Returning Impaired Marine Outfall Diffusers to Full Service
Publication: Journal of Environmental Engineering
Volume 123, Issue 3
Abstract
This paper considers the troubled diffusers of four major U.S. outfalls, one in Hawaii and three on the West Coast. All four of these facilities had damaged and/or blocked outflow devices, and contained deposits that were responsible for flow obstruction. The difficult and expensive rehabilitation measures are described on a case by case basis. In one instance, a pipe in deep water was simply flushed following port-clearing operations. In other instances, nonhazardous materials were vacuumed into shallow local waters, and risers were returned to full service. In the fourth case, the hazardous deposits were carefully pumped from deep water to a barge and treated; the liquid and solid fractions were disposed of separately. This paper concludes with a pair of sections: a summary of the important lessons learned from the case studies, and a list of vital considerations for the whole outfall inspection-operation-maintenance-repair process. Full realization of the potential pitfalls should help engineers and coastal wastewater agencies prevent their recurrence.
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References
1.
Belcher, T. R.(1991). “Distant eyes.”Civ. Engrg., ASCE, 61(5), 53–55.
2.
Brown, M. J. (1988). “Design, construction and operation of sea outfalls in southeast England.”Proc., Int. Conf. on Marine Disposal of Wastewater, Wellington, New Zealand.
3.
Capone, V. J.(1988). “Searching through the sewer outfall of San Francisco Bay.”Sea Technol., 29(8), 43–46.
4.
Chin, A. G., and Dirks, M. C.(1967). “Placing pipelines and outfalls under water for Seattle metro trunk sewers.”Civ. Engrg., 37(12), 54–56.
5.
Clark, M. W. (1994). “Reconstruction of British Nuclear Fuel's Drigg marine outfall.”J. Instn. of Water and Envir. Mgmt., 8(Apr.), 109–119.
6.
Dadson, J. (1982). “Marine growth chokes sea outfalls and confounds design assumptions.”New Civ. Engr., 474(Jan.), 26–27.
7.
“Deep-sea divers position metro outfall.” (1965). Pacific Builder and Engr., 71(6), 71–73.
8.
Dorling, P. (1994). “Mining water in western Cornwall.”Tunnels & Tunnelling, (June), 27–30.
9.
French, J. A.(1995). “Pigging submarine outfalls.”J. Envir. Engrg., ASCE, 121(5), 396–401.
10.
French, J. A.(1994). “Offshore rescue.”Civ. Engrg., ASCE, 64(10), 42–45.
11.
Grace, R. A. (1978). Marine outfall systems: planning, design, and construction. Prentice-Hall, Inc., Englewood Cliffs, N.J.
12.
Grace, R. A.(1985). “Sea outfalls—a review of failure, damage, and impairment mechanisms.”Proc., Instn. of Civ. Engrs, London, England, Part 1, 77(1), 137–152.
13.
Hellemn, J. E., et al. (1994). “Underwater environmental survey operations using laser line scan technology.” Technical Papers, Underwater Intervention 94, Feb.
14.
Lilly, K. Jr., et al. (1993). “Case studies of ocean outfall inspection—San Francisco and Seattle.”Proc. Coast. Zone '93, ASCE, New York, N.Y., 2297–2311.
15.
“Ocean briefs: Scotland.” (1996). Ocean News & Technol., (May/June), 9.
16.
“Polyethylene pipe relines 32-in. outfall on California coastline.” (1974). Civ. Engrg., ASCE, 44(1), 18–20.
17.
Roberts, D. G. M., et al. (1984). “Weymouth and Portland marine treatment scheme: tunnel outfall and marine treatment works.”Proc., Instn. of Civ. Engrs., Part 1, 76(Feb.), 117–143.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 123 • Issue 3 • March 1997
Pages: 297 - 303
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Mar 1, 1997
Published in print: Mar 1997
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