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Posted By: Sri Member Level: Gold Posted Date: 13 Dec 2007
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2006 Jawaharlal Nehru Technological University B.Tech Civil Engineering III/Sem1 Regular (NOV)Set 1,Water Resources Engineering-I Question paper
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Code No: RR310102 Set No. 1
III B.Tech I Semester Regular Examinations, November 2006
WATER RESOURCES ENGINEERING-I
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Define Irrigation. What is the necessity of irrigation.
(b) Describe in brief some of the important irrigation projects and multipurpose
river valley projects undertaken or completed after independence of our coun-
try. [8+8]
2. (a) Define outlet factor, capacity factor, full supply coefficient and root zone
depth.
(b) The CCA for a distributory is 15000 ha. The intensity of irrigation is 40%
for rabi and 10% for rice. If kor period is 4 weeks for rabi and 2.5 weeks for
rice, determine the outlet discharge. Outlet factor for rabi and rice may be
assumed as 1800 ha/m3/sec and 775 ha/m3/sec. What is design discharge of
distributory head at 10% conveyance. [8+8]
3. (a) Hydrology is a highly interdisciplinary science. Justify.
(b) Describe the hydrologic cycle with a neat sketch. [8+8]
4. (a) What do you mean by Antecedent precipitation index. Explain.
(b) List out and explain various physiographic factors affecting runoff. [8+8]
5. (a) Distinguish between:
i. Vadose zone and phreatic zone
ii. Aquiclude and Aquitard
iii. Transmissivity and storativity
(b) An unconfined aquifer has an areal extent of 15 km2. When 9.5 million cubic
meters of water was pumped out, the water table was observed to go down
by 2.4 m. What is the specific yield of the aquifer? If the water table of the
same aquifer rises by 12.5 m during a monsoon season, what is the volume of
recharge? [9+7]
6. (a) What is the necessity of drainage below the lining. Discuss the various drainage and pressure release arrangements.
(b) Using Lacey’s basic regime equations, derive an expression for Lacey’s scour
depth. [8+8]
7. (a) Draw a typical cross section of a barrage founded on pervious foundations and explain its salient features.
(b) What is meant by scour. What precautions do you take against it during the
design of weirs. [8+8]
8. (a) What do you understand by critical gradient. What will happen if the critical
gradient is exceeded. What is Khoslas safe exit gradient.
(b) Explain how Khoslas theory is modification over Bligh’s theory. [8+8]
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