A 3-hour unit hydrograph of a catchment is as given below. The ordinate of the S-curve derived from this unit hydrograph at time (t) = 9 hour will be ?
$\begin{matrix} Time (hour) & 0 & 3 & 6 & 9 & 12 & 15 ordinate (m^{3} / s) & 0 & 9 & 17 & 21 & 8 & 0 \end{matrix}$

62 cumec

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55 cumec

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47 cumec

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26 cumec

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Solution

The correct option is C 47 cumec
$\begin{matrix} Time & ordinate & Addition & S-Curve 0 & 0 & - & 0 3 & 9 & 0 & 9 6 & 17 & 9 & 26 9 & 21 & 26 & 47 12 & 8 & 47 & 55 15 & 0 & 55 & 55 18 & 0 & 55 & 55 \end{matrix}$

Ordinate of the S-Curve at time, t = 9 hour is
$= 47 m^{3} / s$

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