Simple Estimation of Prevalence of Hortonian Flow in New York City Watersheds

This study was a statistical evaluation of the prevalence of infiltration excess runoff (i.e., Hortonian flow) for undeveloped areas within New York City (NYC) watersheds. Identifying the hydrological processes generating runoff is central to developing watershed management strategies for protecting...

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Bibliographic Details
Published in:Journal of hydrologic engineering 2003-07, Vol.8 (4), p.214-218
Main Authors: Walter, M. Todd, Mehta, Vishal K, Marrone, Alexis M, Boll, Jan, Gérard-Marchant, Pierre, Steenhuis, Tammo S, Walter, Michael F
Format: Article
Language:English
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Summary:This study was a statistical evaluation of the prevalence of infiltration excess runoff (i.e., Hortonian flow) for undeveloped areas within New York City (NYC) watersheds. Identifying the hydrological processes generating runoff is central to developing watershed management strategies for protecting water quality. Fifteen-minute rainfall data from East Sidney, N.Y. (1971-2002) were used as maximum observed intensities. Maximum exceedance analyses were performed on a monthly basis to investigate seasonal rainfall intensity trends. Hortonian flow was assumed to occur whenever the rainfall intensity exceeded the soil permeability. Soil permeabilities were obtained from the U.S. Natural Resource Conservation Service soil survey. Results show that Hortonian flow is unlikely to occur anywhere for events smaller than the 3-year 15-min event. Only for the summer months, May-August, is Hortonian flow expected for 15-min intensities of
ISSN:1084-0699
1943-5584
DOI:10.1061/(ASCE)1084-0699(2003)8:4(214)