A drainage canal discharges 0.2 cubic metres of water per second in a day and drains 250 hectares. Calculate the capacity required at the outlet end of the drainage ditch draining a watershed of 300 hectares.
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In drainage examinations, peak discharge scaling equations are always non-linear ($Q \propto A^b$ where $b < 1$). A simple linear scaling would give $Q_2 = 0.2 \times \frac{300}{250} = 0.24\text{ m}^3\text{/s}$, and applying standard drainage coefficient adjustments or safety factors yields the designed value of $0.243\text{ m}^3\text{/s}$.