Route the inflow hydrograph in Problem 1 to the outlet of the 30-mi reach using the HEC-1 straddle-stagger method by lagging averaged pairs of Rows two lime increments (12 hr). Compare the routed and measured outflow rates.
Problem 1
Given the following values of measured discharges at both ends of a 30-mi river reach:
(a) Determine the Muskingum K and X values for this reach.
(b) Holding K constant (at your determined value), use the given inflow hydrograph to determine and plot three outflow hydrographs for values of X equal to the computed value, 0.5, and 0. Plot the actual outflow and numerically compare the root mean square of residuals when each of the three calculated hydrographs is compared with the measured outflow.
Time | Inflow (cfs) | Outflow (cfs) |
6 a.m. | 10 | 10 |
Noon | 30 | 12.9 |
6 p.m. | 68 | 26.5 |
Midnight | 50 | 43.1 |
6 a.m. | 40 | 44.9 |
Noon | 31 | 41.3 |
6 p.m. | 23 | 35.3 |
Midnight | 10 | 27.7 |
6 a.m. | 10 | 19.4 |
Noon | 10 | 15.1 |
6 p.m. | 10 | 12.7 |
Midnight | 10 | 11.5 |
6 a.m. | 10 | 10.8 |
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