Region 1 nutrient reduction efficiency factors for sweeping impervious areas (USEPA 2017a).
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Frequency Sweeper technology Phosphorus reduction factor Nitrogen reduction factor
2/year (spring and fall) Mechanical Broom 0.01 0.01
2/year (spring and fall) Vacuum Assisted 0.02 0.02
2/year (spring and fall) High-efficiency Regenerative Air-Vacuum 0.02 0.02
Monthly Mechanical Broom 0.03 0.03
Monthly Vacuum assisted 0.04 0.04
Monthly High-efficiency Regenerative Air-Vacuum 0.08 0.08
Weekly Mechanical broom 0.05 0.06
Weekly Vacuum assisted 0.08 0.07
Weekly 0.10 0.10 High-efficiency Regenerative Air-Vacuum

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