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Name
Reg No A
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
07 THRISSUR CLUSTER
THIRD SEMESTER M.TECH. DEGREE EXAMINATION DEC 2017
Civil Engineering
Environmental Engineering/Water Resources Hydroinformatics
07CE7111 PLANNING DESIGN OF ENVIRONMENTAL FACILITIES
Time 3 hours Max.Marks: 60
Answer all six questions. Part of each question is compulsory.
Answer either part or part of each question
Q.no. Module 1 Marks
1a How will you estimate the quantity of water to be stored in the distribution
system?
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Answer b or c
b Determine the distribution of flow in the pipe network ABCD in which BD is the
common pipe. The flow entering at the junction A B are 50 L/s each. The
flow emerging from junction C junction D are 75 L/s 25 L/s respectively.
The values of K for AB, BC, CD, DA and DB are and 1 respectively.
The headloss may be assumed as KQn. The flow is turbulent and pipes are
rough. Use Hardy Cross method.
5
c How Equivalent Pipe method can be used for the analysis of distribution
system? Explain with one example.
5
Q.no. Module 2 Marks
2a What points to be kept in mind while designing sewers and how are the
sewers designed?
4
Answer b or c
b A rectangular sewer with width 1.5times its depth is hydraulically equivalent to
a circular one. Find the relation between the width of the rectangular sewer
and diameter of the circular sewer.
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c A sewer line carrying an average discharge of 200 L/s has to cross a stream.
Design the three-barrel syphon for this purpose, if the length of the siphon,
measured along the centre line, including the slopes is 90cm. The invert level
at the inlet and outlet ends of the sewer are 152.50m and 151.78m
respectively. The maximum and minimum flows are 250% and 40% of the
average respectively. Assume that minor losses as 0.07m and self-cleansing
velocity of 1m/s.
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Q.no. Module 3 Marks
3a What are the components of a pumping station. Explain with sketch. 4
Answer b or c
b Find the BHP of a pump which lifts water from a well to the treatment plant.
Following is the data available.
Quantity of water to lifted daily 4000m3, Length of suction pipe 30m,
Length of rising main 170m, Coeff. of friction 0.01, Pipe diameter 60cm,
Static head through which water is to be pumped 25m,
Efficiency of pump Efficiency of motor
Pumps work for 2 shifts daily, each shift being of 8hours duration.
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c Design an unlined trapezoidal section for the outfall reach of a storm water
drain collecting storm water from a catchment area of 50hectares.
Inlet time 12 minutes, Time of flow in the upper reaches of drain 18minutes,
Rainfall intensity 40mm/hr, Imperviousness factor 0.55,
Water surface slope 1 in 2000, Max. Permissible velocity 0.85m/s, n=0.025.
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Q.no. Module 4 Marks
4a Enumerate and discuss briefly the various methods which are adopted
collectively for treating public water supplies drawn from a perennial river.
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Answer b or c
b Find the settling velocity of a discrete particle in water under conditions when
Reynold's number is less than 0.05. The diameter and specific gravity of the
particle is 5 x 10-3cm and 2.65 respectively. Water temperature is 200C
(kinematic viscosity of water at 200C 1.010 x 10-2 cm2/sec)
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c Calculate the amount of bleaching powder required to treat 3.0 million litres of
water per day. The chlorine required 0.5 ppm to maintain a residual chlorine
of 0.15 ppm. If high strength Calcium hypochlorite is used in place of
bleaching powder, calculate the difference in amount required. Make your
own assumptions.
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Q.no. Module 5 Marks
5a What are various types of screens? How the head loss in screens can be
computed?
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Answer b or c
b Design a grit chamber cum detritus tank for a sewage treatment plant with 7
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average flow 600 l/s. The flow velocity through the tank is 0.2m/s and
detention period is 3minutes. The maximum flow is 3 times the average flow.
c For a conventional activated sludge treatment plant, wastewater flow
30000m3/d, volume of aeration tank 9900m3, Influent BOD 200mg/l, Effluent
BOD 20mg/l, Mixed liquor volatile suspended solid 2800mg/l, Effluent
suspended solids 35mg/l, Waste sludge suspended solids 9000mg/l and
Quantity of waste sludge 220m3/d. Compute aeration period, F/M ratio and
sludge age.
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Q.no. Module 6 Marks
6a How the design of stabilization pond can be done? 5
Answer b or c
b Design a septic tank with soil absorption system for 200 users. 7
c The design flow of sewage is 4 million litres per day and BOD of raw sewage
is 250mg/l. Design a biofilter to produce an effluent having a BOD of 40mg/l.
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