Regional Frequency Analysis of Extreme Precipitation in Northeastern Colorado and Fort Collins Flood of 1997
Publication: Journal of Hydrologic Engineering
Volume 7, Issue 1
Abstract
Regional frequency analysis based on the index flood method has been utilized to analyze short duration annual maximum precipitation (AMP) for Northeastern Colorado. An extraordinary storm and flood that occurred in the City of Fort Collins, Colorado, in July 1997 prompted the study. The main objective of the study was to develop regional frequency curves that may be useful for that part of Colorado. In addition, we wanted to answer the question whether the City’s design criteria for storm drainage as of 1997 was adequate, and to determine to what degree the referred storm was indeed an extraordinary storm. We utilized up-to-date technology that has been widely popularized in literature, with some minor modifications. We conclude that the regional growth curves developed may be useful for the subregions specified. However, they should be used with caution for sites located near the boundaries of subregions close to the Colorado Front Range. This has become evident in determining the precipitation quantiles for Fort Collins, for which it was necessary to further narrow down the subregions. The study also showed that the city’s storm drainage design criteria were underestimated. Furthermore, the 1997 2 and 3 h storms appear to be 100 yr+ events, while the return period of the 6 h storm may have been of the order of 400 years. While the study provided us with some practical answers, it nevertheless also brought a number of questions concerning the assumptions underlying the index flood approach and several steps regarding the definition of regions and testing criteria thereof. These are discussed at length in the final section of the paper.
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References
Caroni, C., and Prescott, P.(1992). “Sequential application of Wilks’s multivariate outlier test.” Appl. Stat., 41(2), 355–364.
Cunnane, C.(1988). “Methods and merits of regional flood frequency analysis.” J. Hydrol., 100(1–3), 269–290.
Dalrymple, T. (1960). “Flood frequency analysis.” Water Supply Paper 1543-A, U.S. Geological Survey, Washington, D.C.
Doesken, N., and McKee, T. B. (1998). “An analysis of rainfall for the July 28, 1997, flood in Fort Collins, Colorado.” Climatology Rep. 98-1, Colorado Climate Ctr., Dept. of Atmospheric Science, Colorado State University, Fort Collins, Colo.
Fill, H. D., and Stedinger, J. R.(1995). “Homogeneity tests based upon Gumbel distribution and a critical appraisal of Dalrymple’s test.” J. Hydrol., 166(1–2), 81–105.
Greenwood, J. A., Landwehr, J. M., Matalas, N. C., and Wallis, J. R.(1979). “Probability weighted moments: definition and relation to parameters of several distributions expressable in inverse form.” Water Resour. Res., 15(5), 1049–1054.
Grigg, N. S., et al. (1999). “Fort Collins flood 1997: comprehensive view of an extreme event.” J. Water Resour. Plan. Manage., 125(5), 255–262.
Hosking, J. R. M. (1986). “The theory of probability weighted moments.” Research Rep. RC12210, IBM Research Division, Yorktown Heights, N. Y.
Hosking, J. R. M.(1990). “L-moments: analysis and estimation of distributions using linear combinations of order statistics.” J. R. Stat. Soc., Ser. B, 52(1), 105–124.
Hosking, J. R. M., and Wallis, J. R.(1988). “Effect of intersite dependence on regional flood frequency analysis.” Water Resour. Res., 24(4), 588–600.
Hosking, J. R. M., and Wallis, J. R.(1993). “Some statistics useful in regional frequency analysis.” Water Resour. Res., 29(2), 271–281.
Hosking, J. R. M., and Wallis, J. R.(1995). “Correction to ‘Some statistics useful in regional frequency analysis.’ ” Water Resour. Res., 31(1), 251.
Hosking, J. R. M., and Wallis, J. R. (1997). Regional frequency analysis: an approach based on L-moments, 1st Ed., Cambridge University Press, Cambridge, U.K.
Jenkins, G. M., and Watts, D. G. (1968). Spectral analysis and its applications, 1st Ed.
Lettenmaier, D. P., Wallis, J. R., and Wood, E. F.(1987). “Effect of regional heterogeneity on flood frequency estimation.” Water Resour. Res., 23(2), 313–323.
Lu, L.-H., and Stedinger, J. R.(1992). “Sampling variance of normalized GEV/PWM quantile estimators and a regional homogeneity test.” J. Hydrol., 138(1–2), 223–245.
Miller, J. F., Frederick, R. H., and Tracey, R. J. (1973). NOAA Atlas 2, precipitation-frequency atlas of the western United States. Vol. III: Colorado, National Oceanic and Atmospheric Administration, Silver Spring, Md.
Naghavi, B., and Yu, F. X.(1995). “Regional frequency analysis of extreme precipitation in Louisiana.” J. Hydraul. Eng., 121(11), 819–827.
Ogden, F. L., Sharif, H. O., Senarath, S. U. S., Smith, J. A., Baeck, M. L., and Richardson, J. R.(2000). “Hydrologic analysis of the Fort Collins, Colorado, flash flood of 1997.” J. Hydrol., 228(1–2)), 82–100.
Rao, A. R., and Hamed, K. H.(1997). “Regional frequency analysis of Wabash River flood data by L-moments.” J. Hydrologic Eng., 2(4), 169–179.
Schaefer, M. G.(1990). “Regional analyses of precipitation annual maxima in Washington state.” Water Resour. Res., 26(1), 119–131.
Vogel, R. M., and Wilson, I.(1996). “Probability distribution of annual maximum, mean, and minimum streamflows in the United States.” J. Hydrologic Eng., 1(2), 69–76.
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Copyright © 2002 American Society of Civil Engineers.
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Received: May 30, 2000
Accepted: Jan 12, 2001
Published online: Jan 1, 2002
Published in print: Jan 2002
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