B.€. (Part-Time) DEGREE EXAMINATIONS, APRIL/AMY 2014
Civil Engineering - Fourth Semester (Arrear)
Regulation R-2002/2005/2009
PTCE 374 / 334 / 9304- WATER SUPPLY ENGINEERING
Time: 3 Hrs
Maximum: 100 marks
Answer ALL questions
P A R T A ( 1 0 X 2 = 20 marks)
1.
2.
3.
4.
5.
6.
7.
8.
9
m
A
What are the objectives of municipal water supply projects?
What are the factors affecting run-off?
What are the advantages of pressure conduits than gravity conduits in water conveyance?
What are the factors affecting pipe corrosion?
Name the four types of settling of solids in water.
Distinguish between 'slow sand filter' and 'rapid sand filter'.
Differentiate 'sterilization' and 'disinfection' of water.
What is conventional method of removal of iron and manganese present in water?
What is residual pressure required at ferrule points of buildings as recommended by CPHEEO?
What are the types of distribution reservoirs?
PART B ( 5 X 1 6 = 80 marks)
11.
The population of a city obtained from census report is as given below.
1941
1951
1971
1981
1991
2001
2011
Year
1931
1961
Population
20000
22000 25000 27500 34100 41500 47050 54500 61000
Estimate the population of the city for the year 2031 by Arithmetical Increase method,
Geometrical Increase Method and Incremental Increase Method.
12(a)(i)Water has to be supplied to a town with 1.5 lakhs population at the rate of 200 litres per capita
per day from a river 2 km away. The difference in elevation between the lowest water level in
the sump and service reservoir is 40m. Determine the size of the main and power of the pump
required. Assume suitable data where required.
(10)
List and explain the factors to be considered in selecting pipe materials for water supply. (6)
(OR)
Design a pumping station to raise water from an intake well to a sedimentation tank with the
following data.
Water to be raised per day-18000 m , length of suction pipe-40 m, length of rising main-150 m,
Hazen-Williams roughness co-efficient-120, Diameter of suction and delivery pipe-0.5m, shifts
of working of pumps-2, Duration of each shift-8 hours, combined efficiency of motor and pump80%, static head through which water is to be raised-21m.
(10)
3
Draw a centrifugal pump characteristics curve and indicate the operating point and operating
range of the pump.
(6)
13(a) Design and draw a clariflocculator to treat 25 million litres of water per day. Make suitable
assumptions where necessary.
(OR)
(b) Design completely a rapid sand filter for a town having a total filtered water requirement of 6
million litres of water per day. Assume suitable data.
14(a) A sample of water contains 210 mg/L alkalinity, 55 mg/L hardness as CaCI and 75 mg/L
hardness as M g S 0 . Compute the quantities of lime and soda ash required to treat 1 million litres
of water. If in place of pure lime, slaked lime with 85% purity is available, find the required
quantity of slaked lime.
2
4
(OR)
(b)
List and Explain various water desalination methods.
15(a) Balance the following distribution network and obtain the flows in each of the pipes (stop with two
iterations). The length of the pipes is given in km and diameter of pipe is given as cm.
7m /min
2m /min
\
2km / 40 cm
1km 15 cm
1km 125 cm
2m /min <-
1 m /min
2km / 35 cm
0.75 km '20 cm
0.75km
/10 cm
2.km / 20 cm
1m /min
1 m /min
3
(OR)
(b)
Determine the storage required to supply the demand shown in the following table if the inflow
of water to the reservoir is maintained at a uniform rate throughout 24 hours. (Use mass curve
method and analytical method.)
Time (hours)
Demand
(million litres)
00-04
04-08
08-12
12-16
16-20
20-24
0.48
0.87
1.33
1.00
0.82
0.54