What is the correct formula for Flow Time in an hour for an individual farmer?

Civil Engineering : Irrigation - Quiz(MCQ)

FT for the unit area + (his bharai â€“ his jharai)

FT for the unit area â€“ (his bharai â€“ his jharai)

(FT for the unit area) x (area of farmerâ€™s fields) â€“ (his bharai â€“ his jharai)

(FT for the unit area) x (area of farmerâ€™s fields) + (his bharai â€“ his jharai)

Correct Answer : (FT for the unit area) x (area of farmerâ€™s fields) + (his bharai â€“ his jharai)

Explanation : The formula for the flow time an hour for an individual farmer after the allowance of Bharai and Jharai timings is –
(FT for the unit area) x (area of farmer’s fields) + (his bharai – his jharai)

Bharai is generally zero in case of the tail (i.e. the last farmer) and Jharai is usually zero for all except for the tail.

Recently Updated in Irrigation Questions

Which type of lining is mixed and placed under temperature?

Dry Stone Lining

Shotcrete Lining

Cement Concrete Lining

Asphaltic Concrete Lining

Correct Answer : Option (D) : Asphaltic Concrete Lining

Explanation : Asphaltic concrete lining has been under evolution. It is used in very few places. This concrete is a careful mixture of asphalt and graded stone aggregate, and is mixed and applied under elevated temperature. This is a flexible lining and readily confirms to subgrade.

Calculate hydraulic mean depth for concrete-lined channel to carry a discharge of 350 cumecs at a slope of 1 in 5000. The value of manning’s constant for the lining is 0.015. The side slopes of a channel may be taken as 1.5:1. Assume limiting velocity in the channel as 2m/sec.

2.20 m

2.40 m

2.60 m

2.80 m

Correct Answer : Option (D) : 2.80 m

Explaination : Using Manning’s equation: V = 1/n.R2/3.S½
2 = 1/0.015 x Râ…” x 1/5000½
R = 2.80 m.

What is the maximum permissible velocity in Cement concrete lining (Unreinforced) as per Indian Standards?

1.2 to 1.8 m/sec

2 to 2.5 m/sec

1.5 to 2 m/sec

1.5 to 2.5 m/sec

Correct Answer : Option (B) : 2 to 2.5 m/sec

Explanation : The maximum permissible velocity for unreinforced cement concrete lining is 2.0 to 2.5 m/sec. For Boulder lining, the maximum permissible velocity is 1.5 m/sec.