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<br />I <br />I <br />I <br />I <br />II <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 /> <br />VII. COST ESTIMATE <br /> <br />Conceptual designs for all alternatives were prepared for the proposed improvements in sufficient <br />detail to determine and document construction quantities and subsequently, a planning cost estimate. <br />Topographic mapping at a scale of 1"=800' was used as base mapping for conceptual designs. Criteria <br />used for preparing quantities were as follows: <br /> <br />Channel Sections <br />+ Trapezoidal section <br />+ Size using normal depth or HEC-2 <br />+ 2: 1 sideslopes for the maj or channel improvements at the HWY 6 and UPRR <br />+ 3: 1 sideslopes for the low flow channel downstream of HWY 6 <br /> <br />Drop Structures <br />+ Concrete cutoff wall for the entire width of the channel <br />+ 5 feet of Type M Riprap upstream of the cutoff wall and 25 feet of Type H Riprap <br />downstream of the cutoff wall <br /> <br />Standard Levees (100-Year) <br />+ 10 feet top width <br />+ 3: 1 sideslopes <br />+ 3 feet minimum of freeboard <br /> <br />Overtop Levees (50-Year) <br />+ 10 feet top width <br />+ 3: 1 sideslopes <br />+ Riprap slope protection <br />+ No freeboard <br /> <br />Ring Levees <br />+ 10 feet top width <br />+ 3: 1 sideslopes on the channel side <br />+ 5: 1 sideslopes on the landward side <br />+ 3 feet minimum of freeboard <br /> <br />Floodwalls <br />+ 1 foot thick <br />+ Footing meeting CnOT standard drawings <br />+ 3 feet of cover over footings <br />+ 3 feet minimum of freeboard <br /> <br />Road Raises <br />+ 24 feet wide pavement section <br />+ 3: 1 sideslopes <br />+ Maximum 5% longitudinal slope <br /> <br />21 <br />