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L-THIA: Evaluating Long-Term Impacts of Land Use Change

The L-THIA model estimates the impact of land use change on runoff and non-point source pollution. It assesses flooding, property damage, stormwater drainage, erosion, and downstream flooding. It also evaluates long-term impacts such as surface water quantity and quality reduction, decreased groundwater recharge, and adverse effects on aquatic life.

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L-THIA: Evaluating Long-Term Impacts of Land Use Change

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  1. L-THIALong-Term Hydrologic Impact Assessment Model ….provides relative estimates of change of runoff and non point source pollutants caused due to land use change.

  2. Impervious cover and runoff ... • decreased groundwater recharge • downstream flooding due to increased runoff • rapid erosion of stream banks • pollutants in runoff adversely affect aquatic life

  3. Short-term impacts of land use change • flooding • property damage • increased storm water drainage • economic impacts

  4. Long-term impacts of land use change • Increase in surface water quantity • Decrease in surface water quality • Decreased groundwater recharge … eventually affecting municipal supplies • Increased downstream flooding • Adverse affect on aquatic life

  5. Non-point Source (NPS) Pollution • Originates from diffuse sources as a response to • Land use • Storm events • Stormwater runoff from • Agricultural lands, construction sites, urban areas • Long-term impacts • Storage (lake) loss from sediment deposition • Adverse effect of chemical pollutants

  6. 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

  7. Potential applications of L-THIA • assess what can be done to minimize impact of development • a criteria in the site selection process for land use change • input parameter for land use zoning by planners and decision makers

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