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L ong- T erm H ydrologic I mpact A ssessment ( L-THIA ) Model

L ong- T erm H ydrologic I mpact A ssessment ( L-THIA ) Model. 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. L-THIA Model concepts. charge.

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L ong- T erm H ydrologic I mpact A ssessment ( L-THIA ) Model

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  1. Long-Term Hydrologic Impact Assessment (L-THIA) Model • 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

  2. L-THIA Model concepts charge • Curve Number (CN) based approach • Uses 30 years of precipitation data to predict yearly runoff • Precipitation data is used to estimate the Antecedent Moisture • Content (AMC) in the soil, the CN is adjusted accordingly • Event Mean Concentration (EMC) is used to estimate Non • Point Source (NPS) pollution

  3. Data requirements and components for analysis in L-THIA Land use Curve Number values Soils Runoff depths Location Daily precipitation NPS pollutants map Runoff volumes map User supplied information Performed by L-THIA

  4. Availability at present… charge • L-THIA WWW in a spreadsheet version that models • runoff and nps pollution changes • L-THIA GIS - set of Avenue scripts that automate the • process of runoff impact modeling within ArcView • L-THIA GIS WWW allows interactive mapping of the • area of interest with a custom java interface within • a web browser

  5. charge online spreadsheet version online GIS version Availability of L-THIA (http://www.ecn.purdue.edu/runoff) Downloadable Avenue codes executable within ArcView

  6. Development of the L-THIA WWW System charge Land use and hydrologic soil group provided by user and long term daily precipitation data queried from ORACLE database. LTHIA/NPS generates runoff and NPS pollution output in tabular and graphical representations - bar and pie chart form

  7. Development of the L-THIA GIS WWW System charge Java, JavaScript, ArcView Internet Map Server (IMS), Netscape Server and Avenue Scripts in ArcView are used. URL Request by Java Applet  Netscape Server  URL parse by ArcView IMS  Execute ArcView Avenue Scripts in LTHIA/NPS GIS

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