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EFFECTS OF INITIAL ABSTRACTION AND URBANIZATION ON ESTIMATED RUNOFF USING CN TECHNOLOGY 1
Author(s) -
Lim Kyoung Jae,
Engel Bernard A.,
Muthukrishnan Suresh,
Harbor Jon
Publication year - 2006
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.2006.tb04481.x
Subject(s) - surface runoff , urbanization , environmental science , watershed , hydrology (agriculture) , runoff curve number , runoff model , geology , computer science , ecology , geotechnical engineering , machine learning , biology
Few studies have been conducted to explore the effects of initial abstraction on estimated direct runoff despite the widespread use of the curve number (CN) method in many hydrologic models to estimate direct runoff. In this study, use of a 5 percent ratio of initial abstraction (I a ) to storage (S) to estimate daily direct runoff with modified CN values for a 5 percent I a /S value was investigated using the Long‐Term Hydrologic Impact Assessment (L‐THIA) geographic information system (GIS). In addition, the effects on estimated runoff of altering the hydrologic soil group due to urbanization were investigated. The L‐THIA model was applied to the Indiana Little Eagle Creek watershed with 5 percent and 20 percent I a /S values, considering hydrologic soil group alteration due to urbanization. The results indicate that uses of a 5 percent l a /S and modified CN values and Hydrologic Soil Group D for urbanized areas in model runs can improve long term direct runoff prediction.