GATE CE 2019 Set 2 — Question 60
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Water Resources Engineering → Hydrographs & Groundwater → Unit Hydrographs
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Question
The ordinates, , of a 2-hour unit hydrograph (i.e., for of effective rain), for a catchment are shown in the table.
A 6-hour storm occurs over the catchment such that the effective rainfall intensity is for the first two hours, zero for the next two hours, and for the last two hours. If the base flow is constant at , the peak flow due to this storm (in , round off to 1 decimal place) will be ________.
| (hour) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| () | 0 | 2 | 8 | 18 | 32 | 45 | 30 | 19 | 12 | 7 | 3 | 1 | 0 |
Correct answer
96.5 to 97.5
Solution
The storm consists of three 2-hour periods:
Calculating DRH values to find the peak:
Total Peak Flow .
1. to : Intensity
2. to : Intensity
3. to : Intensity
The Direct Runoff Hydrograph (DRH) is calculated by superimposing the unit hydrograph (UH) scaled by the effective rainfall of each period:Calculating DRH values to find the peak:
Total Peak Flow .
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