Research Article
Dec 1974
Hydrology of 7-Day 10-Yr Low Flows
Publication: Journal of the Hydraulics Division
Volume 100, Issue 12
Abstract
The level of treatment necessary for maintaining stream quality depends on the dilution ratio, defined as the ratio of the 7-day 10-yr low flow in the stream to the average dry weather flow from the treatment plant. The natural low flows depend on physiography, baseflow regime, stream entrenchment, flood-plain development, magnitude of the drainage area of the stream, etc. The natural low flows are modified by recreational pools created by in-river impoundments, reservoirs or lakes for recreation and regulation of flows, urbanization, municipal and industrial water use and wastewater treatment plant effluents, and navigation pools. Downstream of the confluence of two major streams draining hydrologically dissimilar areas, the low flow exceeds the sum of the two individual low flows, because they are out of phase with each other. Examples are presented showing the effect of these factors on the 7-day 10-yr low flow in streams.
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Published In
Journal of the Hydraulics Division
Volume 100 • Issue 12 • December 1974
Pages: 1753 - 1771
Copyright
© 1974 American Society of Civil Engineers.
History
Published in print: Dec 1974
Published online: Feb 3, 2021
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Authors
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Krishan P. Singh, M.ASCE
Hydrologist, State Water Survey, Urbana, Ill
John B. Stall, F.ASCE
Head, Hydrology Section, State Water Survey, Urbana, Ill
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.