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Background
•The City wanted a pilot study before committing to wide-scale use of street sweeping as a BMP
•Watershed for the City’s nested stormwater monitoring site chosen for pilot study
Street Sweeping!
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Background
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Pilot Area Facts
•Moores Run Watershed Area – 2,335 acres
•Moores Run Watershed % Imperviousness – 33%
•Total Pilot Watershed Area (Within Moores Run Watershed) – 107 acres
•Pilot Watershed % Imperviousness – 34%
Background
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Pilot Area Facts
•Total Route Length – 22,424 feet
•Sweeping Path Width – 12 feet
•Total Area Swept (both sides of the street) – 12.35 acres
•Percentage of Pilot Watershed area swept – 11.6%
Background
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1. Every second and fourth Wednesday of the month, streets are swept in the pilot study area. After completing the route, the sweeper goes to the NW Transfer Station
Procedure
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ProcedureBaltimore City Pilot Street Sweeping Program
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Total Copper Storm EMCs (ppb)
Before After0
20
40
60
80
100
120
Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping Began
Copper concentration declined.
Findings
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Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping Began
Total nitrogen concentration declined.
Total Nitrogen Storm EMCs (ppm)Before After
0
2
4
6
8
10
Findings
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Hamilton Watershed Stormwater EMCs Compare Storms Before & After Street Sweeping Began
No reduction for total phosphorus.
Total Phosphorus Storm EMCs (ppm)Before After
0
0.4
0.8
1.2
1.6
2
Findings
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Summary
In Conclusion…
•The Street Sweeping Program is removing a tremendous amount of debris
•Signs of reductions in the Storm water samples
•Due to variability, it is hard to credit the reductions to the Street Sweeping Program
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Summary
Plans in the future…
•Need to keep collecting data
•Reduce the amounts of variability by increasing the frequency of sweeping
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Any Questions…
Contact:
William P. Stack, ChiefWater Quality Management [email protected]
Norman [email protected]
Daisuke [email protected]