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<br />~ <br /> <br />, <br /> <br />SWP 1150-2-1 <br />26 &y 78 <br /> <br />10. ROADWAY CROSSING OF nOODWAYS. <br /> <br />a. Permanent Roadways. <br /> <br />(1) Carefully analyze new roadways or roadways being rebuilt or <br />modified as to their effect on the hydraulic capacity of the floodway <br />and to their adverse effects on the existing or approved levees. The <br />low steel of the bridge shall have an elevation not lower than the crown <br />of the levee or '3 feet above the design water surface, whichever is <br />higher. Additional clearances will be required for fixed spans over <br />navigable waterways on a case-by-case basis. <br /> <br />(2) Any roadway over a navigable stream will require a permit from <br />the US Coast Guard. <br /> <br />(3) Plans including computations relat'ing to the effects the <br />proposed work will have on flows and floodway capacity will be required <br />for review and c01lDllent. <br /> <br />b. Temporary (Raul) Roadways. <br /> <br />, (1) Provide drainage structures to convey low-flow discharges. <br />Rald roadway fill to a minimum to prevent increasing the water surface <br />elevation should a flood occur during the period the roadway is in <br />place. Construct all ra1llpS from levees going in a downstream direction. <br />This will prevent flows from being directed into the face of the levees. <br /> <br />(2) Kemove all materials (fill, drainage structures, etc.) upon <br />completion of construction. Restore all disturbed areas to original <br />grade and restore turf. <br /> <br />(3) Plans including computations relating to the effects the pro- <br />posed work will have on flows and floodway capacity will be required for <br />review and c01lllDents. <br /> <br />11. LlN DAMS OR DIVERSION or FLOWS. <br /> <br />( <br /> <br />a. Lev 1lalllS or Other Obstructions. Submit plans and s?ecifications <br />for review and comments prior to the construction of any type dam <br />structure in a floodway area. These plans including computations will <br />be reviewed to determine if adverse hydraulic or structural effects <br />would occur within the floodway as a result of the proposed construc- <br />tion. Prior to an extensive engineering study for any tYpe of water <br />barrier in a floodway, the concept plan, proposed location, and purpose <br />should be reviewed by the Corps of Engineers. <br /> <br />I <br /> <br />, b. Diversion of flows into or out of a floodway area shall be <br />reviewed as to possible adverse hydraulic or structural effects. <br /> <br />7 <br />