Research Article
Jan 1966
Time in Urban Hydrology
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VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 92, Issue 1
Abstract
An analysis of lag time (defined as time between centroids of effective precipitation and runoff) from nine small urban watersheds shows that lag time variability is small and that lag time is not correlated with storm intensity. Effective precipitation can be routed through storage by the Muskingum method to accurately reproduce an observed runoff hydrograph. Effective precipitation is separated from total precipitation by the phi-index. Precipitation loss on a watershed is closely represented by a linear relationship between total storm precipitation and total storm runoff. On impervious watersheds, precipitation loss seems to be related to watershed slope. Instrumentation requirements for adequate data collection on urban watersheds include synchronization of precipitation and runoff records, use of at least two rain-gages, and accurate runoff measurement at high and low flows. Watershed selection is important for successful data collection.
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Published In
Journal of the Hydraulics Division
Volume 92 • Issue 1 • January 1966
Pages: 13 - 29
Copyright
© 1966 American Society of Civil Engineers.
History
Published in print: Jan 1966
Published online: Feb 3, 2021
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Authors
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Gene E. Willeke, AM.ASCE
Graduate Student, Stanford Univ., Stanford, Calif.; formerly Hydr. Engr., Great Lakes-Illinois River Basins Project, Public Health Service, Div. of Water Supply and Pollution Control, Region V, U. S. Dept. of Health, Education and Welfare, Chicago, Ill.
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