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Estimates of County-Level Nitrogen and Phosphorus Date for Use in Modeling Pollutant Reduction

Published: June 01, 2009

This report documents the calculations and procedures for the preparation of the input data to the Watershed Model - HSPF Phase 5. These calculations are used for creating the calibration data as well as scenario data. They form the basis of the Nutrient and Sediment Scenario Builder tool. The data created in this tool include: manure and chemical fertilizer applications by each nutrient type, land use in acres, plant uptake (the monthly amount of total nitrogen and total phosphorus taken into the entire plant -- roots, and all above-ground parts), nitrogen fixation (the amount of N fixed by leguminous plants each month), area of soil that is not covered by residue or leaves and is available to be eroded, and the amount of nitrogen from septic system drainage fields.

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