If base period is 150 days and delta is 0.6 m, duty is

Why is this the answer?

In irrigation engineering, Duty (D) = 8.64 × B / Δ, where B is base period (days) and Δ is delta (m of water depth). B = 150 days, Δ = 0.6 m. D = 8.64 × 150 / 0.6 = 2160 ha/cumec ha/cumec. Duty means the area (hectares) that 1 cumec of water can irrigate throughout the base period.

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