If duty (D) is 1428 hectares/cumec and base period (B) is 120 days for an irrigated crop, then delta (Δ) in metres is given by

Option 2 : 0.73

CT 10: Soil Mechanics

3946

10 Questions
10 Marks
10 Mins

__Concept:__

Duty: It is the number of hectares of land irrigated for full growth of a given crop by a supply of 1 cumec of water continuously during the entire base period of that crop.

Delta: The total water depth required by a crop to attain its full maturity in its base period.

Base Period: The time period that elapsed from the instant of the showing of the crop to the instant of its harvesting is called the base period or crop period.

The relation between Duty (D), Delta (Δ), and Base period (B) is given as:

\({\bf{\Delta }}\left( {{\bf{metres}}} \right) = \frac{{8.64B}}{D}\)

B - Base period (days)

D - Duty of water (hectare/cumec)

__Calculation:__

Given:

B = 120 Days, D = 1428 hectares/cumec

\(\Delta = \frac{{8.64B}}{D} = \frac{{8.64 \times 120}}{{1428}} = 0.73\ m \).