Bunker Pond DamDam Removal and Stream Restoration<br />Zach Boulter				Andrew Smart<br />Jake Pouliot				Craig Langton<br ...
Introduction<br /><ul><li>Location
Background
History
Rehabilitation
Removal
Natural Resources
Sediment
Hydrology
Stream Restoration
Deconstruction
Costing
Scheduling</li></ul>2<br />
http://www.lampreyriver.org/<br />3<br />
Background<br />Constructed in 1865<br />The dam is currently owned and operated by the NHDES since 1959<br />It is consid...
Background<br />15’ high<br />76.8 sq. mi. of drainage area<br />Originally installed for hydropower for local mills<br />...
History<br />1746 - Joshua Folsom opens mill on the east side of the Lamprey.<br />The pond is named after David Bunker, w...
Original Scope<br />Rehabilitation<br />Sidewall cracking<br />Sidewall expansion<br />Seepage<br />Groundwater flow<br />...
Removal<br />Dam no longer serves a purpose<br />Contributes to upstream flooding<br />More economic than rehabilitation<b...
Funding<br />Repair<br />Annual Cost to Operate: $3,800/yr.<br />Average Dam Restoration Cost: $800,000<br />Little to no ...
Natural Resources<br />Lamprey River as the most significant coastal river for anadromous fish.<br />Lamprey is a National...
Restoration Potential for Anadromous Fish<br />www.nh.des.gov<br />11<br />
Spawning Habitat<br />Reservoir<br />- Decreased Water Quality (decreased circulation)<br />- Pollutants Accumulate (conce...
Sediment Testing<br /><ul><li>≈20 total samples
Samples taken at 5’ intervals closest to dam
10’ intervals farther away
Approx. 5250 ft3of sediment.</li></ul>13<br />
Can These Sediments Be Released?<br />Contaminants can attach to sediments and pose a threat to downstream wildlife.<br />...
  Gradually drawing down the dam,</li></ul>14<br />
Hydrology<br />Hec-Ras (Hydraulic Engineering Centers River Analysis System)<br />Bridge upstream is still concern for flo...
HEC-RAS<br />http://www.lampreyriver.org/<br />16<br />
Cross-Sections<br />17<br />
3-D Cross-Sections<br />Bunker Pond Dam 2-GEL       Plan: Plan 02    4/18/2010 <br />Legend<br />WS 100 yr<br />Ground<br ...
Bridge Pre-Removal<br />Bunker Pond Dam 2-GEL       Plan: Plan 02    4/18/2010 <br />  Route 27 Bridge<br />.1<br />.045<b...
Mothers Day Flood 2006<br />Route 27 Bridge, NH-DES <br /><ul><li>4,200 cfs 100 year flood calculated by Log Person III me...
4,930 cfs 100 year flood used in HEC-RAS modeling
Approximate 80 year Flood 3,800 cfs
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Dam Removal and Stream Restoration

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  • Located in Epping NH where the lamprey river crosses under route 27
  • April 16 – 18, 2007 - Lamprey River nr. Newmarket – 8450 cfs &gt; 100 year storm event. May 14 – 17, 2006 - Lamprey River nr. Newmarket – 9100 cfs &gt; 100 year storm event.
  • Q100 at dam – 4930 cfsDischarge capacity at dam = 4820 cfs 1’ frbrd, 5936 cfs top of damIncluded in the 76.8 is at least 30 registered dams
  • NH Fish and Game CommissionWiswall Dam in Durham is having a fish passage put inNational wild and scenic rivers are not usually damned
  • Current accessible anadromous fish habitat in coastal rivers vs. potential habitat in the Lamprey River (in miles).
  • Dam Removal and Stream Restoration

    1. 1. Bunker Pond DamDam Removal and Stream Restoration<br />Zach Boulter Andrew Smart<br />Jake Pouliot Craig Langton<br /> Ben Inman Bill Boornazian<br /> Kyle Janco<br />1<br />
    2. 2. Introduction<br /><ul><li>Location
    3. 3. Background
    4. 4. History
    5. 5. Rehabilitation
    6. 6. Removal
    7. 7. Natural Resources
    8. 8. Sediment
    9. 9. Hydrology
    10. 10. Stream Restoration
    11. 11. Deconstruction
    12. 12. Costing
    13. 13. Scheduling</li></ul>2<br />
    14. 14. http://www.lampreyriver.org/<br />3<br />
    15. 15. Background<br />Constructed in 1865<br />The dam is currently owned and operated by the NHDES since 1959<br />It is considered a low hazard structure by the NHDES<br />Prone to flooding<br />NHDES<br />Upstream of Bunker Pond Dam<br />4<br />
    16. 16. Background<br />15’ high<br />76.8 sq. mi. of drainage area<br />Originally installed for hydropower for local mills<br />5<br />
    17. 17. History<br />1746 - Joshua Folsom opens mill on the east side of the Lamprey.<br />The pond is named after David Bunker, who owned a woolen mill.<br />Historical assessment is an important part of permitting in order to identify the significance of potential historical resources.<br />Permits can be deferred if the site contains valuable historical resources. <br />Courtesy of Madelyn Williamson – Epping Historical Society<br />6<br />
    18. 18. Original Scope<br />Rehabilitation<br />Sidewall cracking<br />Sidewall expansion<br />Seepage<br />Groundwater flow<br />Bank erosion<br />Flood control<br />West side of Bunker Pond Dam<br />7<br />
    19. 19. Removal<br />Dam no longer serves a purpose<br />Contributes to upstream flooding<br />More economic than rehabilitation<br />Natural resources<br />Marine life<br />Plant life<br />Water quality<br />Downstream of Bunker Pond Dam<br />8<br />
    20. 20. Funding<br />Repair<br />Annual Cost to Operate: $3,800/yr.<br />Average Dam Restoration Cost: $800,000<br />Little to no Funding Provided for Repair<br />Removal<br />Estimated Removal Cost: $180,000<br />More Funding Provided Because of Effect on Ecology<br />9<br />
    21. 21. Natural Resources<br />Lamprey River as the most significant coastal river for anadromous fish.<br />Lamprey is a National Wild & Scenic River <br />NH Fish and Game Commission<br />10<br />
    22. 22. Restoration Potential for Anadromous Fish<br />www.nh.des.gov<br />11<br />
    23. 23. Spawning Habitat<br />Reservoir<br />- Decreased Water Quality (decreased circulation)<br />- Pollutants Accumulate (concentrate) <br />- Oxygen Depletion (may become anoxic) <br />- Reservoir Stratifies(loss of turbulent flow) <br />Downstream<br />- Water Quality is Reduced <br />- Altered Flow Regime <br />- Traps Sediment <br />- Traps Debris <br />- Blocks Nutrient Transport <br />- Algae Blooms<br />- Temperatures modified<br />- Sediment Starved <br />- Riverbed Degrades<br />- Increased Temperatures<br />- Blocks Fish Passage<br />Increased <br />Evaporation<br />- Nutrient Starved<br />Debris Jam<br />epilimnion<br />metalimnion<br />hypolimnion<br />Habitat/Substrate<br />Buried by Sediment<br />Original Bed Profile<br />Free Flowing River<br />at Dynamic Equilibrium<br />Dam<br />Courtesy of Laura Wildman – American Rivers<br />12<br />
    24. 24. Sediment Testing<br /><ul><li>≈20 total samples
    25. 25. Samples taken at 5’ intervals closest to dam
    26. 26. 10’ intervals farther away
    27. 27. Approx. 5250 ft3of sediment.</li></ul>13<br />
    28. 28. Can These Sediments Be Released?<br />Contaminants can attach to sediments and pose a threat to downstream wildlife.<br />If contaminated, Bunker Pond will need to be dredged.<br />Other ways to limit impact of stored sediments are:<br /><ul><li> Removing the dam before Spring runoff,
    29. 29. Gradually drawing down the dam,</li></ul>14<br />
    30. 30. Hydrology<br />Hec-Ras (Hydraulic Engineering Centers River Analysis System)<br />Bridge upstream is still concern for flooding<br />15<br />
    31. 31. HEC-RAS<br />http://www.lampreyriver.org/<br />16<br />
    32. 32. Cross-Sections<br />17<br />
    33. 33. 3-D Cross-Sections<br />Bunker Pond Dam 2-GEL Plan: Plan 02 4/18/2010 <br />Legend<br />WS 100 yr<br />Ground<br />10 <br />Bank Sta<br />9.95 <br />9.6 <br />9.8 <br />9.9 <br />9.5 <br />9.4 <br />9.3 <br />Figure : 3-D Cross-Section<br />18<br />
    34. 34. Bridge Pre-Removal<br />Bunker Pond Dam 2-GEL Plan: Plan 02 4/18/2010 <br /> Route 27 Bridge<br />.1<br />.045<br />.1<br />155<br />Legend<br />150<br />EG 100 yr<br />WS 100 yr<br />145<br />Elevation (ft)<br />Crit 100 yr<br />140<br />Ground<br />135<br />Bank Sta<br />130<br />125<br />0<br />200<br />400<br />600<br />800<br />1000<br />1200<br />1400<br />Station (ft)<br />Figure : Route 27 with Bunker Pond Dam<br />19<br />
    35. 35. Mothers Day Flood 2006<br />Route 27 Bridge, NH-DES <br /><ul><li>4,200 cfs 100 year flood calculated by Log Person III method
    36. 36. 4,930 cfs 100 year flood used in HEC-RAS modeling
    37. 37. Approximate 80 year Flood 3,800 cfs
    38. 38. New Market Stream Gauge used peak flow of 8,970 cfs</li></ul>20<br />
    39. 39. Bridge Post-Removal<br />Bunker Pond Dam 2-GEL Plan: Plan 04 4/18/2010 <br /> Route 27 Bridge<br />.1<br />.045<br />.1<br />155<br />Legend<br />150<br />EG 100 yr<br />WS 100 yr<br />145<br />Elevation (ft)<br />Crit 100 yr<br />140<br />Ground<br />135<br />Bank Sta<br />130<br />125<br />0<br />200<br />400<br />600<br />800<br />1000<br />1200<br />1400<br />Station (ft)<br />21<br />
    40. 40. Proposed Stream Restoration <br />Geomorphic Stream <br />Rock Structures to reduce bank erosion<br />Planting of wild flowers and slope seeding <br />Monitoring will be required in the months post removal<br />The Cross-Vane, W-Weir, and K-Hook Vane by David Rosgen<br />22<br />
    41. 41. Proposed Stream Restoration <br />The Cross-Vane is a grade control structure that decreases near-bank shear stress, velocity and stream power.<br />Structures locations will be determined post removal<br />Possible locations<br />Before Route 27 Bridge channel<br />River bends within Bunker Pond<br />23<br />
    42. 42. Proposed Stream Restoration <br />Approximately 50 cubic yards of rip rap removed from the dam site<br />Can be used to create cross- vanes<br />24<br />
    43. 43. Predicted Planting Area<br />25<br />
    44. 44. Deconstruction Plan<br />Dewatering<br />Draining via flood gate<br />Bedrock at approx. 4’<br />Portadam will be put in place<br />Any water remaining will be pumped out<br />From Portadam brochure<br />26<br />
    45. 45. Deconstruction Plan<br />Removal of Concrete<br />Removal will begin at the east abutment and progress to the west abutment<br />Approx. 270 tons of concrete<br />Concrete will be recycled for $35/ton at ERRCO in Epping, NH<br />27<br />
    46. 46. Deconstruction Plan<br />Post-Removal<br />Rip-rap removal<br />Seeding and jute mats on banks<br />Portadam will be removed and reinstalled to divert water back to original stream flow<br />http://www.gregsindigenouslandscapes.com.au/images/JuteMat.JPG<br />28<br />
    47. 47. Deconstruction Plan<br />29<br />
    48. 48. Winnicut Dam: October 2009<br />http://www.earthcam.com/winnicut/<br />30<br />
    49. 49. Winnicut Dam: October 2009<br />http://www.earthcam.com/winnicut/<br />31<br />
    50. 50. Winnicut Dam: November 2009<br />http://www.earthcam.com/winnicut/<br />32<br />
    51. 51. Winnicut Dam: March 2010<br />http://www.earthcam.com/winnicut/<br />33<br />
    52. 52. Cost Breakdown<br />34<br />
    53. 53. Scheduling<br />35<br />
    54. 54. Advisors<br />Grace Levergood (NHDES)<br />Dr. Thomas Ballestero<br />Dr. Kevin Gardner<br />Dr. David Gress<br />Dr. Pedro de Alba<br />36<br />
    55. 55. THANK YOU<br />QUESTIONS?<br />37<br />

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