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Stormwater Management in the City of Annapolis Raycine M. Hodo - - PowerPoint PPT Presentation
Stormwater Management in the City of Annapolis Raycine M. Hodo - - PowerPoint PPT Presentation
Stormwater Management in the City of Annapolis Raycine M. Hodo Environmental Compliance Inspector City of Annapolis Watershed Implementation Plan 12 sub-watersheds 15 miles of natural streams 38.5 percent impervious Residential
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City of Annapolis
Watershed Implementation Plan
- 12 sub-watersheds
- 15 miles of natural
streams
- 38.5 percent impervious
- Residential
Neighborhoods
- Commercial and
Industrial Areas
- Institutional Properties
- State and County Roads
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Project Goals
- Comply with regulatory requirements including the 20%
impervious area reduction
- Improve water quality
- Reduce runoff from rain events there by reducing
localized flooding
- Improve overall health of natural resources in the City
- Support storm water utility
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CHESAPEAKE BAY TMDL
TMDL in 2010 for:
- Sediment
- Nitrogen
- Phosphorus
Target Reductions for 2025
- 25% less Nitrogen
- 24% less Phosphorus
- 20% less Sediment
Target Reductions for 2017
- 60% of 2025 target reductions
to be achieved
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STORM WATER MANAGEMENT INVENTORY
Summary of Inventory
Total Number Design Plan Sets Scanned 351 Total Number of Pages Scanned 1,725 Total Number of BMPs Identified 741
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UPCOMING PROJECT TASKS
Pollutant Load Modeling
- Existing conditions
- Proposed conditions
Stormwater Management Concepts
- 30% design
- Detailed cost estimate
- Utilities impacts
- Environmental impacts
- Recommended maintenance
Evaluation and Ranking
- Implementation Cost
- Impervious area credits
- Pollutant Removal
Final report
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Considerations
Challenge
- Funding
Solution
- Storm water utility
- Grants
- Chesapeake Bay Trust
- Maryland Department of
Natural Resources (MD DNR) Grants
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Installing Stormwater Management Facilities
- Stormwater Design Manual
2000 Volume I and II serves as the guide for stormwater management principles
- Describes the Environmental
Site Design (ESD) to the Maximum Extent Practicable (MEP)
- ESD is Stormwater design
strategies that seek to replicate natural hydrology
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When is a Permit Required?
- Limit of Disturbance (LOD)
– Waterfront lot with greater than 2000 SF of disturbance – Non-Waterfront lot with greater than 5000 SF
- f disturbance
- Excavation and Fill exceeds 100 CY total.
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Grading Permits – The Three Phase Process
- Concept Approval
– Makes sure the overall design will work in theory – This may be covered in P&Z submission or FCA submission
- Design Approval
– Develops the design to construction ready documents – Review is completed by several departments including P&Z, DPW and DNEP
- Final Design Approval
– Final Design is sent to AASCD for approval – Collection of Bonding associated with the project – Development of Stormwater Maintenance Agreement
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Stormwater Management Credit
- Stormwater Management Credit
Application for Residential
- Site Plan showing property lines
and location of stormwater management device.
- For stormwater facilities installed
through a grading permit with the City: A copy of the Stormwater Management Facility Maintenance Agreement.
- Schedule a site visit which will be
performed to verify your application.
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Thanks
- AECOM
- Matthew Waters, Stormwater
Management Engineer
- Frank Biba, Chief Environmental
Programs
- Maria Broadbent, Director DNEP
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