Record Display for the EPA National Library Catalog


Main Title Variety, Classification and Association in Rainfall-Runoff Response.
Author Hawkins, R. H. ;
CORP Author Arizona Univ., Tucson. School of Renewable Natural Resources.;Corvallis Environmental Research Lab., OR.
Publisher Dec 93
Year Published 1993
Report Number EPA-813651-01; EPA/600/R-93/232;
Stock Number PB94-130374
Additional Subjects Watersheds ; Rainfall-runoff relationships ; Land use ; Overland flow ; Surface runoff ; Rainfall intensity ; Storms ; Runoff coefficient ; Flow duration ; Precipitation(Meteorology) ; Hydrology ;
Library Call Number Additional Info Location Last
NTIS  PB94-130374 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 50p
A study of over 11,000 event rainfall and associated direct runoff events from 100 small watersheds was done, in a search for distinct patterns of runoff response and/or association with land type. Five separate response groups were identified: (1) Inactive, characterized by no recorded responses to any rainstorm in an extended period of record; (2) Complacent, characterized by a very small part of the rainfall (ca 0.1 to 3 percent) being converted to direct runoff, often as a linear response; (3) Standard behavior, the expected 'textbook' response common to agricultural lands and humid sites; (4) Violent behavior, in which an abstraction threshold of 2-6 cm clearly precedes a sudden high response; and (5) Abrupt response in which a very high portion of the rainfall is converted to event runoff without appreciable abstraction, as typified by extensively urbanized drainages. The responses and the group identifications were parameterized by a simple broken-line linear rainfall-runoff equation, and a dichotomous key based on coefficient values is proposed. Only mild associations between response type or coefficient values and the four vegetative covers (Forest, Range, Agriculture, and Urban) were found.