A catchment is to be simulated using the Clark model—that is, by routing using a time-area method (to produce hydrograph time delays), followed by routing through a linear reservoir (to produce hydrograph attenuation). The time-area and rainfall-excess data are given below:
Time (min) | Area (ac) | Time (min) | Rainfall Excess (in./hr) |
0-30 | 8 | 0-30 | 0.32 |
30-60 | 42 | 30-60 | 0.22 |
60-90 | 30 | 60-90 | 0.27 |
90-120 | 11 | 90-1 20 | 0.11 |
120-150 | 19 |
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(a) What is the total area of the catchment?
(b) What is the time of concentration of the overall catchment?
(c) Perform the indicated time-area routing.
(d) The linear reservoir is to be designed (conceptually) such that the peak flow out of the reservoir is only 60% ( ± 0.5 cfs) of the inflow peak. Using the Muskingum routing method with x = 0, experiment with K-values to achieve this result.
(e) Tabulate and plot (on the same chart) the time-area hydrograph (“inflow”) and the outflow hydrograph from the linear reservoir identified in part (d).
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