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Web-based Low Impact Development Decision Support and Planning Tool

Web-based Low Impact Development Decision Support and Planning Tool. Bernie Engel, Larry Theller, James Hunter Purdue University. Low-Impact Development (LID). An approach to land development to mimic the pre-development site hydrology to:. Reduce volume of runoff

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Web-based Low Impact Development Decision Support and Planning Tool

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  1. Web-based Low Impact Development Decision Support and Planning Tool Bernie Engel, Larry Theller, James Hunter Purdue University

  2. Low-Impact Development (LID) An approach to land development to mimic the pre-development site hydrology to: • Reduce volume of runoff • Decentralize runoff, diffusing flows into smaller retention/detention areas • Improve water quality • Encourage groundwater infiltration

  3. Minimization Reduce imperviousness Soil Compaction LID Major Components 1. Conservation (Watershed and Site Level) 2. Minimization (Watershed and Site Level) 3. Integrated Management Practices (Site Level) • Conservation • Forest/Woods • Infiltrable Soils • Storage, Detention & Filtration • Rain gardens • Drainage swales • Green roofs • Porous Pavement https://engineering.purdue.edu/mapserve/LTHIA7/lthianew/lidIntro.htm

  4. L-THIA LID Basic Application: Target preliminary goals at the watershed and site level • Reduce imperviousness • Conserve infiltratable soils • Conserve functional / sensitive landscape • Minimize land disturbances • Anticipate need for other LID practices to reduce NPS and stormwater volume

  5. L-THIA LID: Lot Level Screening Tool Application: Target preliminary goals by adjusting lot level features • Site Design & Development preparation • Narrowing impervious areas (sidewalks, driveways, roads) • Natural resource preservation • Heavy equipment use  compaction • Permeable paving materials • Vegetative roof systems • Bioretention cells • Vegetated swales /Filter strips • Rain barrels • Disconnect impervious areas

  6. Preliminary Evaluation of LID for Pendleton, IN

  7. Using web-based tools to delineate and capture watershed, land use, and soils data for L-THIA input

  8. Assumption For Max. Development Scenario • 983 Acres: Commercial / Mixed Residential • Most Agriculture 55% B Soils, 45% C Soils • Current CN = 78 • Post –Developed w/o LID CN = 84 • Post – Developed w/ LID CN  76-82

  9. Using L-THIA LID Basic – Reducing Impervious Surface by 10% Reduces runoff by 23%

  10. Using L-THIA LID Lot Level • Reduce street width from 26ft. to 18ft. • Rain barrels for Residential • Green Roofs for Commercial • Bioretention/Raingardens Reduces Post-developed runoff by 46% Purdue University is an Equal Opportunity/Equal Access institution.

  11. Summary • L-THIA LID is a screening tool to evaluate the benefits of LID practices • L-THIA LID provides an easy to use interface • Will enable decision makers to formulate watershed management plans to meet goals • Along with other tools, allows stakeholders to understand impacts of water quantity and quality resulting from land use change • https://engineering.purdue.edu/~lthia/

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