Question

4-23. Determine the unit hydrograph ordinates for the Isosceles River with the stream flow data shown in Figure P-4-23 on page 192. The basin area is 14.40 km', and the unit duration of the storm is 1 hour. For ease of com- putation, locate ordinates at hourly intervals, that is, 1500, 1600, and 1700 hours. Note that the time is military time; that is, 1500 h 3 PM, 2000 h 8 PM, etc.

Answer 1

DRH 2. 7oo 800 600 Time h , t - DRH DRH

Base DRH Time Total odiate 800 luOO - 1500 5400 500-600 5400 2. 1600 1700 O. 5 800 olwme st8m 3 !4400 ㎡ O.I om DRH hdinate stsm dapth 3

aXe 7OO 500- 600 1 400 200 -1500 lboo 15 15