The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and 2 cm, respectively. The o index for the catchment is taken as 0.2 cm/hour. The 2 hour unit hydrograph ordinates are given in table below. 0 2 46 8 10 Time in hrs. 12 14 16 Discharge m'isec 0 10 40 70 50 20 10 6 Base flow can be taken as 7 m/sec at the beginning of the storm linearly increasing to 9 m3/sec at 10 Hrs. after the beginning and then linearly decreasing to 8 m2/sec at 4 Hrs. after the end of direct run off. Compute the resultant flood hydrograph.
The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and 2 cm, respectively. The o index for the catchment is taken as 0.2 cm/hour. The 2 hour unit hydrograph ordinates are given in table below. 0 2 46 8 10 Time in hrs. 12 14 16 Discharge m'isec 0 10 40 70 50 20 10 6 Base flow can be taken as 7 m/sec at the beginning of the storm linearly increasing to 9 m3/sec at 10 Hrs. after the beginning and then linearly decreasing to 8 m2/sec at 4 Hrs. after the end of direct run off. Compute the resultant flood hydrograph.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and
2 cm, respectively. The o index for the catchment is taken as 0.2 cm/hour. The 2 hour unit hydrograph
ordinates are given in table below.
Time in hrs.
4
6.
8
10
12
14
16
Discharge m'isec o
10
40
70
50
20
10
6.
Base flow can be taken as 7 m/sec at the beginning of the storm linearly increasing to 9 m/sec at
10 Hrs. after the beginning and then linearly decreasing to 8 m/sec at 4 Hrs. after the end of direct
run off. Compute the resultant flood hydrograph.
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