2 BANK EROSION PINS A 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.
3 Phil Balch in KS installing bank pins The rebar is driven into the bank until the end is flush with the face of the bank.3
4 Bank Erosion Rate Measurement using 5 ft long rebar & stakes @ 5 ft intervals on top bank 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.Thalweg trace20 ft5 ft long rebarStakesMark 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
5 Pins were originally installed flush with streambank surface Bank erosion pinsBank erosion monitoring pins are pieces of rebar driven into the bank until the ends are flush with the streambank55
6 Stake was placed 25 ft from breaking edge of top bank one month ago Travelute Site, Little Blue River, KS.Stake was placed 25 ft from breaking edge of top bank one month ago21 ft of lateral migration in one month!On this site, the banks were 23 feet high. Two markers were set in the field; 1 – 29.1 feet from the bank, the other was set 28 feet from the edge. When checked in May; one pin was gone, the other was 7 feet from the edge.66
7 This PowerPoint presentation was developed & built by Dave Derrick This PowerPoint presentation was developed & built by Dave Derrick. Any questions or comments, call my personal , or Enjoy the information!!“Based on the interagency publication, Stream Corridor Restoration: Principles, Processes, and Practices, this introductory training covers:Stream corridor ecosystems and their componentsEcological processes, structure & functionsCharacterization and analysis of stream corridorsDevelopment of a restoration planDesign, implementation, monitoring, andIntegrated, iterative, adaptive, flexible approaches”.