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Luxuries We Like To Have

Explore the benefits of using rock vanes and bendway weirs to manage river flows, prevent erosion, and promote streambank stabilization. Learn about their design, installation, and environmental impact.

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Luxuries We Like To Have

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  1. Luxuries We Like To Have • The “Luxury of Space” • The “Luxury of Time” (nature strengthens the project over time) • The “Luxury of Monitoring” • The “Luxury of Adaptive Management”

  2. UPSTREAM ANGLED ROCK VANES Looking downstream Phil Balch design, Little Blue River Elva Hynek property near Marysville, KS July 2003

  3. Site # 8 – E. Hynek Rock Vanes Rising Limb 40,000 cfs flood

  4. ROCK VANES WITH STONE TOE PROTECTION ON THE SALMON RIVER, PULASKI, NY. 2 YEARS OLDDESIGNED BY CARL SCHWARTZ, U.S. FISH & WILDLIFE SERVICE Photos by Dave Derrick APRIL 13, 2010

  5. Looking DS @ a properly functioning Rock Vane. Thalweg leaves the bank US of the US end of the RV. Note calm water in “elbow” of Rock Vane. Mini case study: 1 of 2 2 YEARS OLD - SALMON RIVER, PULASKI, NY - PIX BY DERRICK 4-13-2010

  6. Looking US @ calm water in “elbow” of Rock Vane. Note thalweg location. Mini case study: 2 of 2 2 YEARS OLD - SALMON RIVER, PULASKI, NY - PIX BY DERRICK 4-13-2010

  7. From: www.E-senss.com Deposition is brown, scour is blue Pool from John McCullah’s Salix Applied Earthcare Pool Typical upstream angled rock vane

  8. Differences between Rock Vanes & Bendway Weirs: here are Rock Vanes Mini case study: 1 of 4

  9. Here are some Bendway weirs, now let’s look at those rock vanes again Mini case study: 2 of 4

  10. LEVEL-CRESTED (flat) ANGLED-upstream 20 degrees from perpendicular (70 degrees from the bank) LENGTH-determined by how much river flow needs to be controlled & by future thalweg location HEIGHT- lower than any flow that can erode the bank, usually +/- 1 ft of the base flow (typical low-flow) water surface elevation SLOPED- Best at 10 to 1 ANGLED- 30 degrees from a line tangent to the bank LENGTH-determined by height at bank end, vane slope angle, and bathymetry at river end HEIGHT- varies by designer, anywhere from 1/3 bank full stage to bank full stage Differences between:BENDWAY WEIRSROCK VANES Mini case study: 3 of 4

  11. Rock Vanes (again) Mini case study: 4 of 4

  12. A system of Bendway Weirs, seen here in a physical movable-bed model, flow is left to right

  13. Looking DS at a partially drained movable-bed coal model of the Middle Mississippi River (Dogtooth Bend)

  14. 1. 2. UNREVETTED BEND REVETTED BEND Newly installed Bendway Weir Effects of Bendway Weirs 3. 4. From Rob Davinroy, St. Louis Corps

  15. Movable-bed Model

  16. Movable Bed Model

  17. How Do Bendway Weirs Work? • Water flowing over the weir is redirected at an angle perpendicular to the longitudinal axis of the weir. • With weirs angled upstream the erosive flow (energy) is directed away from the outer bank and toward the inner part of the bend. • Strong secondary currents (helical flow) in bend are broken up. • A set of weirs are designed to act as a system to capture, control, and redirect current directions and velocities through the bend and into the downstream crossing. • Last weir in system can aim flow (and channel thalweg) where you need it.

  18. BENDWAY WEIRS ON THE LITTLE BLUE RIVER, MARYSVILLE, KS

  19. The next 2 slides show the same Bendway Weirs Mini case study: 1 of 3 Bendway Weirs on the Little Blue River, working during flood, from Phil Balch of Wildhorse Riverworks, Inc

  20. Mini case study: 2 of 3 Deposition between Weirs from one bankfull flow 6/2002 on the Little Blue River, from Phil Balch of Wildhorse Riverworks, Inc

  21. Site # 5 Martin - Jueneman Mini case study: 3 of 3 Natural Vegetation established on deposition 9/02

  22. FISH COMMUNITY RESPONSE TO BENDWAY WEIR INSTALLATION ON THE LITTLE BLUE RIVER, KS.

  23. FISH COMMUNITY CHANGES AT TWO BENDWAY WEIR STREAMBANK STABILIZATION PROJECTS ON THE LITTLE BLUE RIVER, KS. Phil Balch Wildhorse Riverworks, Inc. 11821 NW 13th Street Topeka, Kansas 66615 785-213-3778 Mobile 785-478-4886 Office 26

  24. Pre-Bendway Weir 2001 John Hynek's site 1,150 feet long 20’ vertical banks Soil loss 1977 – 2000 = 12.7 acres (491,744 tons) Nitrates = 2,046 lbs Phosphorus = 18,686 lbs Potassium = 54,800 lbs 27

  25. SITE 1: Post-weir 2006 Post-Bendway Weir 2006 28 John Hynek's site

  26. Phil Balch builds Bendway Weirs a little taller & gets great wetlands between weirs. Little Blue River, Marysville, KS, high suspended-sediment sand bed river Pix by Derrick

  27. Rock vane Here a combination of Rock Vanes & Bendway Weirs were used to change the radius of the thalweg around a bend Thalweg Flow Bendway WEIRS Original bankline

  28. The way I like to build Bendway Weirs, note water surface disturbance

  29. BW - CHAPTER 14: CASE STUDY- NEOSHO RIVER, ALLEN COUNTY, (MIKE GEFFERT’S PROPERTY) SOUTHEAST KANSASConstructed May-July 2000Using Bendway Weirs for thalweg realignment & bank erosion reduction

  30. River is 260 ft wide • Gravel-sand bed • Project is 2,200 ft long, Outer bank is 25 ft tall, it eroded 178 ft laterally in 6 years time • 11 Bendway Weirs, are all 70 ft long, spaced 210 ft apart & constructed of “shot rock”, 400 lb max. • First set of velocities (March 15, 2001) water was 6 ft over the weirs, second set of velocities (Mar 16, 2001) water was a measured 12 ft over the top of the weirs!! • Velocities were measured with floating oranges Neosho River Project Specifications

  31. Pre-Project. Looking upstream at the near vertical eroded bank PRE-PROJECT-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 8/25/99

  32. Dozier pushing stone to form Bendway Weir #3. Note the thalweg is already being moved toward the center of the channel by the upstream weirs. CONSTRUCTION-NEOSHO RIVER @ GEFFERT’S- PIX BY PHIL BALCH 5/30/00

  33. HIGH WATER – LET’S GET SOME VELOCITIES(We have a sack of oranges & time on our hands)

  34. Neosho River, Allen County, Kansas 12 ft of water over weirs (measured) Top water velocities within the weir field never exceeded 3.00 ft/second 4.64 4.54 BW #3 2.63 4.97 4.07 2.92 6.08 Data collected March 15, 2001 6.47 BW #7 2.88 Mini case study: 3 of 3 BW #11

  35. CATTARAUGUS CREEK @ SAVAGE ROAD – CONSTRUCTED OCT 2004

  36. Looking DS in project bend, high water on Catt Creek, 11/4/2004 8.0 ft/sec Slow water on the outside of the bend?? Thalweg 6.4 ft/sec Within the weir field 2.6 ft/sec Mini case study: 8 of 12

  37. SAME FLOW AS PREVIOUS BENDWAY WEIR PIX. Looking US at Rock Vane #2, high water, Catt Creek at Savage Rd. 11/4/2004, Rock Vane backs up water in the bend.

  38. Rock Vane #2 dissipating energy, but consider the super-elevation of water upstream of the vane. 3/28/2006-Pix by Mayer

  39. CHAUTAUQUA CREEK ICE DAMAGE REDUCTION PROJECT –Near its mouth @ Lake Erie • Severe scour from ice and high flow velocities on the right descending bank had resulted in an overwidened section of stream. • Mid-channel sediment bars, mouth of creek @ Lake Erie clogged • No holding areas or habitat for steelhead • A heavily used public fishing section of the stream

  40. Single Stone Bendway Weirs NEED PLANS & SPECS Trench Stone & Stacked Stone Wall Key Sloped Stone using “Big Flats” Key Flow Key Key Key Key Key

  41. DRILLING & PEGGING TOE STONES & SINGLE STONE BENDWAY WEIRS WITH METAL RODS TO BEDROCK

  42. Dave Spann of Chautauqua County Soil & Water Conservation District with a 7.5 ft long, 2.5 inch diameter bar. Dave did everything from writing the grant to providing extraordinary project management. On time and under budget!!!! Pix by Joe Galati

  43. Construction June 2006. Drilling solid stone Pix by Joe Galati

  44. Construction June 2006. Looking US. Metal pinning rods not cut off yet. Pix by derrick

  45. Looking upstream at the SINGLE-STONE BENDWAY WEIRS

  46. Aug 31, 2006, looking US at two pegged to bedrock Single-Stone Bendway Weirs in the stacked stone wall section. Pix by derrick

  47. A high water flow event. Mar 14, 2007

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