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!
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.
Dec 18, 2015
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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!
Background
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
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
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
ProcedureBaltimore City Pilot Street Sweeping Program
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
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
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
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
Summary
Plans in the future…
•Need to keep collecting data
•Reduce the amounts of variability by increasing the frequency of sweeping
Any Questions…
Contact:
William P. Stack, ChiefWater Quality Management [email protected]
Norman [email protected]
Daisuke [email protected]
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