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Hydrology & Irrigation

S-Curve Method-Part-3

The ordinates...

Question

The ordinates of a two hour unit hydrograph at sixty minutes time interval starting from time t = 0 are $0, 1.5, 5.5, 10, 9, 4.5, 1.5 and 0 m^{3} / s$ . The maximum ordinate of one hour unit hydrograph would be __________ [Rounded upto two decimal places]
12

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Solution

The correct option is A 12
$\begin{matrix} Time & 2 - h r & Lag 2 hr & S_{A} - Curve & S_{B} - Curve & S_{A} - S_{B} & Ordinate of 1-hr UH UH & S-curve Addition & Lag-1hr & = \frac{S_{A} - S_{B}}{(1 / 2)} \times 1 c m 0 & 0 & - & 0 & - & 0 & 0 1 & 1.5 & - & 1.5 & 0 & 1.5 & 3 2 & 5.5 & 0 & 5.5 & 1.5 & 4 & 8 3 & 10 & 1.5 & 11.5 & 5.5 & 6 & 12 4 & 9 & 5.5 & 14.5 & 11.5 & 3 & 6 5 & 4.5 & 11.5 & 16 & 14.5 & 1.5 & 3 6 & 1.5 & 14.5 & 16 & 16 & 0 & 0 7 & 0 & 16 & 16 & 16 & 0 & 0 \end{matrix}$

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