For base period 120 days and duty 600 ha/cumec, delta is

Why is this the answer?

Delta (Δ) is total depth of water (m) required by a crop during its base period. Δ = 8.64 × B / D, where B = base period (days) and D = duty (ha/cumec). B = 120 days, D = 600 ha/cumec. Δ = 8.64 × 120 / 600 = 1.73 m m. Duty and delta are inversely related: a crop needing more water per unit area will have lower duty.

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