How to Calculate Discharge of The Water If The Depth & Crop Period are Given
Mathematical Problem
A Waterhouse has a culturable commanded area of 2200 hectares. The intensity of irrigation for crop A is 50% and for B is 35%, both the crops being Rabi crops. Crop A and B have a crop period of 25 days and 20 days respectively. Calculate the discharge of the water if the or depth for crop A and B is 12 cm and 18 cm respectively.
Solution:
Culturable land for irrigation = 2200 hectares.
Area of irrigation for Crop A = 2200 × 50% = (2200 × 50)/100 = 1100 hectares.
Area of irrigation for Crop B = 2200 × 35% = (2200 × 35)/100 = 770 hectares.
Using the relation.
D = (8.64 × B)/ ∇
Discharge for crop A
Here,
- ∇ = 12 cm = 0.12 m.
- B = 25 days
Duty (D) = (8.64 × 25)/0.12 = 1800 hectares/cumec.
Required discharge for crope A = (1100/1800) = 0.61 cumec.
Discharge for crop B
Here,
- ∇ = 18 cm = 0.18 m
- B = 20 days
Duty (D) = (8.64 × 20)/0.18 = 960 hectares/cumec.
Reaquired discharge for crop B = ( 770/960) = 0.80 cumec.
S0, the total discharge of water course = (0.61 + 0.80) = 1.41 cumec.
Read More:
Relation Between Base, Delta and Duty
Factors Affecting Duty of Water
Determine the Discharge of the Channel for which it is to be Designed
