A stormwater detention basin is estimated to have the following storage characteristics:
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| Stage (m) | Storage (m3) |
| 5.0 | 0 |
| 5.5 | 694 |
| 6.0 | 1525 |
| 6.5 | 2507 |
| 7.0 | 3652 |
| 7.5 | 4973 |
| 8.0 | 6484 |
The discharge weir from the detention basin has a crest elevation of 5.5 m and the weir discharge, Q, is given by the equation:
Q = 1.83H3/2
where Q is in m3/s and H is the height, in meters, of the water surface above the crest of the weir. The catchment runoff hydrograph is given by:
| Time (min) | 0 | 30 | 60 | 90 | 120 | 150 | 180 | 210 | 240 | 270 | 300 | 330 | 360 | 390 |
| Inflow (m3/s) | 0 | 2.4 | 5.6 | 3.4 | 2.8 | 2.4 | 2.2 | 1.8 | 1.5 | 1.2 | 1.0 | 0.56 | 0.34 | 0 |
The prestorm stage in the detention basin is 5.0 m meaning that there is no discharge at time 0 because the stage is below the weir crest. Using the storage-indication method, please find and/or show the following:
- The peak discharge from the basin in cubic meters per second
- The reduction in peak flow (peak outflow – peak inflow) in cubic meters per second
- Plot the outflow hydrograph and paste your figure below
- Plot the storage-indication curve and paste your figure below
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