Normalized Antecedent Precipitation Index
Publication: Journal of Hydrologic Engineering
Volume 6, Issue 5
Abstract
Antecedent precipitation too often remains a subjectively determined and arbitrarily implemented parameter in rainfall-runoff modeling. Antecedent moisture can account for a several-fold difference in runoff from the same storm in an otherwise identical watershed. The antecedent precipitation index and the Natural Resource Conservation Service's antecedent moisture condition triad are conventional expressions of antecedent precipitation. Unfortunately, neither index consistently characterizes the runoff consequence of watershed moisture preceding a rainfall event. A normalized antecedent precipitation index is proposed that modifies the conventional index in three aspects: inclusion of antecedent precipitation earlier in the day of the event, normalization to the station mean, and normalization to the antecedent series length. The proposed index, based on daily rainfall record, is theoretically simple and mathematically continuous. Initial results show the proposed index to outperform single curve number-based results, even when the curve number is fit to historic rainfall-runoff records. The proposed index enhances delineation of the antecedent moisture condition for estimates based on that parameter and provides a basis for runoff estimates where the initial watershed moisture condition is probabilistic.
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References
1.
Gray, D. D., Katz, P. G., deMonsabert, S. M., and Cogo, N. P. (1982). “Antecedent moisture condition probabilities.”J. Irrig. and Drain. Engrg. Div., ASCE, 108(2), 107–114.
2.
Hawkins, R. H., Hjelmfelt, A. T., and Zevenberger, A. W. (1985). “Runoff probability, storm depth, and curve numbers.”J. Irrig. and Drain. Engrg., ASCE, 111(4), 330–340.
3.
Kohler, M. A., and Linsley, R. K., Jr. ( 1951). “Predicting runoff from storm rainfall.” Res. Paper 34, U.S. Weather Bureau, Washington, D.C.
4.
Liou, M. F., and Chen, H. H. ( 1993). “Study on antecedent moisture condition affected relationship between rainfall and runoff.” Q. J. Experimental Forest of Nat. Taiwan Univ., 7(3), 73–97.
5.
National Climatic Data Center (NCDC). ( 1998). Climate research data, Daily Historical Climatology Network, Asheville, N.C.
6.
Natural Resources Conservation Service (NRCS). ( 1993). “Section 4: Hydrology.” National engineering handbook, U.S. Department of Agriculture, Washington, D.C.
7.
Ponce, V. M., and Hawkins, R. H. (1996). “Runoff curve number: Has it reached maturity?”J. Hydrologic Engrg., ASCE, 1(1), 11–19.
8.
Rallison, R. E. ( 1980). “Origin and evolution of the SCS runoff equation.” Proc., Irrig. and Drain. Symp. on Watershed Mgmt., Vol. 2, ASCE, New York, 912–924.
9.
Singh, V. P. ( 1989). Hydrologic systems watershed modeling, Vol. 2, Prentice-Hall, Englewood Cliffs, N.J.
10.
Thurman, J. E., and Roberts, R. T. ( 1989). “Hydrologic data for experimental agricultural watersheds in the United States.” Miscellaneous Publ. 1469, Agric. Res. Service, U.S. Department of Agriculture, Washington, D.C.
11.
Viessman, W., Jr. and Lewis, G. L. ( 1996). Introduction to hydrology. 4th Ed., HarperCollins, New York.
12.
Witherspoon, D. F. ( 1961). Runoff from rainfall on small agricultural watersheds. Dept. of Engrg. Sci., Ontario Agricultural College, Guelph, Ontario, Canada.
13.
Xia, J., O'Connor, K. M., Kachroo, R. K., and Liang, G. C. ( 1997). “A non-linear perturbation model considering catchment wetness and its application in river flow forecasting.” J. Hydro., Delft, The Netherlands, 200(1–4), 164–178.
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Information
Published In
Journal of Hydrologic Engineering
Volume 6 • Issue 5 • October 2001
Pages: 377 - 381
History
Published online: Oct 1, 2001
Published in print: Oct 2001
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