Irrigation Engineering — Summer 2023

What is the necessity of diversion head work? State different type of diversion head work.

Why canal fall is provided? Enlist different types of canal fall.

How water requirement of crops measured? Develop a relationship between duty and delta for a given base period.

What is water logging? What are the ill effects of water logging?

How does Lane’s weighted creep theory differ from Bligh’s creep theory? How creep length is to be determined in both the theories.

Agravity dam 60.00 m. high had 6.50 m top width. Upstream face of dam is vertical. Base width is 46.50 m. Downstream face is inclined from top of the dam. Calculate self weight of the dam and moment @ toe of the dam. Take sp weight of dam material and water equals to 24 and 10 KN/m3.

Agravity dam stores 70 m of water on upstream side and there is 10 m of water on downstream side. Base width of dam is 60 m and drainage gallery is located 12 m away from heel. Draw uplift pressure diagram and calculate total uplift force and its moment about toe.

What is khosla’s observation in design of permeable foundations?

Calculate the balancing depth of a channel section having bed width equal to 12 m and side slopes of 1:1 in cutting and 2.25:1 in filling. The bank embankments are kept 2.40 m higher than the ground level and crest width of bank is kept as 1.50 m.

What are the modes of failure of an earthen dam? Explain how to ensure safety against each mode.

Enlist factors to be considered while selecting site for a dam.

Write short note on: Alignment of canal

Design trapezoidal canal to carry a 5 m3/sec of water using Lacey’s theory. Take silt factor equal to 1. Also determine bed slope.

State the type and advantage of canal lining.

Narrate causes and preventive measures of water logging.

Weir is constructed to store 5 m of water on a 23 m horizontal floor. 6.50 m deep upstream and 7 m deep downstream piles are provided. Calculate floor1 thickness and uplift pressure at a point 10 m and 16 m away from the upstream end. Assume sp.gr of floor material = 2.24. Adopt Bligh’s theory.

Explain irrigation efficiency.

What is meant by limiting height of a gravity dam? Determine limiting height of a concrete gravity dam for (i) Allowable stress in concrete 3000 KN/m2 (ii) Specific gravity of concrete 2.4 and (iii) Specific weight of water 10 KN/m3.

What is meant by cross drainage work? Where it is provided? Enlist different types of cross drainage work and its suitability.

Differentiate between suspended load and bed load.

Discuss the various methods of assessment of irrigation water charges.

Discuss the effect of earthquake on a gravity dam. How to determine inertia force and hydrodynamic force.

Discuss salient features of Kennedy’s theory for design of canal.

Draw typical section of an earthen dam of 26 m height indicating the various parts of the dam.

Design trapezoidal concrete canal for following data a. Design discharge 225 m3/sec b. Bed slope 1 in 2500 c. Side slope 1:1 d. B/Dratio 4.20. e. Manning’s Coefficient 0.015