Presentation on theme: "BANK EROSION PINS. BANK EROSION PINS A simple, inexpensive & accurate way to precisely measure bank erosion rates. Five foot long sections of ½ inch diameter."— Presentation transcript:
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.
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
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