Effects of Mechanical Cleaning Operations on Flow in Large Conduits

by George F. Horowitz, (F.ASCE), Head; Hydr. Design Sec., The Metropolitan Water Dist. of Southern California, Los Angeles, CA,
Nelson N. Lee, (A.M.ASCE), Engr.; Hydr. Design, The Metropolitan Water Dist. of Southern California, Los Angeles, CA,

Serial Information: Journal of the Hydraulics Division, 1971, Vol. 97, Issue 5, Pg. 677-689

Document Type: Journal Paper

Discussion: Koloseus Herman J. (See full record)


By following a systematic cleaning and maintenance program in recent years, the Colorado River Aqueduct has been kept in condition to deliver substantially greater flows of water to the coastal plain of Southern California than it was originally designed to carry. The condition of the conduit surfaces is briefly described, as well as the annual cleaning operations designed to remove flow-impeding aquatic deposits from the walls of the conveyance system. An analysis of the variations in Manning's roughness coefficient n is presented for various components of the system. A comparison of such n values before and after mechanical cleaning of the aqueduct is given in summary form.

Subject Headings: Conduits | Aqueducts | Ecological restoration | Rivers and streams | Coastal management | Water flow | Maintenance | Coastal plains | River flow | North America | California | Colorado River | United States

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