% grass cover, 24% total impervious, 25% of it unconnected, soil group C; (5) Pacific Northwest region, 50-y 24-h rainfall P = 12 cm; 0.2% ponding. Problem 7-5 Use the computer program EH500 included to calculate the peak discharge for a 850-ha catchment with a 100-y 24-h rainfall P = 13 cm, time of concentration tc = 2.5 h, runoff curve number CN = 81, type I rainfall, and 1% pond and swamp areas.
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