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| A boulder weir is a basic grade control structure that acts
like a beaver dam to slow water behind it and creates a "riffle"
that water spills over. |
Boulder Weir Specifications:
- Each crest stone is a 2'x3'x4' block of poured
concrete.
- There are crushed rock aprons on either side
of crest stones: upstream side at a 4:1 slope, downstream side
at a 20:1 slope.
- 50% of crushed rock used for the aprons is
class E or greater than 90 lbs per rock.
- each wier required approximately 8-10 crest
stones and 150 tons of rock.
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