Citation:

Berner, J., M. Simon, M. Tryby, S. Struck, D. Pankani, AND M. Deerhake. NATIONAL STORMWATER CALCULATOR: LOW IMPACT DEVELOPMENT STORMWATER CONTROL COST ESTIMATION PROGRAMMING & FUTURE ENHANCEMENTS. Presented at 89th Technical Exhibition and Conference, New Orleans, Louisiana, September 24 - 28, 2016.

Impact/Purpose:

Presentation to WefTEC Conference on September 25, 2016 in New Orleans, Louisiana

Description:

National Stormwater Calculator: Low Impact Development Stormwater Control Cost Estimation Programming & Future EnhancementsJason Berner1; Michael Tryby1; Scott Struck2, Dan Pankani2, Marion Deerhake3, Michelle Simon11. USEPA2. GeoSyntec, Inc.3. RTI, Inc.The National Stormwater Calculator (NSC) makes it easy to estimate runoff reduction when planning a new development or redevelopment site with low impact development (LID) stormwater controls. The Calculator is currently deployed as a Windows desktop application. The Calculator is organized as a wizard style application that walks the user through the steps necessary to perform runoff calculations on a single urban sub-catchment of 10 acres or less in size. Using an interactive map, the user can select the sub-catchment location and the Calculator automatically acquires hydrologic data for the site.A new LID cost estimation module has been developed for the Calculator. This project involved programming cost curves into the existing Calculator desktop application. The integration of cost components of LID controls into the Calculator increases functionality and will promote greater use of the Calculator as a stormwater management and evaluation tool. The addition of the cost estimation module allows planners and managers to evaluate LID controls based on comparison of project cost estimates and predicted LID control performance. Cost estimation is accomplished based on user-identified size (or auto-sizing based on achieving volume control or treatment of a defined design storm), configuration of the LID control infrastructure, and other key project and site-specific variables, including whether the project is being applied as part of new development or redevelopment. The cost module accounts for potential constructability and site constraints such as permeability, slope, and other factors that may result in different LID control sizes and configurations and associated additional expenses. It is expected that the cost module will enable planners and managers to identify cost-effective planning level decisions for LID projects by allowing comparisons of different LID project cost scenarios. This presentation will provide instructions and guidance on how to appropriately use the cost module; including case studies of real-world project costs compared to estimates from the Calculator. It will also cover future planned enhancements to the Calculator, including a web-based version of the tool and a trainer of trainers narrated online presentation. Scott Struck, Ph.D. Geosyntec Consultants 1376 Miners Drive, Suite 107 B, Lafayette, CO 80026 SStruck@Geosyntec.com P: (303) 586-8194F: Dan Pankani, P.E. GeosyntecConsultants 621 SW Morrison St., Suite 600,Portland, OR 97205 DPankani@Geosyntec.com P: (971) 271-5896 F:Marion Deerhake RTI P.O. Box 12194 Research Triangle Park, NC 27709 med@rti.org P: (919) 316-3410 F: Jason Berner U.S. EPA, Office of Research & Development Berner.Jason@epa.gov 1200 Pennsylvania Ave., NW, MC: 1807T P: (202) 566-1671 Washington, DC 20460 F: (202) 566-2200 Michael Tryby U.S. EPA, Office of Research & Development26 West Martin Luther King Drive Cincinnati, OH 45268 Tryby.Michael@epa.gov P: (513) 569-7559 F: (513)Michelle Simon U.S. EPA, Office of Research & Development Simon.Michelle@epa.gov 26 West Martin Luther King Drive P: (513) 569-7469 Cincinnati, OH 45268 F: (513)

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