Sampling Adjustment Factors for Rainfall Recorded at Fixed Time Intervals
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VIEW THE REPLYPublication: Journal of Hydrologic Engineering
Volume 8, Issue 5
Abstract
Precipitation data collected at fixed time intervals will most likely miss true maximum accumulations for durations equal or close to the sampling interval. This becomes a problem when fixed-interval rainfall data are used for frequency analysis. Sampling adjustment factors (SAF) are often used to correct for this mismatch between true and observed maxima. An SAF is the average ratio of the true maximum accumulation to the maximum given by a fixed-interval gauge record. This paper uses high temporal-resolution data from ALERT-type rain gauges in the Kansas City area to derive an empirical relationship for SAF versus the sampling ratio, which is the ratio of the duration of interest to the sampling interval. This relationship is consistent across durations ranging from 1 to 24 h, and is in good agreement with other studies.
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References
Frederick, R. H., Myers, V. A., and Auciello, E. P. (1977). “Five to 60-minute precipitation frequency for the eastern and central United States.” NOAA Technical Memorandum NWS HYDRO-35, National Weather Service, U. S. Dept. of Commerce, Washington, D.C.
Hershfield, D. M. (1961). “Rainfall frequency atlas of the United States for durations from 30 minutes to 24 hours and return periods from 1 to 100 years.” Technical Paper No. 40, Weather Bureau, U.S. Dept. of Commerce, Washington, D.C.
Huff, F. A. and Angel, J. R. (1992). “Rainfall frequency atlas of the midwest.” Illinois State Water Survey Bulletin 71, Research Rep. 92-03, Midwestern Climate Center, 1–141.
Weiss, L. L.(1964). “Ratio of true to fixed interval maximum rainfall.” J. Hydraul. Div., Am. Soc. Civ. Eng., 90(1), 77–82.
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Published In
Journal of Hydrologic Engineering
Volume 8 • Issue 5 • September 2003
Pages: 294 - 296
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jul 24, 2002
Accepted: Nov 10, 2002
Published online: Aug 15, 2003
Published in print: Sep 2003
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