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Presented to: Severn River Association 2008 State of the Severn

Anne Arundel County Government Department of Public Works Ron Bowen, P.E. Presented to: Severn River Association 2008 State of the Severn. October 21, 2008. Anne Arundel County Impervious Areas. Historical Urbanization. vs. New Development.

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Presented to: Severn River Association 2008 State of the Severn

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  1. Anne Arundel County Government Department of Public Works Ron Bowen, P.E. Presented to: Severn River Association 2008 State of the Severn October 21, 2008

  2. Anne Arundel County Impervious Areas Historical Urbanization vs. New Development Our “greatest challenge” is restoration of those areas developed in an era when storm water management was non-existent or much less than it is today. . .

  3. Landcover Acres Impervious Acres Impervious % of Landcover % of Total Impervious Landcover Commercial(Private Lands) 76 % 16 % 1,971 1,505 Industrial (Private Lands) 506 381 75 % 4 % Residential (Private Lands) 16,332 4,001 24 % 43 % Gov’t Owned (Public Lands) 10,219 2,956 29 % 32 % Other (Private Lands) 15,325 447 3 % 5 % Total 44,353 9,290 21 % 100 % Severn River Watershed Impervious Cover

  4. EPA/MDE Clean Water Act Listed Impaired Waters Severn River Pollutant Impairments • Bacteria – Fecal Coliform for Shellfish Harvesting TMDL issued • Biological (combination Benthic/Fish) • Nutrients (Total Nitrogen and Total Phosphorous) • Sediments • Toxics (PCB in Fish Tissue)

  5. Severn River Watershed Total Nutrient Loads from Stormwater and Septics • Total Nitrogen (TN) • TN (lbs/yr) - Existing • TN (lbs/yr) - Buildout • % Increase • Total Phosphorous (TP) • TP (lbs/yr) - Existing • TP (lbs/yr) - Buildout • % Increase • = 449,629 • = 490,257 • = 9 % • = 25,594 • = 27,117 • = 6 %

  6. Severn River Watershed Annual Nitrogen Load Critical Area 104,975 lbs/year Existing Septic Systems Non-Tidal Surface Streams 112,342 lbs/year All Remaining Areas 22,032 lbs/year Total 239,349 lbs/year

  7. Septic Systems within the Severn River Recommended Retrofits

  8. Severn River Watershed Subwatershed Condition Assessment for Restoration Best Overall Conditions Worst Overall Conditions City of Annapolis

  9. Severn River Watershed Stream Restoration Challenge 178 miles of total non-tidal streams 25 miles are degraded streams Rated poor to very poor Degraded Streams Stream Reaches

  10. Severn River Watershed Stormwater Controls Percent % Acres -- 44,213 Watershed Area Managed Area 14 6,370 Managed Public Area 3,864 60 40 Managed Private Area 2,506 Note: Only 19% of current Stormwater controls provide water quality treatment Management Areas have varying degrees of impervious contribution (Avg 21%)

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