A systematic over-estimation of Flows

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Title A systematic over-estimation of Flows
Author Yu, Bofu
Journal Name Journal of Hydrology
Year Published 2000
Place of publication Netherlands
Publisher Elsevier Science
Abstract For medium-sized runoff plots to small watersheds, it is a common practice to record water levels in a flume or upstream of a weir and to convert the data on water level into flow hydrographs via a rating curve. The flow hydrograph can be integrated using the trapezoidal rule to determine the runoff amount for storm events. It can be shown that such an approach to runoff calculation involves a systematic error, always resulting in an over-estimation of the runoff amount. The relative error lies in the range from 0 to (b−1)/2, where b is the exponent of the power function describing the rating curve. A case study using the data for 34 storm events with runoff amount varying from 2.7 to 186 mm showed that the average relative error was 8.6% and the maximum relative error can be as high as 23%. Formulas with essentially no additional computational cost are recommended to calculate the runoff amount exactly.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.elsevier.com/wps/find/journaldescription.cws_home/503343/description#description
Alternative URI http://dx.doi.org/10.1016/S0022-1694(00)00223-7
Volume 233
Page from 258
Page to 262
ISSN 0022-1694
Date Accessioned 2001-01-01
Date Available 2010-07-06T06:58:21Z
Language en_AU
Research Centre Atmospheric Environment Research Centre
Subject PRE2009-Science & Technology
URI http://hdl.handle.net/10072/3087
Publication Type Article in Scholarly Refereed Journal
Publication Type Code c1

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