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Storm Flow from First-Flush Precipitation in Stormwater Design.
- Source :
- Journal of Irrigation & Drainage Engineering; Jul/Aug2004, Vol. 130 Issue 4, p269-276, 8p, 4 Charts, 2 Graphs, 1 Map
- Publication Year :
- 2004
-
Abstract
- Regulations for mitigating nonpoint source pollution from urban areas often include a requirement for treatment of a first-flush depth of stormwater. When the stormwater treatment technology requires specification of a design flow rate, the first-flush depth must be related to a first-flush flow rate. This paper describes a methodology to determine the relation between accumulated storm depth and corresponding flow to a treatment device for small, urban watersheds. The approach uses the rational method under the assumption that the time-of-concentration is small. Intensity–frequency relations, expressed in the form of return periods and associated intensities, were determined using a partial duration frequency analysis of regionalized precipitation data. The results of the method can be used to determine the flow rate to a treatment device that will meet a specified return period for a first-flush depth. The method is demonstrated using 13 years of 15-min data from seven Massachusetts precipitation stations. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07339437
- Volume :
- 130
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Journal of Irrigation & Drainage Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 13833968
- Full Text :
- https://doi.org/10.1061/(ASCE)0733-9437(2004)130:4(269)