Use of a Watershed Management Tool Use of a Watershed Management Tool to Facilitate Restoration and to Facilitate Restoration and
Preservation Preservation Presentation given by:Presentation given by:
Mary L. Searing, P.E.Mary L. Searing, P.E.
Watershed Program ManagerWatershed Program Manager
Office of Environmental & Cultural ResourcesOffice of Environmental & Cultural Resources
Anne Arundel CountyAnne Arundel County
September September 20042004
Anne Arundel CountyAnne Arundel CountyMarylandMaryland
Partnership ApproachPartnership ApproachThe Development of the Watershed Management Tool and its respective components is a result of an outstanding partnership from staff of the following:
Anne Arundel County Department of Public Works Office of Planning and Zoning Department of Inspection and Permits Department of Office of Information Technologies Office of Environmental and Cultural Resources Health Dept, Soil Conservation District, Rec & Parks
KCI Technologies, Inc. GeoNorth CH2M Hill Severn River Commission
Land Use IssuesLand Use Issues
Impervious area
Storm water pollution source
Habitat quality
Water quality
Flooding
http://www.deq.state.us/wqinfo/nonpoint/images/wpe25.jpg
Stormwater eventually feeds into our waterways.
Watershed Management:Watershed Management:Goals & StrategiesGoals & Strategies
Water Quality Point Sources Non-point Sources
Water Supply Surface Ground
Economic and Social Brownfield Reuse Ports and Navigation
Flood Hazard Reduction
Riverine Stormwater
Recreation Boating and Fishing Parks
Biodiversity Aquatic Riparian
Project AreaProject AreaProject AreaProject Area
Current project area is Severn River Watershed
Eventually incorporate all 12 watersheds of the County into the Watershed Management Tool
Project Methodology and Project Methodology and DataData Watershed and subwatershed delineations Existing land use Future land use Imperviousness data Soil data Topographic Information Flow paths Event mean concentrations (EMC) Best management practices (BMP) Pollutant removal efficiencies
Summary and Overview of Summary and Overview of Watershed Management ToolWatershed Management ToolSummary and Overview of Summary and Overview of Watershed Management ToolWatershed Management Tool
Utilized for: NPDES Permitting and
Compliance Watershed-Based Land
Management & Land Use Planning
Development Review Capital Improvement Planning
Overview of Functional Overview of Functional Components of WMT&VComponents of WMT&V
Allow Users to:BrowseQueryView GIS layersFuture map layershttp://gis-fire/mox42/index.cfm
Development Development Restoration & PreservationRestoration & Preservation
Severn RiverWatershed
Existing condition
Local Watersheds Targeted Local Watersheds Targeted Based on:Based on:
Restoration Needs Watershed Pollution Sources Local Concerns
Restoration Opportunities
Pollution prevention Stream restoration Enhancement Preservation Opportunity to construct
multiple projects & build upon existing projects
Future Conditions
Existing Land Use Plan Existing Land Use Plan Projected Land Use ChangesProjected Land Use ChangesExisting Land Use Plan Existing Land Use Plan Projected Land Use ChangesProjected Land Use Changes
Existing ConditionsFuture Conditions,
with Existing Regulations10%
42%
6%
6%
36%
Commercial, Industrial,Transportation
Residential
Agricultural, Row Crop
Open Space (turf)
Woods
12%
69%
2%
6%
11%
Note: Data does not include the City of Annapolis
Watershed Management Watershed Management AlternativesAlternatives
Construction BMPsErosionSediment
Commercial/Industrial BMPsWater qualityManufacturing pollution
Treatment BMPsRunoff Stormwater
Runoff Reduction BMPsLow Impact DevelopmentPreservation
Homeowner BMPsSurface water preventionSeptic System Upgrades
*BMP = Best Management Practice
Loading Rates of Loading Rates of Total Phosphorus for Total Phosphorus for Existing and Future Existing and Future ConditionsConditions
Loading Rates of Loading Rates of Total Phosphorus for Total Phosphorus for Existing and Future Existing and Future ConditionsConditions
0.30
0.40
0.50
0.60
TP (lb/ac/yr)
Considerations for Considerations for Revised Land Use Plan - Revised Land Use Plan - Possible Restoration Possible Restoration AlternativesAlternatives
Considerations for Considerations for Revised Land Use Plan - Revised Land Use Plan - Possible Restoration Possible Restoration AlternativesAlternatives
Bioretention Dry to Wet
Pond Retrofits Wetland
Mitigation Septic System
Upgrades
0.30
0.40
0.50
0.60
TP (lb/ac/yr)
Considerations for Considerations for Revised Land Use Plan – Revised Land Use Plan – Possible Preservation Possible Preservation AlternativesAlternatives
Considerations for Considerations for Revised Land Use Plan – Revised Land Use Plan – Possible Preservation Possible Preservation AlternativesAlternatives
Stream buffers and shoreline buffers (critical area)
Greenways (100% of plan)
Wetland mitigation sites
Cluster zoning
0.30
0.40
0.50
0.60
TP (lb/ac/yr)
Septic System Alternative ExampleSeptic System Alternative ExampleData Used in ModelingData Used in Modeling
Pollutant TP (g/day)
TN (g/day)
Normal System 2.5 12.0
Upgraded System 2.5 3.0
Septic System Alternative ExampleSeptic System Alternative ExampleExisting Land Use PlanExisting Land Use PlanExisting ConditionsExisting Conditions
Jabez Branch
Septic System Alternative ExampleSeptic System Alternative ExampleExisting Land Use PlanExisting Land Use PlanFuture ConditionsFuture Conditions
Jabez Branch
Cluster Zoning ExampleCluster Zoning ExampleWith Septic System AlternativesWith Septic System AlternativesNew Systems with Nitrogen TreatmentNew Systems with Nitrogen Treatment
Jabez Branch
Septic System Alternative ExampleSeptic System Alternative ExampleWith Septic System AlternativesWith Septic System AlternativesNew Systems with Nitrogen TreatmentNew Systems with Nitrogen Treatment& Retrofit Existing Systems& Retrofit Existing Systems
Jabez Branch
Septic System AlternativesSeptic System AlternativesSeptic System AlternativesSeptic System AlternativesTotal Nitrogen Loading Comparison
What does WMT&V Provide?What does WMT&V Provide?
Data Management & Maintenance Data Viewer with Metadata Dynamic Models to Perform
Scenarios Project Management Watershed-scale Assessments
Better Decisions for a Better Future
For more information For more information contact:contact: www.severn-river-watershed.com www.aacounty.org/LandUse/OECR/
WatershedManage.cfm
ORContact Mary Searing at:2664, Riva roadAnnapolis, MD 21401PHONE # 410-222-7441EMAIL:[email protected]
North Cypress Branch Action Plan Summary
Waterway Restoration - $750,000 Stream Restoration - $1.25 million Channel BMP’s - $350,000 Watershed BMP’s – up to $530,000