Performance modeling of storm water best management practices with uncertainty analysis

Daeryong Park, Jim C. Loftis, Larry A. Roesner

Research output: Contribution to journalArticlepeer-review

Abstract

The performance of storm water best management practices (BMPs) contains many uncertainties that make predicting BMP performance difficult. The objective of this study is to build a BMP performance model that incorporates uncertainty analysis and to evaluate this model using observed total suspended solids (TSS) from detention basin data sets in the International Stormwater BMP Database. The representative storage-treatment performance model, the k-C*model, was chosen to represent BMP performance. Its input parameters, influent event mean concentration (EMC) (Cin), and the areal removal rate constant (k) are considered with the uncertainty analysis. To estimate the variance associated with k, the prediction interval method is applied to the linear regression equation relating hydraulic loading rate (q) to k. To estimate the variance of Cin, observed Cin data in the BMP database are used. This study assumes that both Cin and k can be represented by lognormal distributions. The probability density function of effluent EMC (Cout) is estimated and compared with observed effluent data Cout for three cases: uncertainty in Cin, uncertainty in k, and uncertainty in both Cin and k. This study applies three different uncertainty methods: the derived-distribution method (DDM), Latin hypercube sampling (LHS), and the first-order second-moment (FOSM) method. Results show that LHS is the most efficient method among the three to characterize the uncertainty of Cout in univariate or bivariate cases in the k-C* model. Moreover, the uncertainty of Cout, considering uncertainty in both Cin and k, contains all observed data within a 95% confidence interval.

Original languageEnglish (US)
Pages (from-to)332-344
Number of pages13
JournalJournal of Hydrologic Engineering
Volume16
Issue number4
DOIs
StatePublished - Apr 8 2011

Keywords

  • ISWS
  • Latin hypercube sampling
  • Derived distribution method
  • Best management practice
  • First-order second-moment
  • International Stormwater BMP Database
  • Storm water
  • Uncertainty analysis
  • k-C* model

ASJC Scopus subject areas

  • Water Science and Technology
  • Environmental Science(all)
  • Environmental Chemistry
  • Civil and Structural Engineering

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