neosho river project specifications

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

Keyway for Bendway Weir doubling as a haul road.

CONSTRUCTION-NEOSHO RIVER @ GEFFERT’S- PIX BY PHIL BALCH 5/23/00

Placing key stone in the keyway.


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.


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

2 YEARS LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 9/2002

2 years later. Looking US @ Bendway Weirs & stable bank

2 YEARS LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 9/2002

2 years later. Looking US at Bendway Weirs & stable bank

3 YEARS LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 9/6/2003

3 years later. Looking US at stable bank

HIGH WATER – LET’S GET SOME

VELOCITIES(We have a sack of oranges

& time on our hands)

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

Looking US at weirs at low water on the Neosho River, KS. This is not when the velocity data was taken.



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

SINCE PROJECT CONSTRUCTION THE

RIVER HAS BEEN OUT OF BANK SEVERAL TIMES - IN JULY 2007 THE RIVER

EXPERIENCED THE 100 YEAR FLOOD

7 YEARS LATER-NEOSHO RIVER @ GEFFERT’S-PIX BY PHIL BALCH 11/9/2007

7 years later. Looking US. Note deposition between weirs.

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


8 years later. After a 100 year flood. Looking DS @ the Bendway Weirs


8 years later. After a 100 year flood. Looking DS @ lower end of the bend


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


After a 100 year flood. Looking DS. Large Woody Debris is indicative of slower velocities & good for aquatic habitat.

This PowerPoint presentation was developed & built by Dave Derrick.

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neosho river project specifications

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