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Pollutant Budget Estimation Form

General Pollutant Budget Information
The pollutant budget spreadsheet provides a rough estimate of the effects of present or future land use activities on nutrient loading to water resources. The spreadsheet uses the export coefficient model to calculate loading. The export coefficient model is the simplest type of pollutant runoff model because all factors that effect pollutant movement are combined into one term, the export coefficient. The total nutrient load (in kg/yr) is calculated by multiplying the land use acreages (ha) by the export coefficients (kg/ha/yr) for various activities, such as corn, pasture, and residential use and summing the products. Export coefficients for the various land uses have been obtained from literature searches.

How to Use This Spreadsheet
Enter the acreage for your various land uses. Several different organizations may be able to provide you with land use data: your local USDA -Consolidated Farm Service Agency or the conservation district office or county officials. If your water resource is used for drinking water supply, the water authority may have land use data for the watershed.

The spreadsheet will automatically calculate the individual and total land use loads and load percentages. You can use these calculations to help you determine your major sources of nutrient pollution. To continue your watershed assessment and evaluation, return to the Pollutant Source Page by clicking the back button and then select your major pollutant source from the list provided.

Pollutant Budget Estimation Using Export Coefficient Model
Land Use Area
(ha) 		Nitrogen Export
Coefficient
(kg/ha/yr) 		Total Nitrogen
Load (kg/yr) 		%age of
Nitrogen Load 		Phosphorous
Export
Coefficient (kg/ha/yr) 		Total Phosphorous
Load (kg/yr) 		%age of
Phosphorous
Load
Forest 1.8 ?? ?? 0.11 ?? ??
Corn 11.1 ?? ?? 2.0 ?? ??
Cotton 10.0 ?? ?? 4.3 ?? ??
Soybeans 12.5 ?? ?? 4.6 ?? ??
Small Grain 5.3 ?? ?? 1.5 ?? ??
Pasture 3.1 ?? ?? 0.1 ?? ??
Feedlot
Dairy 		2900 ?? ?? 220 ?? ??
Idle 3.4 ?? ?? 0.1 ?? ??
Residential 7.5 ?? ?? 1.2 ?? ??
Business 13.8 ?? ?? 3.0 ?? ??
Industrial 4.4 ?? ?? 3.8 ?? ??
Total ?? - ?? ?? - ?? ??

Agricultural coefficients are from:

Reckhow, K.H., M. N. Beaulac, and J.T. Simpson. 1980. Modeling phosphorous loading and lake response under uncertainty: a manual and compilation of export coefficients. USEPA. 440/5-80-011. Washington, DC.

Urban coefficients are from:

Athayde, D.N., P.E. Shelley, E.D. Driscoll, D. Gaboury and G.B. Boyd. 1983. Results of the Nationwide Urban Runoff Program: Final Report. USEPA. USEPA Water Planning Division. Washington, DC.