dead dikes. dead dikes using dead posts is a dave derrick discovery (ddd)

DEAD DIKES

DEAD DIKES USING DEAD

POSTS IS A DAVE DERRICK

DISCOVERY (DDD)

DEAD DIKES: Dense rows of large driven dead posts, or trenches

filled with posts and/or brush, positioned perpendicular to high flow

on floodplain areas to reduce flow velocities, & possibly catch debris, &

induce sediment deposition.

WALNUT BROOK, LOCATED IN MINE BROOK

PARK, FLEMINGTON, NEW JERSEY

FOUR ERODING BENDS WITH SEVERAL HEADCUTS

PROJECT CONSTRUCTED JUNE 23 - June 26, 2009

CONSTRUCTION-Looking across @ Dead Dike (DD)posts designed to slow flow in a floodplain high-flow relief channel.

CONSTRUCTION-WALNUT BROOK, NJ. PIX BY DERRICK 6-23-2009

CONSTRUCTION-Looking US @ Dead Dike (DD) posts. Concern was that headcutting would occur in this high flow floodplain

channel during long-duration, high flow flood events. DD designed to reduce velocities to prevent headcutting.

CONSTRUCTION-WALNUT BROOK, NJ. PIX BY DERRICK 6-23-2009

CONSTRUCTION COMPLETE

Photos by Dave Derrick SEPT. 20, 2009

3 MONTHS OLD-Looking @ Dead Dike (DD)

3 MONTHS OLD-WALNUT BROOK, NJ. -PIX BY DERRICK 9-20-2009

3 YEARS & 9 MONTHS AFTER

PROJECT COMPLETION

Photos by Dave Derrick MARCH 13, 2013

3 YRS 9 MONTHS LATER-Looking across @ deep driven posts (Dead Dike) designed to slow flow in secondary channels

on floodplain. Still catching debris & still working!!

3 YRS 9 MONTHS LATER-WALNUT BROOK, NJ. PIX BY DERRICK 3-13-2013

3 YRS 9 MONTHS LATER-WALNUT BROOK, NJ. PIX BY DERRICK 3-13-2013

3 YRS 9 MONTHS LATER-Looking across @ deep posts (Dead Dike) designed to slow flow in secondary channels on floodplain

Little Blue River

Hanover, KS. Clark Site

Built July 2002

DEAD DIKES USING BRUSH

FILLED TRENCHES IS A PHIL BALCH DISCOVERY (PBD)

14Site # 18 – Clark - 7/2002-Removing debris that is choking channel.

15

Site # 18 – Clark - 3/2003, 8 months after construction-Trenches cut on floodway, then

backfilled with woody debris from river to slow flow, induce sediment deposition, & induce vegetative

growth to make this an ineffective flow area. River is three times as wide as it should be.

16

Site # 18 – Clark 3/2003 - 8 months after construction- close-up of Dead Dike trench

17

Site # 18 - Clark, 6/2006 - 4 years After Construction - well vegetated floodplain bench due to Dead Dikes (DD)

This PowerPoint presentation was developed & built by Dave Derrick.

Any questions or comments, call my personal cell @ 601-218-7717, or email @ d_derrick@r2d-eng.com

Enjoy the information!!

Geaux Saints!!