A detention basin will be built at the outlet of a 75-acre watershed. The stage-storage relationship for the planned basin is given in the table below. A weir type outlet with crest at elevation 101 ft will be used. The 25-year peak runoff rate from the watershed is 360 cfs, and this should be reduced to 180 cfs at the detention basin outlet. If themaximum storage volumeneeded forthe basin is5 acre-ft, determine the size of theoutlet weir. ### Stage-Storage Relationship TableThis table provides data on the relationship between water stage height (in feet) and the corresponding water storage volume (in acre-feet).| Stage (ft) | Storage (acre-ft) ||------------|-------------------|| 100 | 0.00 || 101 | 0.60 || 102 | 1.25 || 103 | 1.92 || 104 | 2.80 || 105 | 3.90 || 106 | 6.00 |- **Stage (ft):** Represents the height of the water surface above a reference point, measured in feet.- **Storage (acre-ft):** Represents the volume of water stored at each stage height, measured in acre-feet.This data is essential for understanding how changes in water level impact storage capacity, often used in flood management, reservoir operations, and environmental studies.

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Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A detention basin will be built at the outlet of a 75-acre watershed. The stage-storage relationship for the planned basin is given in the table below. A weir type outlet with crest at elevation 101 ft will be used. The 25-year peak runoff rate from the watershed is 360 cfs, and this should be reduced to 180 cfs at the detention basin outlet. If themaximum storage volumeneeded forthe basin is5 acre-ft, determine the size of theoutlet weir.

### Stage-Storage Relationship Table

This table provides data on the relationship between water stage height (in feet) and the corresponding water storage volume (in acre-feet).

| Stage (ft) | Storage (acre-ft) |
|------------|-------------------|
| 100 | 0.00 |
| 101 | 0.60 |
| 102 | 1.25 |
| 103 | 1.92 |
| 104 | 2.80 |
| 105 | 3.90 |
| 106 | 6.00 |

- **Stage (ft):** Represents the height of the water surface above a reference point, measured in feet.
- **Storage (acre-ft):** Represents the volume of water stored at each stage height, measured in acre-feet.

This data is essential for understanding how changes in water level impact storage capacity, often used in flood management, reservoir operations, and environmental studies.

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