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IDEAL model
IDEAL (Integrated Design, Evaluation, and Assessment of Loadings) is a post-construction water quality model for designing stormwater best management practices (BMP) (see Best management practice for water pollution) and calculating their effectiveness in removing common stormwater pollutants (sediments, bacteria, nitrogen and phosphorus). The model's runoff treatment algorithms are process-based by predicting runoff rates and pollutant loads and routing these loadings through BMPs using technologies which have been experimentally validated.〔Driscol, E.D., D. DiToro, D. Gaboury, and P. Shelly. "Methodology for Analysis of Detention Basins for Control of Urban Runoff Quality". Report No. EPA 440/5-87-001 (NTIS No. PB87 116562). US Environmental Protection Agency, Office of Water, Washington, DC. (1986)〕〔Foster, G.R., R.A. Young, and W.H. Neibling. "Sediment Composition for Nonpoint Source Pollution Analyses". ''Transactions of the ASAE'', 28(1):133-146. (1985)〕〔Haan, C.T., B.J. Barfield, and J.C. Hayes. Design Hydrology and Sedimentology for Small Catchments. Academic Press, San Diego, CA. (1994)〕 Using isothermic relationships along with accepted decay, settling, and infiltration methods, pollutant trapping in BMPs is computed. The developers of the IDEAL model are Bill Barfield (Regents Professor at Oklahoma State University, Woolpert Inc.) and John Hayes of Clemson University. Currently, six BMPs can be modeled with IDEAL: sand filters, wet and dry detention basin, bioswales, bioretention cells, and vegetated filter strips. The ability to model engineered devices has recently been developed, but requires trapping efficiency information to be input. Rainwater tanks or cisterns can also be modeled. Currently, hydraulic modeling of closed systems and open channels is simplistic.
A recent (2003) article on the model was presented in ''Stormwater'' magazine.〔J.C.Hayes,Billy J. Barfield et al. (A Model for Assessing the Impact of BMPs on Water Quality ), ''Stormwater'' Magazine, Forester Media, Inc. (Sept-Oct 2003)〕 This article explains the development of the model and its use in Greenville County as an effort to address NPDES stormwater permit conditions. Another similar article was presented at the 2003 EWRI annual conference.〔Barfield, B.J., J.C. Hayes, K.F. Holbrook, B. Bates, J. Gillespie, and J. Fersner. 'IDEAL: A model of runoff, TSS, and nutrient yield from small urban watersheds.' Proceedings of the 2003 EWRI Annual Meeting, Philadelphia, PA, June 23–26. ASCE, New York. 2003.〕
The U.S. Environmental Protection Agency (EPA) funded a Best Management Prcetice design manual developed in part by Barfield.〔The three-volume manual is available from the EPA webpage at (epa.gov )〕
== Development history ==
The IDEAL was conceived in 2000 in response to a request for proposals from the South Carolina Department of Health and Environmental Control (SCDHEC). SCDHEC is the state agency responsible for implementing the NPDES program of the Clean Water Act in South Carolina. The model was originally developed for coastal areas of South Carolina to help civil engineers meet state water quality standards. A version for Greenville County, SC, USA was released in 2004 and in currently supported. The model has recently been re-programmed into VB.net object-oriented programming framework after initially formulation as a spreadsheet.
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