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Purdue Status Report

Purdue Status Report. Summer Meeting 2012 Midwest Spatial Decision Support Interest Group Region 5 EPA July 9, 2012. Bernie Engel, Larry Theller, Youn Shik Park, Laurent Ahiablame. Agricultural and Biological Engineering Purdue University. Topics. L-THIA LID improvements

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Purdue Status Report

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  1. Purdue Status Report Summer Meeting 2012 Midwest Spatial Decision Support Interest Group Region 5 EPA July 9, 2012 Bernie Engel, Larry Theller, Youn Shik Park, Laurent Ahiablame. Agricultural and Biological Engineering Purdue University

  2. Topics • L-THIA LID improvements • Fox River Project update (L-THIA Owls)

  3. Effectiveness of low impact development practices in two urbanized watersheds: Retrofitting with rain barrels/cisterns and porous pavements Laurent Ahiablame Prof. Bernard Engel, Prof. IndrajeetChaubey

  4. The Problem • How effective are LID practices at the watershed scale? • LID practices - lot level control measures • Current focus of research – runoff management with LID practices. • Impacts of LID practices on baseflow need to be investigated • at the lot scale • at the watershed scale

  5. How to Proceed? • Monitoring – most appropriate (perhaps), expensive, time consuming, sometimes impossible. • Modeling – convenient, less expensive, time efficient, sometimes may be complex. • Modeling – L-THIA-LID

  6. L-THIA Modeling of LID Practices • Standard procedure for LID modeling • Representation of LID practices • CN values • Consideration of design guidelines • Sizing factors • Computation of runoff, baseflow, total flow • Threshold area: IF watershed area ≥ 120 ha => baseflow • Computation of LID effectiveness index • Baseflow core equation • Regression model for Indiana conditions • Relationship between baseflow and LID practice • BFI versus CN • Baseflow pollutant coefficients

  7. Improving L-THIA-LID • LID practices currently represented in L-THIA-LID • Bioretention/rain garden • Open wooded space • Porous pavement • Swale • Porous pavement + swale • Permeable patio • Green roof • Disconnected impervious surfaces

  8. Improving L-THIA-LID Runoff (distributed approach) Baseflow LID Effectiveness Index L-THIA-LID Interface (VBA)

  9. Little Eagle creek • Little Buck creek

  10. Little Eagle Creek LID Scenario Runs: 1991-2010 Effectiveness of LID practices

  11. Little Buck Creek LID Scenario Runs: 1991-2010 Effectiveness of LID practices

  12. Summary • Simulated runoff, baseflow, and total flow for the baseline compared well with observed values during calibration and validation periods. • Calibration: R2 and NSE > 0.5 • Validation: R2 > 0.4; NSE > 0.3 • Effectiveness of LID practices at the watershed scale • Runoff + pollutants: 2 to 12% • Baseflow + pollutants: -1 to -2% • Total flow + pollutants: 1 to 9% • Good LID options for retrofitting in urbanized watershed • 25% rain barrel/cistern adoption • 25% porous pavement adoption • 25% rain barrel/cistern + 25% of porous pavement adoption

  13. “Fox River” Project • Corps 516(e) project is collaboration with Michigan State University Institute of Water Research. • Tools work together behind the interface. • High-resolution data for 4 Priority Watersheds. • Medium-resolution data for entire Great Lakes area.

  14. Extends L-THIA online tool to entire Great Lakes area.

  15. Floating, semi-transparent toolbars, collapsible menus, open architecture for partners, improved editing performance. New Area of Interest tool : Polygon “Select by HUC” to use a single HUC 12, 10, 8 outline.

  16. Tool will now allow use of a polygon as an area of analysis. This will improve ability to model zoning and LID BMP areas.

  17. -Display of HIT target layers -EPA Waters layers -GIS layers -Multi-resolution data layers

  18. New Results Options

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