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Introduction to Impervious
L-THIA
Based on more than 30 years of
daily precipitation data for the United States,
L-THIA estimates changes in runoff and nonpoint
source pollution resulting from past or proposed
development. In this model of L-THIA, users only
need to input:
- their location (state and
county);
- the type of soil in the area
where the land use change is to occur (available
online if unknown); and
- the impervious percentage
by land type, and type and size of land use
change that will occur (e.g., 100 acres of agricultural
land converted to 50 acres high-density residential
and 50 acres commercial).
L-THIA will generate estimated
runoff volumes and depths, and expected nonpoint
source pollution loadings to waterbodies, based
on the information provided by the user. Results
can be displayed in tables, bar charts, and pie
charts.
The Impervious L-THIA version is best suited for urban land use change analysis.
HOW TO USE THE %
IMPERVIOUS AREA INPUT
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