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<br />4. COST ESTIMATE <br /> <br />Cost Breakdown <br /> <br />Conceptual designs for all alternatives were prepared for the proposed improvements in sufficient <br />detail to determine and document construction quantities Slld subsequently, a planning cost estimate. <br />Topographic mapping at a scale of 1"=800' was used as basl~ 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 major charmel improvements at the HWY 6 and UPRR <br />. 3: I sideslopes for the low flow charmel downstrmm of HWY (; <br /> <br />. Drop Structures <br />. Concrete cutoff wall for the entire width of the charmel <br />. 5 feet of Type M Riprap upstream of the cutoff wall and 25 feet of Type H Riprap <br />downstream ofthe cutoff wall <br /> <br />. Standard Levees (tOO-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: I 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 />· FloodwalIs <br />. 1 foot thick <br />. Footing meeting CDOT standard drawings <br />. 3 feet of cover over footings <br />. 3 feet minimum of freeboard <br /> <br />1II-25 <br />