Download Visvesvaraya Technological University (VTU) BE ( Bachelor of Engineering) Civil Engineering 15 Scheme 2020 January Previous Question Paper 7th Sem 15CV742 Groundwater and Hydraulics

USN

,

V.

LIBRARY

,

CHIKOC;

15CV742

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Seventh Semester B.E. Degree Examination, De

Groundwater and Hydraulics

Time: 3 hrs. Max. Marks: 80

Note: Answer any FIVE full questions, choosing ONE full question

.

from each inodnle.

U

U

"Z

Module-1

-- ,;

E I a. With a neat sketch, explain the vertical distribution of Ground water. (08 Marks)

b. Explain in brief the occurrence of Ground water in different types of rocks and soils.

.

0 (08 Marks)

1)

vi

a)

tu az

tO

OR

.

1

)

-- 2 a. Explain the importance of Ground water. (08 Marks)

Fi

b. What is an aquifer? Explain different types of Aquifers, with a neat sketch. (08 Marks)

11

r: DC

? _

Module-2

r' /

=

?

I'

' ?:-. r,i,

3 a. Define Specific yield , Specific retention and Porosity. Derive a relationship between them.

(08 Marks)

0

.,

b. It is observed in a field test that 3 hr 20 min was required for a tracer to travel from one well

: ...- ,

., to another 20m apart and the difference in their water surface elevations was 0.5m samples

a

.

c

,

of the aquifer between the wells indicated a porosity of 15%. Determine the permeability of

r; g

0-

the aquifer seepage velocity and the Reynolds number for the flow assuming an average

TG ;5 grain size of 1 mm and kinematic viscosity of water at 27

?

C is 0.008 stoke. (08 Marks)

5 -a

..,... . c3

"G". -., -

OR

... -

Fr. c

4 a. With a neat sketch, explain Darcy's law discuss its validity and limitations. (08 Marks)

>

c , b. Derive an expression for one dimensional steady flow in homogenous unconfined aquifer.

?,:; c

(08 Marks)

Module-3

0 ,..,

6 . :'

5 a. What are the assumptions made in their method? Explain Thei's method to determine

8 formation constants T and S for unsteady radial flow towards well.

En vg

(06 Marks)

b. Derive the discharge equation for steady radial flow into a well in a confined aquifer.

), ,...

7 5'

(06 Marks)

2

rm o c. A tube well of 30cm diameter penetrates fully in an artesian aquifer. The strainer length is

. 0 va

15

.E

15m. Calculate the yield from the well under a drawdown of 3m. The aquifer consists of

E

s

and of effective size of 0.2mm having coef ficient of permeability equal to 50m/day.

>, Assume radius of drawdown equal to 150 meters. (04 Marks)

8 .:

--: (-4

OR

0 6 a. Explain Cooper Jacob methods of solutions for unsteady radial flow in a confined aquifer.

(08 Marks)

0

b. A 30 cm well penetrates 49.99m below the static water table. After a long period of pumping

at a rate of 1799 fpm, the drawdown in the wells at 15 and 44.99m from the pumped well

were 1.69 and 0.79m respectively. Determine the transmissibility of the aquifer. What is the

drawdown in the pumped well? (08 Marks)

l oft

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1M WM

USN

,

V.

LIBRARY

,

CHIKOC;

15CV742

0? c,o)

r

/

'

9

9e of ..., ' - / E

ms

?'

Seventh Semester B.E. Degree Examination, De

Groundwater and Hydraulics

Time: 3 hrs. Max. Marks: 80

Note: Answer any FIVE full questions, choosing ONE full question

.

from each inodnle.

U

U

"Z

Module-1

-- ,;

E I a. With a neat sketch, explain the vertical distribution of Ground water. (08 Marks)

b. Explain in brief the occurrence of Ground water in different types of rocks and soils.

.

0 (08 Marks)

1)

vi

a)

tu az

tO

OR

.

1

)

-- 2 a. Explain the importance of Ground water. (08 Marks)

Fi

b. What is an aquifer? Explain different types of Aquifers, with a neat sketch. (08 Marks)

11

r: DC

? _

Module-2

r' /

=

?

I'

' ?:-. r,i,

3 a. Define Specific yield , Specific retention and Porosity. Derive a relationship between them.

(08 Marks)

0

.,

b. It is observed in a field test that 3 hr 20 min was required for a tracer to travel from one well

: ...- ,

., to another 20m apart and the difference in their water surface elevations was 0.5m samples

a

.

c

,

of the aquifer between the wells indicated a porosity of 15%. Determine the permeability of

r; g

0-

the aquifer seepage velocity and the Reynolds number for the flow assuming an average

TG ;5 grain size of 1 mm and kinematic viscosity of water at 27

?

C is 0.008 stoke. (08 Marks)

5 -a

..,... . c3

"G". -., -

OR

... -

Fr. c

4 a. With a neat sketch, explain Darcy's law discuss its validity and limitations. (08 Marks)

>

c , b. Derive an expression for one dimensional steady flow in homogenous unconfined aquifer.

?,:; c

(08 Marks)

Module-3

0 ,..,

6 . :'

5 a. What are the assumptions made in their method? Explain Thei's method to determine

8 formation constants T and S for unsteady radial flow towards well.

En vg

(06 Marks)

b. Derive the discharge equation for steady radial flow into a well in a confined aquifer.

), ,...

7 5'

(06 Marks)

2

rm o c. A tube well of 30cm diameter penetrates fully in an artesian aquifer. The strainer length is

. 0 va

15

.E

15m. Calculate the yield from the well under a drawdown of 3m. The aquifer consists of

E

s

and of effective size of 0.2mm having coef ficient of permeability equal to 50m/day.

>, Assume radius of drawdown equal to 150 meters. (04 Marks)

8 .:

--: (-4

OR

0 6 a. Explain Cooper Jacob methods of solutions for unsteady radial flow in a confined aquifer.

(08 Marks)

0

b. A 30 cm well penetrates 49.99m below the static water table. After a long period of pumping

at a rate of 1799 fpm, the drawdown in the wells at 15 and 44.99m from the pumped well

were 1.69 and 0.79m respectively. Determine the transmissibility of the aquifer. What is the

drawdown in the pumped well? (08 Marks)

l oft

15CV741,

Module-4

7 a. Explain with a neat sketch, the Electrical resistivity (surface) method for ground water

exploration.

(08 Marks)

b. Explain the Sonic logging with equation. (08 Marks)

OR

8 a. Explain with a neat sketch the Seismic Refraction method for Ground water exploration.

(08 Marks)

b. With a neat sketch, Electric logging for Ground water Exploration. (08 Marks)

Module-5

9 a. Explain the different types of wells also give the method of construction for any one of the

well.

(08 Marks)

b. With the neat sketches, explain the various methods of Ground water recharge. (08 Marks)

OR

10 a. Ocplain what is conjunctive use of water also explain its necessity , technique involved of

economics.

(08 Marks)

b. Describe what are the pumps used for lifting water from wells, also explain the working

principle of centrifugal pump.

(08 Marks)

*

2 of 2

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This post was last modified on 02 March 2020