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
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
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/
Purdue University is an Equal Opportunity/Equal Access institution.
Landuse and Soil are automatically entered into spreadsheet
Tabular and Graphic results Purdue University is an Equal Opportunity/Equal Access institution.
Web-based Tool for Flow and Load Duration Curve Development
Web-Based Flow Duration and Load Duration Curve Tool https://engineering.purdue.edu/~ldc
Google Maps-Based Models Purdue University is an Equal Opportunity/Equal Access institution.
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
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
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