1. DEAD DIKES

2. DEAD DIKES USING DEAD POSTS IS A DAVE DERRICK DISCOVERY (DDD)

3. 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.

4. WALNUT BROOK, LOCATED IN MINE BROOK PARK, FLEMINGTON, NEW JERSEY FOUR ERODING BENDS WITH SEVERAL HEADCUTS PROJECT CONSTRUCTED JUNE 23 - June 26, 2009

5. 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

6. 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

7. CONSTRUCTION COMPLETE Photos by Dave Derrick SEPT. 20, 2009

8. 3 MONTHS OLD-Looking @ Dead Dike (DD) 3 MONTHS OLD-WALNUT BROOK, NJ. -PIX BY DERRICK 9-20-2009

9. 3 YEARS & 9 MONTHS AFTER PROJECT COMPLETION Photos by Dave Derrick MARCH 13, 2013

10. 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

11. 3 YRS 9 MONTHS LATER-Looking across @ deep posts (Dead Dike) designed to slow flow in secondary channels on floodplain

12. Little Blue River Hanover, KS. Clark Site Built July 2002

13. DEAD DIKES USING BRUSH FILLED TRENCHES IS A PHIL BALCH DISCOVERY (PBD)

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

15. 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. 16 Site # 18 – Clark 3/2003 - 8 months after construction- close-up of Dead Dike trench

17. 17 Site # 18 - Clark, 6/2006 - 4 years After Construction - well vegetated floodplain bench due to Dead Dikes (DD)

18. 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!! d_derrick@r2d-eng.com

19. Geaux Saints!!