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,

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Presentation transcript:

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

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

Looking desnagging an undercut tree. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK

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

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

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

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

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

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

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

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

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

“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

Install Live Siltation over top of the LPSTP

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

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

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

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

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

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

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

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

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

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

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

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

Looking LPSTP, Locked Logs, Bendway Weirs & veg. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK

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

FROM DOWNSTREAM LOOKING UPSTREAM AT THE THALWEG ALIGNMENT

Looking thalweg realigned by Bendway Weirs & Locked Logs CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK

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

Looking thalweg realigned by Bendway Weirs & Locked Logs CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK

From DS looking thalweg trace. CONSTRUCTION-DUCK CR. E. OF EASTERN AVE. PIX BY DERRICK

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.