luxuries we like to have the “luxury of space” the “luxury of time” (nature strengthens the...
TRANSCRIPT
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”
UPSTREAM ANGLED ROCK VANES
Phil Balch design, Little Blue River Elva Hynek property near Marysville, KS July 2003
Looking downstream
Rising Limb 40,000 cfs flood
Rock VanesSite # 8 – E. Hynek
ROCK VANES WITH STONE TOE PROTECTION ON THE
SALMON RIVER, PULASKI, NY. 2 YEARS OLD
DESIGNED BY CARL SCHWARTZ, U.S. FISH &
WILDLIFE SERVICE Photos by Dave Derrick
APRIL 13, 2010
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.
2 YEARS OLD - SALMON RIVER, PULASKI, NY - PIX BY DERRICK 4-13-2010
Mini case study: 1 of 2
Looking US @ calm water in “elbow” of Rock Vane. Note thalweg location.
2 YEARS OLD - SALMON RIVER, PULASKI, NY - PIX BY DERRICK 4-13-2010
Mini case study: 2 of 2
Typical upstream angled rock vane
From:
www.E-senss.com
from John McCullah’s
Salix Applied Earthcare
Pool
Pool Deposition is
brown, scour is
blue
Differences between Rock Vanes & Bendway Weirs: here are Rock Vanes
Mini case study: 1 of 4
Here are some Bendway weirs, now let’s look at those rock vanes again
Mini case study: 2 of 4
Differences between:BENDWAY WEIRS ROCK VANES• 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
Mini case study: 3 of 4
Rock Vanes (again)
Mini case study: 4 of 4
A system of Bendway Weirs, seen here in a physical movable-bed model, flow is
left to right
Looking DS at a partially drained
movable-bed coal model of
the Middle Mississippi
River (Dogtooth Bend)
UNREVETTED BEND REVETTED BEND
Newly installed Bendway Weir Effects of Bendway Weirs
1.
3. 4.
2.
From Rob Davinroy, St. Louis Corps
Movable-bed Model
Movable Bed Model
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.
BENDWAY WEIRS ON THE LITTLE
BLUE RIVER, MARYSVILLE,
KS
Bendway Weirs on the Little Blue River, working during flood,
from Phil Balch of Wildhorse Riverworks, Inc
The next 2 slides show the same Bendway
Weirs
Mini case study: 1 of 3
Deposition between Weirs from one bankfull flow 6/2002 on the Little Blue River, from Phil Balch of Wildhorse
Riverworks, Inc
Mini case study: 2 of 3
Natural Vegetation established on deposition 9/02
Site # 5 Martin - JuenemanMini case study: 3 of 3
FISH COMMUNITY RESPONSE TO
BENDWAY WEIR INSTALLATION ON THE LITTLE BLUE
RIVER, KS.
26
Phil BalchWildhorse Riverworks, Inc.
11821 NW 13th StreetTopeka, Kansas 66615
785-213-3778 Mobile785-478-4886 Office
FISH COMMUNITY CHANGES AT TWO BENDWAY WEIR FISH COMMUNITY CHANGES AT TWO BENDWAY WEIR STREAMBANK STABILIZATION PROJECTS ON THE LITTLE STREAMBANK STABILIZATION PROJECTS ON THE LITTLE
BLUE RIVER, KS BLUE RIVER, KS..
27
Pre-Bendway Weir 2001
SPECIES Number CPUE
Longnose gar 4 5.71
River carpsucker 1 1.43
Channel catfish 6 8.57
Common carp 4 5.71
Red shiner 22 31.43
Gizzard shad 1 1.43
Freshwater drum 1 1.43
7 Species, 39 Individuals
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
John Hynek's site
28
SITE 1: Post-weir 2006
SPECIES Number CPUE
Longnose gar 1 1.1
River carpsucker 54 60.0
Channel catfish 39 43.3
Common carp 14 15.6
Red shiner 533 592.2
Gizzard shad 342 380.0
Flathead catfish 7 7.8
Smallmouth buffalo 1 1.1
Suckermouth minnow 33 36.7
Bluntnose minnow 10 11.1
Emerald shiner 22 24.4
Sand shiner 208 231.1
Bullhead minnow 149 165.6
Mosquitofish 6 6.7
Orangespotted sunfish 4 4.4
Green sunfish 3 3.3
Freshwater drum 7 7.8
17 Species, 1,433 Individuals
Post-Bendway Weir 2006
John Hynek's site
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
Here a combination of Rock Vanes & Bendway
Weirs were used to change the radius of the thalweg around a bend
Original bankline
Thalweg
Bendway WEIRS
Rock vane
Flow
The way I like to build Bendway Weirs, note water surface
disturbance
BW - CHAPTER 14: CASE STUDY- NEOSHO RIVER,
ALLEN COUNTY, (MIKE GEFFERT’S PROPERTY)
SOUTHEAST KANSASConstructed May-July 2000 Using Bendway Weirs for thalweg
realignment & bank erosion reduction
Neosho River Project Specifications• 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
Pre-Project. Looking upstream at the near vertical eroded bank
PRE-PROJECT-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 8/25/99
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
HIGH WATER – LET’S GET SOME
VELOCITIES(We have a sack of oranges
& time on our hands)
Mini case study: 3 of 3
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
BW #7
BW #3
BW #11
2.886.47
6.08
2.924.074.97
2.634.544.64
Data collected March 15, 2001
CATTARAUGUS CREEK @
SAVAGE ROAD – CONSTRUCTED
OCT 2004
Within the weir
field 2.6 ft/sec
Thalweg 6.4 ft/sec
8.0 ft/sec
Looking DS in project bend, high water on Catt Creek, 11/4/2004
Slow water on the outside of the bend??Mini case study: 8 of 12
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.
Rock Vane #2 dissipating energy, but consider the super-elevation of water upstream of the vane. 3/28/2006-Pix by Mayer
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
NEED PLANS & SPECS
Single Stone Bendway Weirs
Key
Key
Key
Key
Key
Key
Key
Trench Stone & Stacked Stone Wall
Sloped Stone using “Big Flats”
Flow
DRILLING & PEGGING TOE STONES & SINGLE STONE
BENDWAY WEIRS WITH METAL RODS TO
BEDROCK
Pix by Joe Galati
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!!!!
Construction June 2006.
Drilling solid stone
Pix by Joe Galati
Construction June 2006.
Looking US. Metal pinning
rods not cut off yet.
Pix by derrick
Looking upstream at the
SINGLE-STONE BENDWAY WEIRS
Aug 31, 2006, looking US at two pegged to bedrock Single-Stone Bendway Weirs in the
stacked stone wall section.
Pix by derrick
A high water flow event. Mar 14, 2007
Mar 14, 2006. Looking DS. Note
slow water near right bank due to Single
Stone Bendway Weirs
Pix by Joe Galati
Mar 14, 2006. Looking DS. Three submerged Bendway Weirs can be located due to
surface disturbance
Pix by Joe Galati
Mar 14, 2006. Looking DS. Close-up of two submerged Bendway Weirs
Pix by Joe Galati
16 MONTHS AFTER CONSTRUCTION
NOV 2007
Nov 8, 2007. Looking DS.
Thalweg off the ends of the
Bendway Weirs
Pix by Joe Galati
COMBINATIONS OF REDIRECTIVE
& RESISTIVE TECHNIQUES
Sulphur Creek @ Dunnigan Burn Dump
Yolo County, CA
THE PLAN !!
Footprint of the Dunnigan burn dump
LPSTPBENDWAY WEIR
KEY
Thalweg Management Pre & Post-Project Conditions
THALWEG-Post ProjectTHALWEG-Pre-Project
The Bendway Weirs are designed to reduce velocities near the LPSTP, & move the thalweg to a location off the ends of the Bendway Weirs.
Weirs also provide protection redundancy.
Mini case study: 2 of 10
Pix by John McCullah - October 1998
DURING CONSTRUCTION-Looking DS @ LPSTP & 1 Bendway Weir
Mini case study: 3 of 10
Pix by John McCullah-Jan 1999
3 months later-Looking DS @ tall cliff area. The weirs were not overtopped the first winter.
Mini case study: 4 of 10
Pix by John McCullah - Jan 17, 2001
2+ Years-Looking DS @ the project bend, deposition in weir field.
Mini case study: 6 of 10
Sulphur Creek @ Dunnigan Burn Dump-Pix by McCullah-Feb 14, 2008
9+ Years Later-Looking DS @ completely filled in Bendway Weir field results in a wide buffer of protection for the burn dump.
Mini case study: 10 of 10
Does your mind look like this?
GOOD, my work is done.
QUESTIONS???