1. GRADE CONTROL: the VIFFLE {Combo of the cross- Vane & rocked rIFFLE}

2. THIS METHOD IS A DAVE DERRICK & JOHN MCCULLAH DISCOVERY {hatched late at night in the Seattle airport while headed to Alaska}

3. THE VIFFLE: Combining the best attributes of both the Cross-Vane (hydraulically braking {slowing} current near both banks) & the Engineered Rocked Riffle (riffle dissipating energy, improving fish passage, & moving the deep scour hole from underneath the structure to a position downstream of the ERR).

4. THE VIFFLE Combination of a Cross- Vane & Rocked Riffle Onondaga Creek, Site 5-D, Lafayette, NY Mini case study: 2 of 4

5. Step #1: Build the two Rock Vanes (arms) & center connector of the Cross-Vane & key the CV deeply into both banks with robust vegetated keys.

6. Looking US at the rock Cross-Vane section of a Viffle, rocked riffle not constructed yet. Onondaga Creek, Site 5-D, Aug 2006. Photo by Mark Schaub, OCSWCD Mini case study: 2 of 4

7. Step #2: Starting downstream, dig into the bed across the channel between the two keys & start placing stones in compression underground & building upstream with rows of stones placed in compression until this ERR is blended into the Cross-Vane structure.

8. Onondaga Creek, Site 5-D, Looking across & US at the completed VIFFLE (Vane rIFFLE), Rocked riffle section choked with creek cobble-gravel. Photo by Mark Schaub, OCSWCD Mini case study: 3 of 4

9. Looking DS @ a great looking Viffle from John McCullah Note bank protection

10. It’s over!!!! THE JOHN & DAVE SHOW THANKS YOU FOR YOUR ATTENTION !!

11. 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

12. Pix Derrick Aug xx, 2013Mini case study: 4 of 4 7 YEARS LATER-Looking US at the Viffle. In excellent shape & functioning