{"metadata": {"source_document": "NJ BMP", "version_year": "2004", "chapter_subchapter": "Chapter 3", "citation": "BMP 2004, Ch 3, p. 11", "topic": "Table 3-1: Pollutant Loads by Land Cover"}, "programmatic_checks": {}, "content_markdown": "# Regional and Municipal Stormwater Management Plans\n\n## Table 3-1: Pollutant Loads by Land Cover\n\n|  Land Cover | TP load (lbs/acre/yr) | TN load (lbs/acre/yr) | TSS load (lbs/acre/yr)  |\n| --- | --- | --- | --- |\n|  High, Medium Density Residential | 1.4 | 15 | 140  |\n|  Low Density, Rural Residential | 0.6 | 5 | 100  |\n|  Commercial | 2.1 | 22 | 200  |\n|  Industrial | 1.5 | 16 | 200  |\n|  Urban, Mixed Urban, Other Urban | 1.0 | 10 | 120  |\n|  Agriculture | 1.3 | 10 | 300  |\n|  Forest, Water, Wetlands | 0.1 | 3 | 40  |\n|  Barrenland/Transitional Area | 0.5 | 5 | 60  |\n\nSource context and notes:\n\nSource revision: February 2004.\n\nunderdeveloped areas by regulation, the implementation of BMPs and their impacts on loading should be incorporated into the analysis.\n\nTo calculate pollutant loads from land uses for both current and build-out conditions, the table of values below for total suspended solids, nitrogen, and phosphorus can be used for a broad perspective on a municipal level. To utilize the table, relate the zones on the zoning map to the listed land uses. Other pollutant loading values may also be used provided that the values are a better depiction of the municipality. Pollutant loads are required for each HUC14 in the municipality. For each land use within the HUC14, multiply the total acreage by the assigned load factor, which is given in pounds per acre per year. The total pollutant load for the HUC14 will be the sum of the loads for each land use.\n\nTable 3-1: Pollutant Loads by Land Cover\n\n\n|  Land Cover | TP load (lbs/acre/yr) | TN load (lbs/acre/yr) | TSS load (lbs/acre/yr)  |\n| --- | --- | --- | --- |\n|  High, Medium Density Residential | 1.4 | 15 | 140  |\n|  Low Density, Rural Residential | 0.6 | 5 | 100  |\n|  Commercial | 2.1 | 22 | 200  |\n|  Industrial | 1.5 | 16 | 200  |\n|  Urban, Mixed Urban, Other Urban | 1.0 | 10 | 120  |\n|  Agriculture | 1.3 | 10 | 300  |\n|  Forest, Water, Wetlands | 0.1 | 3 | 40  |\n|  Barrenland/Transitional Area | 0.5 | 5 | 60  |\n\n\nNote: References for Table 3-1 are provided at the end of this chapter.\n\nThe build-out analysis can go further than the requirements in the regulations. In addition to pollutant loads and impervious surfaces, the analysis can be used to assess open space plans, and to project school population and demand on municipal services. The build-out analysis can greatly benefit a municipality by envisioning its future so that steps can be taken to prevent unwanted impacts or plan for future needs. Finally, the build-out analysis should include a summary with critical findings, conclusions, and recommendations.\n\nIt is important to note that, although the pollutant loads for agricultural lands are higher than those for low density residential for the parameters in Table 3-1, converting agricultural lands to residential typically results in an increase in pollutant loads for metals and petroleum hydrocarbons; it is recommended that each municipality calculate build-out pollutant loads for each. Also, the total load of suspended solids due to stormwater runoff may decrease due to the conversion of agricultural lands to low density residential, but the percentage of impervious surfaces increases dramatically. If increases in stormwater runoff flows, due to the increase of impervious surfaces, are not managed properly, these high flows will increase stream bank erosion, thereby increasing sediment loads to the receiving waters.\n\n[Source PDF](SOURCE.pdf#page=11)"}