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Identifying opportunities and evaluating stormwater practices in ultra-urban catchments.

Identifying opportunities and evaluating stormwater practices in ultra-urban catchments. Neely L. Law Sally Hoyt October, 2006. About the Center for Watershed Protection. Non-profit 501(c)3, non-advocacy organization Work with watershed groups, local, state, and federal governments

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Identifying opportunities and evaluating stormwater practices in ultra-urban catchments.

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  1. Identifying opportunities and evaluating stormwater practices in ultra-urban catchments. Neely L. Law Sally Hoyt October, 2006

  2. About the Center forWatershed Protection Non-profit 501(c)3, non-advocacy organization Work with watershed groups, local, state, and federal governments Provide tools communities need to protect streams, lakes, and rivers 20 staff in Ellicott City, MD www.cwp.org www.stormwatercenter.net

  3. Watershed 263 Catchment F Watershed 263 Catchment O Location Map Watershed 263 Catchments

  4. Deriving Reliable Pollutant Removal Rates for Street Sweeping and Storm Drain Cleanout Programs in the Chesapeake Bay Basin • US EPA Chesapeake Bay Program • Center for Watershed Protection (CWP) • UMBC (Engineering, CUERE) • City of Baltimore, DPW • Baltimore County, DEPRM • USDA Forest Service, Baltimore Ecosystem Study • Watershed 263 BMP Theme Park • Chesapeake Bay Trust Pioneer Grant • City of Baltimore, DPW • Maryland Department of Environment • Center for Watershed Protection (CWP) • EA Engineering

  5. Stormwater Management Strategy for Catchment O in Watershed 263 Prepared for: Parks and People Foundation Prepared by: Center for Watershed Protection Through a grant from: Chesapeake Bay Trust April 2005

  6. Assessment of Relative Dirtiness of Streets in Catchment O(CWP 2005)

  7. Streets and Storm Drain Inlet Conditions The Good The Bad The Ugly

  8. Storm EMCs for TSS, TN and TP(9/28/05 – 1/31/06) Catchment O: Baltimore St; Catchment F: Lanvale St.

  9. Street Sweeping and Storm Drain CleanoutStudy Purpose Need more reliable estimates of the potential nutrient and sediment reductions achieved by municipal street sweeping and storm drain cleanouts • Municipalities are sweeping and cleaning storm drains – can it make a difference in reducing nutrient loads to Bay?

  10. Project Study Tasks Task 1: Literature Review and Reference Tracking System Task 2: Basin-wide Municipal Practices Survey Field monitoring program Task 3: Paired Street Sweeping Treatment Task 4: Street Source Area Sampling Task 5: Characterization of Stormdrain Sediment

  11. Study Design for Street Sweeping Treatments • 2 yr. (10-05 thru 9-07) • Paired watershed • Catchment F • 85% reduction in curb miles swept • 1x/week • Catchment O • 48% increase in curb miles swept • 2x/week • Vacuum street sweeper • Bedload samples

  12. Task 1: Literature ReviewInterim Pollutant Removal Rates for Sweeping Discounted for: • Solubility • Washoff & fugitive dust loss • Frequency • Technology • Parked cars • Street conditions • Runon

  13. Task 1: Literature ReviewInterim Rates for Catchbasin Cleanouts • Discounted for • Frequency • Particle size distribution of dirt load • % catch basin or inlet full • Cleanout method

  14. Task 2: CB Municipal Practice Survey • 43 questions • 4 section • Community condition • Street Sweeping practice • Stormdrain maintenance • Monitoring • 73% response rate

  15. Survey Key Findings • $13 million/year sweeping and cleanouts • 70% of Phase I and II communities sweep at least 1x/year • 85% of Phase I and II communities sweep more frequently than annually • $14.75 to $75/curb mile • Aesthetics and residential demand

  16. Key Findings: Storm drain cleanout • Of 20 responses, • 8 regular schedule cleanouts • 12 response to complaints or clogging • $1.40/linear ft; $55/catchbasin

  17. Watershed 263 BMP Theme Park City of Baltimore, DPW – Environmental Services Division Center for Watershed Protection – Site and practice selection. Virtual Tour. EA Engineering – Final design and construction drawings.

  18. BMP Theme Park - What • Design and Construct 5-7 BMP’s to filter rainwater • BMPs that are new/seldom used in the Chesapeake Bay region • Create a website “tour” so others – citizens and engineers – can learn.

  19. BMP Theme Park - Timeline

  20. Retrofit types • Biofiltration in ROW • Biofiltration in vacant lots • Catch basin inserts • Stormwater planters • Sand filters in ROW/underground Treatment of up to 26% of the 39-acre catchment with 7 retrofits.

  21. Biofiltration in ROW-15 Possible Locations(Drainage areas 0.3-1.7 acres)

  22. BMP Selection CriteriaBiofiltration • Roadway slope (max 4%) • Utility locations • Street width (>40 ft.) • Downstream inlet with invert minimum 2’ below grade • On-street parking • Traffic volume

  23. Virtual Tour • Website for the constructed and non-structural practices. • Resources for citizens and technical audience. • Practice descriptions and technical spec downloads. • Photos and a printable brochure.

  24. Other CWP Work of Interestwww.cwp.orgwww.stormwatercenter.net • Small Watershed Restoration Manual Series • Maryland Watershed Users Guide • Smart Watershed Benchmarking Tool • Urban Watershed Forestry Manuals • Wetland and Watersheds Articles

  25. Catchment F (38.43 acres) Monitoring Station

  26. Catchment O (38.7 acres) Monitoring Station

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