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The enactment of stringent water-quality standards
(P.L. 92-500) to protect the water resources of the country has necessitated the
development of improved means of stormwater disposal in metropolitan cities. Collecting
systems that consist of underground storage tunnels connected to the near-surface
storm-drainage system by long vertical shafts have been adopted in several sanitary
districts. Drop structures with long vertical shafts are one of the key elements of the
in-line storage systems. Extensive research work has been done by Professor Subhash C. Jain at the IIHR to improve designs of drop structures. IIHR has designed drop structures for several storm-drainage systems, e.g., Milwaukee Metropolitan Sewerage District, Northeast Ohio Regional Sewer District, Arizona Department of Transportation, Sewerage Bureau of Tokyo Metropolitan Government, and Greater Houston Wastewater Program. The use of drop structures for diversion of floodwaters among rivers in Tokyo, Japan was investigated in a study sponsored by Japan Institute of Construction Engineering. IIHR recently (1998) was awarded a contract from the Massachusetts Water Resources Authority to develop designs of drop structures for City of Boston. |
Model of a baffle-type drop structure made by the IIHR Mechanical Shop More InformationFor more information about IIHR vertical drop structures contact |
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to: webmaster@iihr.uiowa.edu Contact us at: iihr@uiowa.edu or call 319-335-5237 Copyright © The University of Iowa 2005. All rights reserved. Iowa City, IA 52242 This page was last updated on December 30, 2009 |
