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Bernie Engel Purdue University

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Web-based DSS Tools Online Watershed DelineationOnline Watershed Delineation L-THIA & L-THIA LIDL-THIA & L-THIA LID Watershed Management SystemsWatershed Management Systems Burns Ditch (Indiana) Swan Creek (Ohio) Flow and Load Duration CurvesFlow and Load Duration Curves

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L-THIA Model Long-Term Hydrologic Impact Assessment Average annual runoff NPS pollution An overview / screening model User friendly tool Does not require detailed data input Identifies need for more detailed modeling Provides "What-If" alternatives evaluation scenarios

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Data requirements and components for analysis in L-THIA Soils Land use Curve Number values Daily precipitationLocation Runoff depths NPS pollutants Runoff volumes User supplied information Performed by L-THIA L-THIA Model

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

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Purdue University is an Equal Opportunity/Equal Access institution. LTHIA-Web with Online Watershed Delineation Region 5 States, visible on Google Maps . Flowshed is calculated from point and landuse and soil characteristics are loaded into model. https://engineering.purdue.edu/~lthia/

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Purdue University is an Equal Opportunity/Equal Access institution.

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Landuse and Soil are automatically entered into spreadsheet

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Tabular and Graphic results Purdue University is an Equal Opportunity/Equal Access institution.

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Web-based Tool for Flow and Load Duration Curve Development

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Web-Based Flow Duration and Load Duration Curve Tool https://engineering.purdue.edu/~ldc

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Google Maps-Based Models Purdue University is an Equal Opportunity/Equal Access institution.

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Flood Conditio ns 100 cfs FDC, LDC and Target Concentration (2002-2007) for USGS Gauge 04180000, Cedar Creek, IN WQ Target (0.10 ppm) FDCLDC Target Concentration Enter / Upload Flow and WQ Data for LDC

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Click this button to Generate FDC only You can enter USGS gauge number to retrieve flow data Select beginning and Ending dates You can select and click here to retrieve USGS flow data Retrieve USGS Flow Data and Enter /Upload WQ Data for LDC

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Summary These tools enable decision makers to formulate watershed management plans to meet goals Allows stakeholders to understand impacts of water quantity and quality resulting from land use change For more information: https://engineering.purdue.edu/~ldc