# Water Resources and Irrigation Engineering September 2010

CE 603 A/B Water Resources and Irrigation Engineering

(2002 Scheme)

I. (a) Determine optimum number Explain cyclonic precipitation.

The following data gives rainfall for five stations, of rain gauges, if the error is limited to 10% .

Station        :             A B C D E

Rainfall (mm) :     88 104 138 78 56

(b) Define unit hydrograph. What are the two important assumptions made? Explain the limitations of UH.

(c) Distinguish between surface run-off and sub-surface run-off.

OR

II. (a)Distinguish between convective precipitation and orographic precipitation.

(b)What are the factors affecting the run-off process?

(c) Rainfall data for five stations are given below. Find the Mean rainfall by Theissen Polygon method.

 Station A B C D E Area (Km2) 400 450 600 380 1 500 Rainfall (mm) 100 125 150 75 50

(d) What do you understand by infiltration index? How do you determine it? Specific capacity of well Interference among wells.

III. (a) Distinguish clearly between a shallow well and a deep well. How does a deep well differ from a tube well in confined aquifer ?

(b) Write notes on the following:

(i) Well loss

(ii) Spherical flow in well

OR

IV. (a) Describe with the help of sketches, some of the common types of strainers used in tube wells.

(b) Design a tube well for the following data :

(i) Yield required          = 0.2 cumec

(ii) Thickness of confined aquifer = 40 m

(i)  Radius of inch of influenc = 300 m

(iv) Permeability coefficient  = 80 m/day

(v) Draw down  = 6m

V. (a) Compare flow and lift irrigation. Explain the different methods of lift irrigation.

(b) Explain the methods of controlling reservoir sedimentation.

OR

VI. (a) Explain any four important factors affecting duty.

(b) Explain the hydrological investigations in a reservoir project. Explain the method of fixing the storage capacity of a reservoir.

VII. (a) What are high and low dams? Give the practical profile of a gravity dam.

(b) Derive Laplace equation for seepage through the homogeneous mass of an earth dam. What are its methods of solution?

OR

VIII. (a) Discuss in brief the causes of failure of earth dam.

(b) Design the practical profile of a gravity dam of stone masonry, given the following data :

R.L. of base of dam                    =1250 m

R.L. of H.F.L.                               =1280 m

Specific gravity of masonry = 2.4

Safe compressive stress for masonry of dam = 120 t/m2.

IX. (a) What are the various types of irrigation canals? Under what circumstances each is most suitable?

(b) The slope of a channel in alluvium is Lacey’s silt factor is 0.9. Channel side 5000

1 slope-H: IV. Find the channel section and the maximum discharge that can be

2 allowed through the channel.

OR

X.  (a) What is a siphon spillway? Sketch a saddle siphon spillway and explain the functions of its various component parts.

(b) Explain suspended load, bed load, Lacey’s silt factor and Manning formula.