Theoretical Justification of SCS Method for Runoff Estimation

No Thumbnail Available
File version
Author(s)
Yu, Bofu
Griffith University Author(s)
Primary Supervisor
Other Supervisors
Editor(s)
Date
1998
Size
File type(s)
Location
License
Abstract

The Soil Conservation Service (SCS) method is widely used to estimate runoff from small- to medium-sized watersheds. The most critical assumption of the SCS method is that the ratio of the actual retention to the potential retention is the same as the ratio of actual runoff to potential runoff, but this assumption has not been theoretically nor empirically justified. This paper shows that the exact relationship between rainfall and runoff in the SCS method can be derived theoretically if two simple but reasonable assumptions are made: (1) The spatial variation of infiltration capacity has an exponential distribution; and (2) the temporal variation of rainfall rate also follows an exponential distribution. A theoretical basis for the SCS method allows an independent validation of the method by testing how rainfall intensity and infiltration capacity actually vary in time and space, respectively.

Journal Title

Journal of Irrigation and Drainage Engineering

Conference Title
Book Title
Edition
Volume

124-6

Issue
Thesis Type
Degree Program
School
Publisher link
Patent number
Funder(s)
Grant identifier(s)
Rights Statement
Rights Statement
Item Access Status
Note
Access the data
Related item(s)
Subject

Civil Engineering

Interdisciplinary Engineering

Persistent link to this record
Citation
Collections