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Looking DS @ desnagging an undercut tree.

DUCK CREEK EAST OF EASTERN AVENUE DAMAGED BY THE BIG RAIN ON JUNE 12, 2008 (7 inches in an hour, Q-75 year flow) PROJECT CONSTRUCTED BY CITY OF DAVINPORT, IOWA JUNE 30-July 2, 2008.

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Looking DS @ desnagging an undercut tree.

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  1. DUCK CREEK EAST OF EASTERN AVENUEDAMAGED BY THE BIG RAIN ON JUNE 12, 2008(7 inches in an hour, Q-75 year flow)PROJECT CONSTRUCTED BY CITY OF DAVINPORT, IOWA JUNE 30-July 2, 2008

  2. LOCKED LOGS20-30 ft long, 8-20 inches in diameter, maple tree, some limbs trimmed, angled downstream 30 to 45 degrees {relative to the bank}

  3. Looking DS @ desnagging an undercut tree. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  4. Looking DS. We will cut up & use this tree for Locked Logs CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  5. Sawing Locked Logs from the tree just removed from the stream CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  6. Sawing large Locked Logs from the mother tree CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  7. Place appropriate sized Locked Logs on bed of stream. They should be angled downstream anywhere from 30 to 70 degrees (relative to the bank)

  8. Looking DS. Typical Locked Log. Will provide hydraulic roughness & good aquatic habitat for the stream. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  9. LOCKED LOG locked under LPSTP. Locked Log provides hydraulic roughness & aquatic habitat Install part of the Longitudinal Peaked Stone Toe Protection (LPSTP) with side slopes at the angle of repose

  10. Looking US. Placing more stone on Locked Log. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  11. Looking US. Building LPSTP over the Locked Log. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  12. Looking DS. Placing another Locked Log. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  13. “Slit” Live Siltation for situations where the LPSTP is close to the toe of the bank & it is difficult to get the butt ends of the willow down into the Vadose (moist) zone

  14. Install Live Siltation over top of the LPSTP

  15. Looking US. Bucket digging in @ toe. Derrick readies willow for planting. Mini case study: 1 of 13 CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  16. Looking US. Willow poles placed in narrow slit after hoe bucket was lifted up a few inches. Mini case study: 2 of 13 CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  17. Slope bank to a stable angle (balanced cut/fill) CUT FILL

  18. Looking US @ hoe sloping bank & soil-choking LPSTP Mini case study: 7 of 13 CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 6-30-08

  19. Looking US. Close-up of Slit Live Siltation & LPSTP Mini case study: 10 of 13 CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-2-2008

  20. Looking US @ another section of soil-choked LPSTP Mini case study: 11 of 13 CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-2-2008

  21. AERIAL VIEW OF LPSTP WITH LIVE SILTATION, SOIL CHOKE, LOCKED LOGS, BENDWAY WEIRS, & A PLANTED BANK Flow

  22. MORNING OF JULY 2, 2008 2 DAYS AFTER WE STARTED, PROJECT DURN NEAR COMPLETE

  23. Looking US. Bank to be planted with rooted-stock plants in Sept 08 CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-2-2008

  24. Looking DS. 6 ducks hiding in the Locked Logs. See them? CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-1-2008

  25. 6 Ducks hiding in the Locked Logs. See them? CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-1-2008

  26. 6 Ducks in the Locked Log Duck Hiding Structure CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-1-2008

  27. Looking US @ LPSTP, Locked Logs, Bendway Weirs & veg. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-2-2008

  28. Looking DS. DS bend protection will be built July 7-11, 08 CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-2-2008

  29. FROM DOWNSTREAM LOOKING UPSTREAM AT THE THALWEG ALIGNMENT

  30. Looking US @ thalweg realigned by Bendway Weirs & Locked Logs CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-1-2008

  31. Same pix as previous, but with thalwegs delineated. Old thalweg alignment new thalweg alignment CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-1-2008

  32. Looking US @ thalweg realigned by Bendway Weirs & Locked Logs CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-1-2008

  33. From DS looking US @ thalweg trace. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK 7-1-2008

  34. Bank Protection redundancy: Fully functioning both hydraulically & environmentally. Multiple protection redundancy. LPSTP provides a robust, adjustable, direct armor bank toe protection. Bendway Weirs move scour & thalweg away from attacked bank, with velocities reduced within weir field. Locked Logs & vegetation roughness reduces near-bank velocities. Roots strengthen bank & bind soil. Upper bank and riparian top bank plantings provide stability and a continuous riparian corridor.

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