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<br />tit Big Dry Creek Improved Inlet at Interstate 25 <br /> <br />The goal of this newly-constructed project is to pass the 1 DO-year storm event flow of Big <br />Dry Creek beneath Interstate 25, thereby reducing the upstream water surface elevation <br />which would inundate Westminster's Waste Water Treatment Plant. Improved inlet <br />techniques were employed to accelerate the flow to pass entirely within the existing 80' <br />dual-span bridge section. A curvilinear floor slab was utilized for the improved inlet which <br />transitions into a compound channel designed to carry sediment through the bridge at all <br />ranges of flow. Looking ahead to when the highway is widened and the bridge has passed <br />its service life, the bridge span should be wider and still incorporate the improved inlet <br />concept to efficiently pass flows under the highway. The improved inlet design calculations <br />are included herein for your information. Seepage flow path and steel sheet piling cutoff <br />wall calculations are also included for your information. <br /> <br />. <br /> <br />. <br />