bank erosion pins. bank erosion pins a simple, inexpensive & accurate way to precisely measure...
TRANSCRIPT
BANK EROSION
PINS
BANK EROSION PINSA simple, inexpensive & accurate way to precisely
measure bank erosion rates. Five foot long sections of ½ inch diameter rebar is driven horizontally into
the toe, middle, & upper sections of an eroding bank until the river end of the rebar is flush with
the face of the bank. Over time the length of rebar exposed shows the amount of erosion!! Wooden
stakes are usually labeled & driven at 5 ft intervals (5 stakes) on top bank above the rebar in case the
rebar is washed away.
Phil Balch in KS installing
bank pins
3
The rebar is driven into the bank until the
end is flush with the face of
the bank.
Thalweg trace
Bank Erosion Rate Measurement using
5 ft long rebar & stakes @ 5 ft
intervals on top bank
Mark stakes with distance from edge of bank (5 ft, 10 ft, 15 ft, etc.), then measure back from edge of bank & drive stakes into ground at 5 ft intervals
20 ft
5 ft long sections of ½ inch diameter rebar is driven into the toe, middle, & upper bank until the rebar is flush with the face of the bank.
5 ft long rebar
Stakes
5
Bank erosion pins
Pins were originally installed flush with streambank surface
6
21 ft of lateral migration in one month!
Travelute Site, Little Blue River, KS.
Stake was placed 25
ft from breaking edge of
top bank one month
ago
This PowerPoint presentation was developed & built by Dave Derrick.
Any questions or comments, call my personal cell @ 601-218-7717, or email @ [email protected]
Enjoy the information!!
CLEOPHUS SPEED ELVIS DERRICK, WITH FRIENDS