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1. Hydrological Simulation Program - FORTRAN (HSPF) [EPA_HSPF]
Hydrological Simulation Program - FORTRAN (HSPF) is a comprehensive package for simulation of watershed hydrology and water quality for both conventional and toxic organic pollutants. HSPF incorporates ...

2. Chesapeake Bay Program Community Watershed Model [CBPCWM]
The Chesapeake Bay Watershed Model estimates the delivery of nutrients and sediments to the Bay by simulating hydrologic and nutrient cycles, using inputs such as atmospheric nutrient deposition, ...

3. Nitrogen Index Tool [USDA_ARS_NIT]
The effectiveness of nitrogen fertilizer in maximizing agricultural production and increasing economic returns for farmers has led to its widespread use. However, when this element is applied to a ...

4. SPAtially Referenced Regressions On Watershed Attributes (SPARROW) Modeling of Surface-Water Quality [01-usgs_sparrow-01]
The SPARROW method uses spatially referenced regressions of contaminant transport on watershed attributes to support regional water-quality assessment goals, including descriptions of spatial and ...

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