title: Overflow risk analysis for designing a nonpoint sources control detention.
abstract: 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.
authors.affiliation: Urban Creation Research Office, Busan Development Institute, Busan, Korea.
authors.forename: Chi Hyun
authors.initials: CH
authors.lastname: Choi
authors.forename: Seonju
authors.initials: S
authors.lastname: Cho
authors.forename: Moo Jong
authors.initials: MJ
authors.lastname: Park
authors.forename: Sangdan
authors.initials: S
authors.lastname: Kim
mesh_terms: D004323:Drainage, Sanitary; D011891:Rain; D014872:Water Movements; D014876:Water Pollution / Q000517:prevention & control*