Anne Arundel County s Severn River Watershed Implementation Strategy. Severn River Association

Transcription

1 Anne Arundel County s Severn River Watershed Implementation Strategy Severn River Association Watershed Protection and Restoration Program Anne Arundel County Department of Public Works August 18, 2014

2 Overall Subshed Priority for Restoration Low Priority For Restoration High Priority For Restoration Weighted Prioritization Indicators Landscape Indicators Developed Critical Area Ratio of Existing Wetlands to Potential Forested Stream Buffers Impervious Cover 10.1% 9.3% 6.7% 9.3% 5.2% Stream Ecology Habitat Assessment Biological Assessment 8.1% 8.1% 8.1% 6.4% 6.7% 5.6% 5.6% 4.4% 4.4% Runoff Peak Flow Q1 & Q2 Modeled Pollutant Loads Volume Runoff V1 & V2 TN, TP Based on EPA simple method for calculating pollutant loads. Inputs from annual precipitation, land cover EMCs and runoff coefficient as a function of impervious surfaces for determining pollutant load TMDL Impairments Septic Load 2.0 % BMP Treatment

3 Resource impairment is uniform and ubiquitous. } 72%

4 Anne Arundel County s Strategy Continue to Undertake Watershed Assessments for Each of the County s 12 Watersheds. Started nearly a decade ago. Will be completed in 2017 (Middle Patuxent) Have involved the expenditure of over $5.8 million. Use Assessments to Drive Prioritization for Restoration and Preservation. Stagger Restoration Based on Implementation Factors (e.g. Design Complexity, Permitting, Construction Funding). Use Monitoring to Drive Restoration Management Decisions.

5 Severn River WIP Restoration Scenario Map

6 Overall Severn River Watershed Tier 1 Core Strategy Pollutant Reductions through 2025 (Phase II WIP) Retrofit Type Quantity Units Treatment Area Impervious Treatment TN (lbs/yr) Pollutant Reduction TP (lbs/yr) TSS (Tons/yr) Severn Watershed Cost ($) Countywide Cost ($) Restoration of 1 st Order Streams Miles 7,722 1,079 12,519 2, ,036, ,423,860 Restoration of 2 nd Order and Higher Streams Miles 2, ,521 4,257 9,704 37,676, ,211,259 Pond Retrofits 84 Ponds 1, , ,166,029 82,614,351 Restoration Outfalls 334 Outfalls 3,789 1,060 9,434 1, ,285, ,532,519 Totals 15,200 2,935 36,354 8,755 10, ,164, ,781,989

7 Anne Arundel County Projects in Process Severn River Watershed Location Existing Facility Type Project Type Current Status Anticipated Construction Date Wells Branch Stream Stream Repair Negotiating a CO for design completion Fall, 2015 Schematic plan presentation to community Delllwood Court Outfall Relocation & Step Pools anticipated in September Winter, 2015 Dennington Lane Outfall SPSC Pursuing permits and right of way Nov, 2014 Buttonwood Trail Outfall SPSC Pursuing permits and right of way Feb, 2015 Olde Severna Park Outfall SPSC Construction to begin in September or October Dec, 2014 Cowhide Branch Stream Stream stabilization from Annapolis Mall to Medical Pkwy Pursuing SHA approval to advertise. (05/09/2014) Summer, 2015 Cowhide Branch Stream Stream stabilization from Medical Pkwy to Tidal Zone Oct, 2014 Severn Public Ponds Pond Wet Pond & SPSC at Outfall Pursuing permission from Central Services Oct, 2014 Various Locations (8 retrofits) 8 Dry Ponds Infiltration with pre-treatment cell Schematic design Wethersfield SWM Retrofit Dry Pond Wet Pools & Weir for Flow Control In Construction now - Complete mid-october Now Seven Oaks Regional BMP Multiple BMPs Feasibility Study for Retrofit Schematic design report Winter, 2014 Pasture Brook Road Ponds Constructed Wetland or Wet Pond Schematic design By North Tech HS Pond SPSC Schematic design Various Locations (6 retrofits) 6 Wet Ponds Wet Pond Report for MDE Need A/E assigned to OE Contract Spring, 2015 North Fork Bear Branch Pond & Stream Pond & Stream 2 SPSCs, Pond Decommission, Stream Restoration Will Short List Project when 2015 Money is Available Seven Oaks Regional BMP Multiple BMPs 4-5 Facilities determined by F.S. Not yet able to short list - waiting for FS results Kingsberry SWP in Saint Margarets Farm Dry Pond SPSC Schematic design due from A/E November, Valentine Creek SW Pond Retrofit- Crownsville along Old Hearld Harbor Road Dry Pond SPSC Completed Oct, 2014 Knollwood Drive Outfall Retrofit Project Outfall SPSC NTP for Construction by December, 2014 Spring, 2015 Severn Station Estates at Windswept Pond SPSC Completed June, 2014 Shipley's Choice Dam Rehabilitation Pond, Dam & Stream SPSC, Dam Decommission, Culvert, Stream Restoration Design at 95-percent, In permitting Nov, 2016

8 SE-OF-01 (FY15) SE-OF-02 (FY19+) * SE-OF-03 (FY19+) SE-OF-05 (FY19+) SE-PC-01 (FY14)

9 SE-PP-01 (FY15) SE-ST-01 (FY15) SE-ST-02 (FY15) SE-ST-03 (FY15)

10 Potential Additional Projects

11 Implementation Strategy B-Class Project Phasing Pond Retrofits Less design, permitting, right-of-way More immediate construction Design-Build Contracting Blanket-Order Construction Contracting Approximate project length: months.

12 Dry Pond Retrofit Shipley s Choice

13 Implementation Strategy B-Class Project Phasing Outfall Stabilization Moderate design, permitting, right-ofway Moderate construction phasing Design-Permit-Build Contracting Approximate project length: months.

14 Outfall Restoration Fair Oaks After Before

15 Sediment run off quickly clouds waterways cutting off sunlight critical to the Bay s ecosystems. 15

16 It also fills in tidal waters.

17 Implementation Strategy B-Class Project Phasing Stream Restoration Long lead time for design, permitting, right-of-way Out year construction phasing Design-Bid-Build Contracting Approximate project length: months.

18 Stream Restoration Cypress Creek After Before

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21 Questions? Erik Michelsen Watershed Protection Administrator Anne Arundel County, Department of Public Works Watershed Protection and Restoration Program