bw - chapter 14: case study- neosho river, allen county, (mike geffert’s property) southeast...
TRANSCRIPT
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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
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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
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Pre-Project. Looking upstream at the near vertical eroded bank
PRE-PROJECT-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 8/25/99
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Keyway for Bendway Weir doubling as a haul road.
CONSTRUCTION-NEOSHO RIVER @ GEFFERT’S- PIX BY PHIL BALCH 5/23/00
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Placing key stone in the keyway.
CONSTRUCTION-NEOSHO RIVER @ GEFFERT’S- PIX BY PHIL BALCH 5/23/00
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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
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1 YEAR LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 5/01
1 year later. Looking DS at the Neosho River on the flood
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2 YEARS LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 9/2002
2 years later. Looking US @ Bendway Weirs & stable bank
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2 YEARS LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 9/2002
2 years later. Looking US at Bendway Weirs & stable bank
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3 YEARS LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 9/6/2003
3 years later. Looking US at stable bank
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HIGH WATER – LET’S GET SOME
VELOCITIES(We have a sack of oranges
& time on our hands)
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Mini case study: 1 of 3
Neosho River, Allen County, Kansas 6 ft of
water over weirs (estimated) Top water velocities within the weir field never exceeded
1.00 ft/second
BW #7
BW #3
BW #11
1.61
0.602.041.03
0.332.792.72
Data collected March 15, 2001
The Thalweg left the bank a measured 200
ft US of BW#1
The Thalweg hit the bank a measured
150 ft DS of BW#11
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Looking US at weirs at low water on the Neosho River, KS. This is not when the velocity data was taken.
Mini case study: 2 of 3
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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
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SINCE PROJECT CONSTRUCTION THE
RIVER HAS BEEN OUT OF BANK SEVERAL TIMES - IN JULY 2007 THE RIVER
EXPERIENCED THE 100 YEAR FLOOD
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7 YEARS LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 11/9/2007
7 years later. Looking US. Note deposition between weirs.
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AFTER A 100 YEAR FLOOD-NEOSHO RIVER - PIX BY DERRICK 12/11/2008
8 years later. After a 100 year flood. Looking US @ the Bendway Weirs & snow
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AFTER A 100 YEAR FLOOD-NEOSHO RIVER - PIX BY DERRICK 12/11/2008
8 years later. After a 100 year flood. Looking DS @ the Bendway Weirs
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AFTER A 100 YEAR FLOOD-NEOSHO RIVER - PIX BY DERRICK 12/11/2008
8 years later. After a 100 year flood. Looking DS @ lower end of the bend
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AFTER A 100 YEAR FLOOD-NEOSHO RIVER - PIX BY DERRICK 12/11/2008
8 years later. After THE 100 YEAR FLOOD. Looking DS. Erosion has laid the bank back to a stable angle. Note how flat the bank is at the toe
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AFTER A 100 YEAR FLOOD-NEOSHO RIVER - PIX BY DERRICK 12/11/2008
After a 100 year flood. Looking DS. Large Woody Debris is indicative of slower velocities & good for aquatic habitat.
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This PowerPoint presentation was developed & built by Dave Derrick.
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