The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and 2 cm, respectively. The 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. 0 2 4 6 8 10 12 Discharge m³/sec 0 10 40 70 50 20 10 Base flow can be taken as 7 m³/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 m³/sec at 4 Hrs. after the end of direct run off. Compute the resultant flood hydrograph. 14 16 6 0
The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and 2 cm, respectively. The 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. 0 2 4 6 8 10 12 Discharge m³/sec 0 10 40 70 50 20 10 Base flow can be taken as 7 m³/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 m³/sec at 4 Hrs. after the end of direct run off. Compute the resultant flood hydrograph. 14 16 6 0
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and
2 cm, respectively. The 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.
Discharge m
0
2
4
m³/sec 0 10 40
6
14 16
70 50
20 10 6 0
Base flow can be taken as 7 m³/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 m³/sec at 4 Hrs. after the end of direct
run off. Compute the resultant flood hydrograph.
8 10 12](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F892585bf-8938-4a24-8285-fef165732e5f%2F6d1cee70-b078-4440-bc1b-747952888e70%2Fxwk42wi_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and
2 cm, respectively. The 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.
Discharge m
0
2
4
m³/sec 0 10 40
6
14 16
70 50
20 10 6 0
Base flow can be taken as 7 m³/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 m³/sec at 4 Hrs. after the end of direct
run off. Compute the resultant flood hydrograph.
8 10 12
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