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<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 />I <br />I <br />I <br />I <br />I <br /> <br />size of street dropouts. The box is not so undersized that it <br /> <br />warrants reconstruction. <br /> <br />A 9 by 9 concrete box culvert is lo- <br /> <br />cated beneath Academy Boulevard, This structure is properly sized <br /> <br />but should be subject to inlet improvement, West of this, a <br /> <br />presently unlined ditch follows the middle of Dublin Drive to a <br /> <br />point about opposite West wicklow circle, The ditch is properly <br /> <br />sized, especially if lined, but all culverts along the ditch line <br /> <br />(at crossings and outlet) are badly undersized, The exit from <br /> <br />this ditch to Cottonwood Creek is being rebuilt and enlarged. After <br /> <br />this construction, it is still too small to carry the full lOa-year <br /> <br />flow. The choice at this point is to increase this exit again, or <br /> <br />to allow an overflow of over 600 cfs onto Dublin Drive, <br /> <br />The Northerly basin, B, contains a <br /> <br />number of bridges and large boxes, At the outfall to this basin, <br /> <br />three bridges exist. The first is another large masonry arch at <br /> <br />the old railroad right-of-way, The second is a concrete bridge <br /> <br />at Interstate 25, The third is a concrete bridge at an access <br /> <br />road which is an extension of Gillen Road, All three of these <br /> <br />structures are adequate to allow free passage of the lOa-year <br /> <br />channel flow, <br /> <br />On Academy Boulevard, between <br /> <br />Jamboree Drive and Briargate Road, a large concrete box system <br /> <br />exists, This a double 6 by 6 concrete box extending across Academy <br /> <br />Boulevard and curving beneath a subdivision and Kelly Johnson <br /> <br />Boulevard. This structure is nearly 900 feet long and discharges <br /> <br />-20- <br />