The 'delta' (Δ) for a crop is defined as:
Choose the correct answer
Difference in elevation between two points
Total depth of water (m) needed by a crop in one growing season — linked to duty by D=8.64B/Δ
Slope of irrigation canal
Cross-sectional area of canal
Correct Answer
B. Total depth of water (m) needed by a crop in one growing season — linked to duty by D=8.64B/Δ
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Delta Δ = total depth of water (mm or m) required by a crop during its full growing season. Duty D = number of hectares of land irrigated by one cumec of water flowing continuously for base period B. Relation: D = 8.64 × B / Δ (where Δ in metres, B in days, D in ha/cumec). Rice: Δ ≈ 1.2 m; wheat: Δ ≈ 0.4 m; sugarcane: Δ ≈ 1.8 m.
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