RollNo. : :...........

Total No. of Questions: 09] [Total No. of Pages : 03

B.Tech.. (Sem. -7th/8th)

HYDROLOGY AND DAMS

SUBJECT CODE: CE -402

. Paper ID : [A0624]lNote: Please fillsubject code and paper ID on OMR]

/

Time: 03 Hours

Instruction to Candidates:

1) Section -A is Compulsory.

2) Attempt any Fo-"r questions from Section - B.3) Attemptany 1\vo questionsftom Section- C.

Maximum Marks: 60

Section -A

Ql) (10 x 2 =20)

a) What do you understand by rainfa~lintensity?

b) What is precipitation?

c) Definepotential evapotranspiration?

d) Whatis transpiration?

"e) Definehydrograph?

f) Defineunit hydrograph?

g) What do you understand by the term 'mean annual flood'?

h) What is meant by the elementary profile of a gravity dam?

i) What are spillways?

j) Define an arch dam and a double arch dam.

Section - B

(4 x 5 =20)

Q2) Explain briefly the following relationship relating to the precipitation over abasin: . .

Intensity - Duration - Frequency relationship.

Q3) What is a unit hydro graph? List the assumptions involved iri the unithydrograph theory. .

M-694 1'859/ P.T.O."

Q4) The maximum annual observed floods for 20 years from 1960 to 1979 for acatchment are givenbelow. Determine the maximum flood with a recurrenceinterval of30 years by Gumbel's method.

Q5) What are different load combinations to be considered for the design of agravity dam as per IS code? Discuss in brief the main forces in load

. \

combinations A and B.

Q6) Write short note on buttress dams and multiple arch dams..

Section - C

(2 x 10 =20)

Q7) The ordinates ofa unit hydrograph of6-hr duration are given below at 2-hrinterval. Compute the ordinates of the S-curve and hence derive the unithydrograph of 4-hr duration. '

Q8) (a) Explain in details the various forces causing instability in a gravity dam?

(b) What are different assumptions made in the stability of analysis of agravity dam?

M-694 2

Year 1960 1961 1962 1963 1964 1965 J966 1967 1968 1969

Discharge . 1.38 1.25 1.92 1.45 1.63 1.43 1.84 1.72 1.32 1.86'

(lakh)(cumecs)

Year 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979

Discharge 1.20 1.82 1.70 1.95 1.60 1.32 1.41 1.78 1.80 1.50

(lakh)(cumecs)

.Time 0 2 4 6 8 10 12 14 16 18

(hrs)

Discharge 0 3Q.0 1000 2100 3500 5600 8500 10500 10000 7800

(cumec)

Time 20 22 24 26 28 '30 32 34 36 38

(hrs)

Discharge 5700 4800 4100 3440 2700 2140 1500 500 300 0

(curnec )

Q9) (a) What are spillways? And what is their necessity?

(b) Briefly discuss different forms of precipitation.

IRIIRIIRIIR1

M-694 3