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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Repeat Examinations 2009/
Module Title: Water Engineering
Module Code: CIVL
School: Building & Civil Engineering
Programme Title: BEng (Hons) in Structural Engineering
Programme Code: CSTRU_8_YR
External Examiner(s): Mr. John O’Mahony, Dr. Mark Richardson Internal Examiner(s): Dr. Joseph Harrington
Instructions: Answer Question 1 and Two Other Questions
Duration: 2 Hours
Sitting: Autumn 2010
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Answer Question 1 (compulsory)
Q1. (a) Discuss water treatment (with the aid of diagrams and give one example of a local application in each case) under the following headings: (i) ‘Traditional’ sedimentation tanks (ii) High rate clarifiers (iii) Dissolved Air Flotation. (16 marks)
(b) A water supply scheme is required for an area which includes a 3 teacher, 80 pupil national school, an estimated eventual maximum number of houses of 25 and a single large dairy farm with 100 dairy cows and up to 25 calves. Take dairy cow water demand as 150 l/head/day, calf water demand as 22 l/head/day and 50 l/day per pupil and staff.
The water supply takes water from a nearby river, which can supply the community all year round. The lowest estimated water level in the river is +3m O.D., the highest is +7.5m O.D.
A pump is required for supply and must provide the required flow at a minimum pressure head of 10m. Determine the pump requirements given information on two points within the area to be supplied: Point A (an intermediate point within the supply scheme) Distance from Supply Point: 1500m, Discharge Elevation: +17m O.D. Point B (the furthest point within the supply scheme) Distance from Supply Point: 1750m, Discharge Elevation: +16m O.D.
Use the attached flow nomogram for a polyethylene pipe. (18 marks)
Q4. (a) Discuss water demand under the following headings: (i) Domestic Use (ii) Industrial Use (iii) Distribution Losses (iv) Demand constraint measures (18 marks)
(b) Determine the minimum capacity of a storage reservoir required to maintain a constant water supply for a population equivalent of 300,000 given the following monthly mean inflow values (in m^3 /month):
Month 1 2 3 4 5 6 7 8 9 10 11 12
Inflow (x10^6 ) 7.5 8.3 3.4 2.1 0.7 0.1 0.8 1.4 2.1 2.8 5.6 8.
Check your answer using an alternative approach. (16 marks)
Open Channel Flow
Chezy Eqn.: v C m S 0
Manning Eqn.: 01 /^2
2 / 3 S n
m v
Backwater Curves
gd
v
s i dl
dd 2 1
Flood Routing
Ot (^) t C 0 It t C 1 It C 2 Ot
K KX t
KX t C
- 5
0
K KX t
KX t C
- 5
1
K KX t
K KX t C
- 5
2
C 0 C 1 C 2 1
