UNIVERSITY OF BOLTON WESTERN INTERNATIONAL COLLEGE FZE BENG (HONS) CIVIL ENGINEERING SEMESTER ONE EXAMINATION 2015/2016
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1 OCD63 UNIVERSITY OF BOLTON WESTERN INTERNATIONAL COLLEGE FZE BENG (HONS) CIVIL ENGINEERING SEMESTER ONE EXAMINATION 015/016 WATER ENGINEERING AND THE ENVIRONMENT MODULE NO: CIE601 Date: 15 January 016 Time: am 1.00pm INSTRUCTIONS TO CANDIDATES: There are SIX questions on this paper. Answer any FIVE questions. All questions carry equal marks. Marks for parts of questions are shown in brackets. This examination paper carries a total of 100 marks. Supplementary Information is provided on pages 7-1. All working must be shown. A numerical solution to a question obtained by programming an electronic calculator will not be accepted.
2 Western International College FZE BEng (Hons) Civil Engineering Semester One Examination 015/016 Water Engineering and the Environment Module No. CIE601 Page of 1 1. a) b) Sketch a flow chart identifying the sequence of processes used in sewage treatment works (6 marks) List the factors influencing the impact of the effluent on the quality of the receiving water as per EA directives. State the basis of effluent quality classifications set by Environmental Agency (EA) when permission to discharge to a water course is given (8 marks) c) Briefly explain the purpose and operation of the following water treatment process units i) First stage rapid sand filter ii) Dissolved Air Flotation (3 marks) (3 marks) Total 0 marks
3 . a) Water is pumped from a treatment works to a service reservoir through a 350mm diameter pipe which is 1000m in length and has a roughness value k s of 1.5mm. Two pumps connected in parallel are installed in the pumping station at the works. Each pump has the characteristics given below. Q (litres/s) H (m) P (kw) E (%) If the static head is 1 m for one pump and 10m for two pumps, using the graph paper provided, determine i.) The maximum possible flow to the works ii.) The minimum possible flow to the works Table Q. and HRS Tables are provided on Pages 8 & 9-11 respectively. (1 marks) b) A centrifugal pump with an impeller size of 90mm has been tested and the following results obtained at an efficiency of 60%. Speed (N) 100 r.p.m. Flow (Q) 6 litres/sec Head (H) 3m Determine the discharge and operating head for a geometrically similar pump with an impeller size of 10mm operating at a speed of 1800 revs/min at the same efficiency. (8 marks) Total 0marks 3. a)
4 b) Give a situation where both Alternate Depth and Conjugate Depth in open channel flow may occur. Explain with suitable diagrams (8 marks) Water flows at a rate of 10m 3 /sec in a.5m wide rectangular channel at a depth of 1.m. A bed hump is located in the channel which causes the water surface to drop by 0.1m. Determine the height of the hump. What height of hump would cause critical depth flow over the hump? (1 marks) 4. a) Total 0 marks Describe the procedure for the prediction of open channel flow profiles. Explain the water surface profile for an S flow with the help of sketch. (8 marks) b) A stilling basin, utilising a hydraulic jump to dissipate energy, is to be designed for the dam spillway. The maximum flood flow over the spillway is to be 50m 3 /sec. The spillway is 11m wide and slopes at 45 and has a Manning 'n' value of 0.0. Determine a suitable weir height, above the stilling basin apron, to ensure the formation of a hydraulic jump. (1 marks) Total 0marks 5. a) A land drainage channel of trapezoidal cross section with side slopes H: 1V, is to be excavated at a gradient of 1 in 355 in ground which is largely
5 composed of cobbles and shingles for which D 50 is 75 mm. If the peak flow is to be 0m 3 /sec, determine suitable channel dimensions using the maximum permissible velocity method. Table Q5 is provided on Page 1. (10 marks) b) With the aid of diagrams, briefly explain what is meant by the term unit hydrograph and discuss its use in flood prediction. (6 marks) c) Discuss the types of sediment related problems faced by civil engineers. (4 marks) Total 0marks 6. a) Outline the objectives that an effective Combined Sewer Overflow should satisfy. What are the factors influencing the determination of CSO chamber specifications. (8 marks) b)
6 A stilling pond CSO chamber of breadth 3.8m is designed for a combined sewerage system. It serves a population of 8000 and receives a peak storm flow of.5 m 3 /s(hydroworks). A 50mm diameter orifice is used to control the flow passing to the downstream sewer which is 450mm in diameter, has a k s value of 1.5mm and is laid at a gradient of 1 in 15. The overflow weir crest height above the centre of the orifice is.0m. Using the information given below, check the adequacy of the control and determine the peak flow passing to the downstream sewer. HRS tables are provided. G = 50 l/h/d I = 40 l/h/d E =,00,000 l/d (1 marks) Total 0marks END OF QUESTIONS for Supplementary Information Supplementary Information Formulae Sheet h f = S 0 x L K H gh N D Q ; KQ 3 ND ; Q = A v 1 v. R n 3. S 1 0
7 v q E y y g gy y Q ga q g y 3 c ; y1 y [ 1 8Fr1 1] DWF=P.G+P.I+E Q q ; E c = 1.5y c ; vc gyc ; B Formula A: Q= DWF+1360.P+E F r v gy D 0.815Q 0.4 Q 0 Cd A0.. g.. H 0
8 Page 8 of 1 Western International College FZE BEng (Hons) Civil Engineering Semester One Examination 015/016 Water Engineering and the Environment Module No. CIE601 Table Q. Flow (l/s) H for one pump alone (m) H for two pumps in parallel (m) h f for one pump (m) h f for two pumps in parallel(m) H T for one Pump (m) H T for two Pumps in parallel(m) TO BE HANDED IN WITH ANSWER BOOK Candidates ID No...
9 Page 9 of 1 RAK Academic centre BEng(HONS) Civil Engineering Semester One Examination 015/016 Water Engineering and the Environment Module No. CIE601
10
11 Table Q5.
12 END OF PAPER
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