The relation between Duty ‘D’ (in hectares/cumec), Delta ‘delta’ (in meters), and Base Period ‘B’ (in days) is:
Adelta = 8.64 * B / D
Bdelta = 8.64 * D / B
CD = 8.64 * delta / B
Ddelta = 864 * B / D
Explanation
Derivation: Delta (m) = (1 cumec * B days * 86400 sec) / (D * 104 m²) = 8.64 * B / D.

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