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<br />7. <br /> <br />Reinforcement steel (Major Orainageway) <br /> <br />a. Steel reinfor.cement shall be minimulIl grclde 40 deformed <br />bars. Fabric mesh may also be approved. Wire mesh shall <br />not be used. <br /> <br />b. Ratio of longitudinal steel area to concrete cross <br />sectional area shall be greater than 0.005. <br /> <br />c. Ratio of tr"msverse steel area to concrete cross <br />sectional area shall be greater than 0.0025. <br /> <br />d. Reinforci.ng steel shall be placed at the center of the <br />section with a minimum clear cover of three inches <br />adjacent to the earth. <br /> <br />e. Additional ste!el shall be placed as needed if a retaining <br />wall structur,!~ is used. <br /> <br />8. <br /> <br />Earthwork (Major Orainageway) <br /> <br />The following areCls <br />maximum density as <br />Proctor): <br /> <br />shall be compacted to at least 95% of <br />determined by ASTl'[ 0-.698 (Standard <br /> <br />a. The 12 inches of subgrade immediately beneath concrete <br />lining (both channel bottom and side slopes). <br /> <br />b. Top 12 inches of maintenance road. <br /> <br />c. Top 12 inches ,of earth surface within 10 f'~et of concrete <br />channel lip. <br /> <br />d. All fill material. <br /> <br />9. <br /> <br />Bedding (Major Ora:i.nageway) <br /> <br />Provide six inches :)f granular bedding equivalent in gradation <br />to %" concrete aggregate (Standard Specifi~ons for Road & <br />Bridge Construction, COOT, latest revision) under channel <br />bottom and side slopes. <br /> <br />10. <br /> <br />Underdrain (Major Drainageway) <br /> <br />Longitudinal underdrains shall be provided on 10-foot centers <br />and shall daylight at the check drops. Wl~ep holes shall be <br />provided in vertical wall sections of the channel. <br /> <br />11. <br /> <br />Safety Requirements: (Major Drainageway) <br /> <br />a. A six-foot hi:.h vinyl coated chain. link or comparable <br />fence shall be: installed to prevent access wherever the <br />lOa-year channel flow depths exceed three feet. Gates, <br /> <br />5 - 10 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />