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 @ d_derrick@r2d-eng.com

Enjoy the information!!

CLEOPHUS SPEED ELVIS DERRICK, WITH FRIENDS