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November 14, 2012

FORGE POND DAM Fish Passage Improvement Feasibility Study and Preliminary Design Jones River, Kingston, MA. November 14, 2012. Presented By Jill Winton. BACKGROUND. JONES RIVER BASIN. PROJECT GOALS. Document existing flow conditions and water supply management

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November 14, 2012

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  1. FORGE POND DAMFish Passage ImprovementFeasibility Study and Preliminary DesignJones River, Kingston, MA November 14, 2012 Presented By Jill Winton

  2. BACKGROUND

  3. JONES RIVER BASIN

  4. PROJECT GOALS • Document existing flow conditions and water supply management • Conduct new analyses to forecast the feasibility of providing fish passage at Forge Pond Dam under different scenarios of flow management and structural modifications

  5. FORGE POND

  6. SILVER LAKE NATURAL OUTLET

  7. Walkway atop 3 stoplog bays Forge Pond Spillway Access road atop 3 culvert openings FORGE POND DAM

  8. FORGE POND DAM

  9. LAKE STREET CULVERT & ACCESS ROAD

  10. FISHERY RESOURCES

  11. TARGET SPECIES – River Herring Blueback herring Alosa aestivalis Alewife Alosa pseudoharengus

  12. OTHER SPECIES American eel Anguilla rostrata Under review as a threatened species under ESA FRESHWATER MUSSELS Tidewater mucket Leptodeaochracea Eastern pondmusselLagumianasuta Species of Special Concern in MA

  13. HABITAT REQUIREMENTS Preliminary Summary of River Herring Habitat Assessment at Silver Lake (2008-09)

  14. PASSAGE REQUIREMENTS –Depth • Targets for herring: • ADULTS • 8-12 inches • MIN 6 inches • JUVENILES • 4-8 inches • MIN 2 inches

  15. PASSAGE REQUIREMENTS –Velocity Passage Success Rates for Alewife under Varying Velocities and Distances

  16. PASSAGE REQUIREMENTS –Flow Timing Timing of Important Life Cycle Events for Target Species

  17. WATER SUPPLY OPERATIONS

  18. SILVER LAKE WATER SUPPLY SYSTEM Summary of Brockton Water Supply Sources *Increases annually up to 4.07 mgd. Not included in totals. **110 of systemwide safe yield via a 1995 DEP ACO.

  19. 48.0 Period of Record: 1996 - 2012 47.5 47.0 When the Forge Pond water level exceeds the spillway crest, water is passed to Jones River. 46.5 46.0 Silver Lake Elev. (ft, NGVD 29) 45.5 When Silver Lake elevation drops below the natural outlet, it has been observed that water flows from Forge Pond into Silver Lake resulting from groundwater flow into Forge Pond. 45.0 44.5 Silver Lake Elev. (ft, NGVD 29) Forge Pond Dam Spillway Elev. (47.6 ft, NGVD 29) Silver Lake Berm Elev. (45.9 ft, NGVD 29) 44.0 Spawning adults immigrating 43.5 Juveniles rearing Juveniles emigrating 43.0 1 - Jan 1 - Feb 1 - Mar 1 - Apr 1 - May 1 - Jun 1 - Jul 1 - Aug 1 - Sep 1 - Oct 1 - Nov 1 - Dec SILVER LAKE LEVEL – Average

  20. SILVER LAKE LEVEL – 2011 with Diversions

  21. SILVER LAKE LEVEL – Duration Curves Fall Emigration Spring Immigration

  22. AQUARIA PLANT – Cost Analysis Overall Cost of Aquaria Water per Amount Purchased by Brockton (2012 example) Fixed Rate = $167,480 per 0.1 mgd (total annual cost of $5,861,800 for 2012 for 3.5 MGD) Variable Rate = $1.23 per 1,000 gallons used Excess Rate = $0.60 per 1,000 gallons used

  23. FISH PASSAGE ALATERNATIVES

  24. FISH LADDER – Alaska Steeppass

  25. FISH LADDER – Plan View

  26. FISH LADDER – Detail View

  27. NATURE-LIKE BYPASS CHANNEL

  28. NATURE-LIKE BYPASS CHANNEL Elevation Profile of Potential Bypass Channel

  29. DAM REMOVAL CONSIDERATIONS • Water Supply • Sediment • Infrastructure • Wetlands • Historical Resources • etc. Former Wapping Road Dam

  30. DAM REMOVAL – Modeling Approach

  31. NEXT STEPS • Required flows for each alternative • Feasibility of flow availability • Budgetary cost estimates • Selection of preferred alternative • Conceptual designs LATER PHASES • Detailed designs • Permitting • Implementation • Monitoring

  32. QUESTIONS?

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