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:msearing@mail.aacounty.org

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