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<br />.- <br />. <br /> <br />. <br /> <br />. <br />, <br /> <br />SWIlP 1150-2-1 <br />26 ll4y 78 <br /> <br />10, ROADWAY CROSSING OF FLOODWAYS. <br /> <br />a. Pel'1llanent Roadways. <br /> <br />(1) Carefully analyze new roadways Dr roadways being rebuilt Dr <br />modified as to their effect on the hydraulic capacity of the floodway <br />and to their adverse effects on the existing Dr approved levees. The <br />'low steel of the bridge shall have an elevation not lower than the crown <br />of the levee Dr ) 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-e8se 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 relating to the effects the <br />proposed work will have on flows and floodway capacity will be required <br />for review and cOllllDent. <br /> <br />b. Temporary (Haul) Roadways. <br /> <br />, (1) Provide drainage structures to convey low-flow discharges. <br />Hold 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 ramps from levees going in a downstream direction. <br />This will prevent flows from being directed into the face of the levees. <br /> <br />(2) Remove 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 comments. <br /> <br />U. LOW DAMS OR DIVERSION OF FLOWS. <br /> <br />{ <br /> <br />a, Low Dams or Other Obstructions. Submit plans and specifications <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 />., <br /> <br />, b, Diversion of flows into or out of a floodway area shall be <br />reviewed as to possible adverse hydraulic Dr structural effeces. <br /> <br />7 <br />