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Overflow Risk Analysis for Designing a Nonpoint Sources Control Detention
Author(s) -
Choi Chi Hyun,
Cho Seonju,
Park Moo Jong,
Kim Sangdan
Publication year - 2012
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143012x13373550426959
Subject(s) - nonpoint source pollution , runoff curve number , environmental science , detention basin , surface runoff , risk assessment , pollutant , hydrology (agriculture) , stormwater , environmental engineering , computer science , engineering , ecology , chemistry , computer security , geotechnical engineering , organic chemistry , biology
This paper presents a design method by which the overflow risk related to a detention for managing nonpoint pollutant sources in urban areas can be evaluated. The overall overflow risk of a nonpoint pollutant sources control detention can be estimated by inherent overflow risk and operational overflow risk. For the purpose of calculating overflow risk, the 3‐parameter mixed exponential distribution is applied to describe the probability distribution of rainfall event depth. As a rainfall‐runoff calculation procedure required for deriving a rainfall capture curve, the U.S. Natural Resources Conservation Service runoff curve number method is applied to consider the nonlinearity of the rainfall‐runoff relation. Finally, the detention overflow risk is assessed with respect to the detention design capacity and drainage time. The proposed overflow risk assessment is expected to provide a baseline to determine quantitative parameters in designing a nonpoint sources control detention.