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A Comparative Soil Conservation Service Curve Number (SCS CN) and L-THIA Based Method Estimation of Runoff for Historical Land Use Changes
In this case study the Long-Term Hydrologic Impact Analysis (L-THIA) model and a GIS based SCS Curve Number method were used to estimate average annual runoff and runoff for rainfall events with varying return periods, respectively, for the NASA J. F. Kennedy Space Center (KSC) area and Indian River Lagoon Basin (IRLB) in Florida for 1920, 1943 and 1990 land uses. The effects of historical land use changes on runoff volume in the Indian River Lagoon Basin and the NASA KSC area in Florida were evaluated. The effects of historical land use changes on runoff for "design" events and annual runoff are quantified. In assessing the long-term changes in runoff volumes from historical development, land use for 1920, 1943 and 1990 was utilized. This was done using the SCS CN method and the LTHIA CN approach.
The SCS (Soil Conservation Service) CN method
The Long-Term Hydrologic Impact Analysis (L-THIA) Method
