If Δ is the depth of water in m, B is the base period in days and D is the duty of water in hectare/cumec, then relation is

Question

Question

This question was previously asked in

UKPSC JE Civil 8 May 2022 Official Paper-II

Answer 1

Concept-

Duty-

Duty is defined as the number of hectares of land that is irrigated for the complete growth of a crop by supplying 1-meter cubes per second of water continuously throughout the crop or base period ‘B’ of the respective crop.
Duty gives a relation between the volume of water and the area of the crops that are harvested.

Delta-

It is defined as the total depth of water required by a particular crop to attain its maturity condition.
It is represented in cm.

Base Period-

The time period from the first watering of the crop during its sowing to the last watering of the crop before its harvesting is called a base period. It is also called a base of the crop.

The relationship between duty and delta is given by the formula:

\(\Delta = \frac{{8.64B}}{D}\)

Where \(\Delta \) = Delta in m

B = Base period and D = Duty