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DRAINING 4 , <br /> f � °-4' <br /> c p <br /> Figure U.—Construction plans <br /> for a single-fence rock jl <br /> check dam. <br /> 9 A, Section of the dam <br /> e h parallel. to the center- <br /> f fh line of the gully. <br /> B, Section of the dam at <br /> the cross section of the <br /> gully. a = original gully <br /> B bottom; b = original <br /> gully cross section; c <br /> = spillway; d = crest <br /> of freeboard; e = exca- <br /> ` vation for key; f = ex- <br /> 3 cavation for apron; g = <br /> b end sill; h = steel <br /> fencepost; k = guys; <br /> d c d j = rebar, 13 mm in <br /> diameter. <br /> We <br /> %� h <br />