Page 288 - Water Engineering Hydraulics, Distribution and Treatment

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Pumping, Storage, and Dual Water Systems
Chapter 8
(g) Design water velocity through the gate = 0.5 ft/s (maximum;
Health Research Inc, Recommended Standards for Water Works,
2007 Edition, Albany, NY, 2007.
the Ten-States Standards).
(h) One of the two square gates can be closed for screen repair or
Hydraulic Institute, Standards for Rotodynamic (Centrifugal) Pump
Applications, ANSI/HI 1.3, 2007.
replacement.
Conduct a hydraulic stability analysis for the raw water RC
Institution of Mechanical Engineers, Centrifugal Pumps: The State
8.25
of the Art and New Opportunities: IMechE Seminar, John
intake structure tentatively designed in Problem 8.24. The intake
Wiley & Sons, Inc., New York, August 2000.
structure displaces a large amount of water. The weight of the intake
structure must be greater than the weight of water displaced in order
Jones, G. M., Sanks, R. L., Tchobanoglous, G., and Bosserman,
to ensure hydraulic stability. In case the tentatively designed RC
B. E., Pumping Station Design, 3rd ed., vol. 1, Butterworth
intake structure (from Problem 8.24) is concluded to be hydrauli-
Heinemann/Elsevier Publication, Maryland Heights, MO,
cally unstable, please suggest how to make corrections. The follow-
2008, 104 pp.
ing are the assumed engineering conditions:
Miles, A. N., Singei, P. C., Ashley, M. C., Lynberg, M. C., Langlois,
(a) Outside dimensions of the raw water concrete intake structure =
R. H., and Nuckols, J. R., Comparisons of trihalomethanes in
27.89 ft × 27.89 ft; inside dimensions of the raw water concrete tap water and blood, Environmental Sciences and Technology,
intake structure = 21.33 ft × 21.33 ft; height of the raw water vol. 15, pp. 1692–1698, April 2002.
concrete intake structure = 285.43 ft – 196.85 ft = 88.58 ft;
base-reinforced concrete slab selected = 45.93 ft × 45.93 ft × Okun, D. A., Distributing reclaimed water through dual sys-
8.20 ft (thickness) tems, Journal of American Water Works Association., vol. 89,
pp. 62–74, March 1997.
(b) Elevation of the intake structure top (maximum) = 285.43 ft
(msl = mean sea level); elevation of maximum reservoir water Okun, D. A., Improving quality and conserving resources using
dual water systems, Water, vol. 21, pp. 47–50, February 2007.
level = 269.03 ft (msl); elevation of normal reservoir water
level = 265.75 ft (msl); elevation of minimum reservoir water Percival, S. L., Knapp, J. S., Edyvean, R., and Wales, D. S., Biofilm
level = 262.47 ft (msl); elevation of the intake structure bottom development on stainless steel in mains water, Water Research,
(planned) = 196.85 ft (msl) vol. 32, pp. 243–253, 1998.
3
(c) Weight of reinforced concrete = 144 lb/ft ; weight of water = Qasim, S. R., Motley, E. M., and Zhu, G., Water Works Engineering:
62.4 lb/ft 3 Planning, Design & Operation, PHI Learning Private Limited,
New Delhi, 2011, 844 pp.
(d) Required safety factor = 1.5–2.0
Rich, G. R., Hydraulic Transients, McGraw-Hill, New York, 1951.
Rouse, H., Engineering Hydraulics, John Wiley & Sons, Inc., New
York, 1950.
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