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Long Term Hydrologic Impact Analysis (L-THIA)

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Basic Spreadsheet L-THIA Great Lakes Watershed Management Project

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midwest US states

L-THIA estimates changes in recharge, runoff, and nonpoint source pollution resulting from past or proposed development.

It estimates long-term average annual runoff for land use and soil combinations, based on actual long-term climate data for that area

pictures of land

  For additional information, contact:  
 Bernie Engel, Purdue University  email: engelb@purdue.edu
Larry Theller, Purdue University  email: theller@purdue.edu
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