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-THIA Model concepts
Data requirements and components for analysis in L-THIA
Curve Number values
NPS pollutants map
Runoff volumes map
User supplied information
Performed by L-THIA
Availability at present…
online spreadsheet version
online GIS version
Availability of L-THIA
Downloadable Avenue codes
executable within ArcView
Development of the L-THIA WWW System
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
Development of the L-THIA GIS WWW System
URL Request by Java Applet Netscape Server URL parse by ArcView IMS Execute ArcView Avenue Scripts in LTHIA/NPS GIS