Example 3. The ordinates o fa 6-hour unit hydrograph o fa catchment is given below. 36 Time (h) Ordinate 3 9 12 15 18 24 30 42 48 of 6-h UH 25 50 85 125 160 185 160 110 60 36 25 Time (h) Ordinate 54 60 69 of 6-h UH 16 8. Derive the flood hydrograph in the catchment due to the storm given below:
Example 3. The ordinates o fa 6-hour unit hydrograph o fa catchment is given below. 36 Time (h) Ordinate 3 9 12 15 18 24 30 42 48 of 6-h UH 25 50 85 125 160 185 160 110 60 36 25 Time (h) Ordinate 54 60 69 of 6-h UH 16 8. Derive the flood hydrograph in the catchment due to the storm given below:
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![Example 3. The ordinates o fa 6-hour unit hydrograph o fa catchment is given below.
Time (h)
Ordinate
3
9.
12
15
18
24
30
36
42
48
of 6-h UH
25
50
85 125 160 185 160
110
60
36
25
Time (h)
54
60
69
Ordinate
of 6-h UH
16
8 0
Derive the flood hydrograph in the catchment due to the storm given below:
Time from start of storm (h)
Accumulated rainfall (cm)
12
18
3.5
11.0
16.5
The storm loss rate (O index) for the catchment is estimated as 0.25 cm/h. The base flow
can be assumed to be 15 m³/s at the beginning and increasing by 2.0 m³/s for every 12
hours till the end of the direct-runoff hydrograph.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcb4cdac3-350b-487e-9f86-44ec64de9557%2F16855f8f-e9c7-470d-9abf-437e0af1c6dc%2F70sgmm_processed.png&w=3840&q=75)
Transcribed Image Text:Example 3. The ordinates o fa 6-hour unit hydrograph o fa catchment is given below.
Time (h)
Ordinate
3
9.
12
15
18
24
30
36
42
48
of 6-h UH
25
50
85 125 160 185 160
110
60
36
25
Time (h)
54
60
69
Ordinate
of 6-h UH
16
8 0
Derive the flood hydrograph in the catchment due to the storm given below:
Time from start of storm (h)
Accumulated rainfall (cm)
12
18
3.5
11.0
16.5
The storm loss rate (O index) for the catchment is estimated as 0.25 cm/h. The base flow
can be assumed to be 15 m³/s at the beginning and increasing by 2.0 m³/s for every 12
hours till the end of the direct-runoff hydrograph.
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