Fremont Lake Watershed Modeling

PLOAD L-THIA NPS ISAT

PLOAD

The U.S. EPA's Pollutant Loading Model (PLOAD) calculates pollutant loadings for sub-basins using the different land use and cover periods (1978, 1998, and 2005), hydrologic soil groups, and precipitation. The PLOAD model results demonstrate across the board increases from 1978 to 2005 in total nitrogen, total phosphorus, and total suspended solids for the Fremont Lake Watershed. This increase is a result of the change in land use and cover (increase in urban/built up lands) and could also be due to changes in the amount of precipitation.


Fremont Lake 2005 PLOAD Total Nitrogen Fremont Lake 2005 PLOAD Total Phosphorus Fremont Lake 2005 PLOAD Total Suspended Solids
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LTHIA-NPS

The U.S. EPA's Long-Term Hydrologic Impact Assessment and Nonpoint Source Pollutant (LTHIA-NPS) model was used to evaluate stormwater runoff status in the Fremont Lake Watershed. The model runs for the LTHIA-NPS program were intended to be compared to the PLOAD outputs for the Fremont Lake Watershed. The LTHIA-NPS model shows that during a rain event, the highest volume of runoff comes from Daisy Creek, Fremont Drain, and Brooks Creek sub-basins.


Fremont Lake 2005 LTHIA-NPS Runoff Volume for Average Annual Rainfall Fremont Lake 2005 LTHIA-NPS Runoff Depths for Average Annual Rainfall
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ISAT


Fremont Lake 2005 ISAT Impervious Surface Analysis
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