Surging in Urban Storm Drainage Systems
Publication: Journal of Hydraulic Engineering
Volume 116, Issue 12
Abstract
The existence of surge and related problems, namely, sharp‐peaked overflows, manhole, or drop‐shaft cover blow‐off; waterjets into the atmosphere (geysers); and structural damages in urban storm drainage systems, are described conceptually and illustrated with both a mathematical model and field records. A storm sewer tunnel in the system may be pressurized if its conveyance capacity is exceeded or if it is also used for storage. The pressurization process is associated with the movement of a surge that separates the free‐surface flow regime from the pressurized flow regime. Analysis of the surge movement characteristics revealed that the surge strength at the end of the pressurization process determines the extent of the surge problems. Operational and structural methods to reduce the surge strength are proposed and evaluated for the Mainstream System and the O'Hare System of the Tunnel and Reservoir Plan in Chicago, Illinois. They include inflow regulation, initial storage regulation, use of a downstream reservoir, and use of an upstream surge tank.
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Information
Published In
Journal of Hydraulic Engineering
Volume 116 • Issue 12 • December 1990
Pages: 1523 - 1537
Copyright
Copyright © 1990 ASCE.
History
Published online: Dec 1, 1990
Published in print: Dec 1990
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