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<br />All exceptions to the above definition will be defined in detail <br />wherever they occur. <br /> <br />These drawings should not be used fJr final_ construction of indivi- <br /> <br /> <br />dual structures without a detailed investigat:iofl of topography, utili- <br /> <br /> <br />ties, and other items normally required for filLal design. <br /> <br /> <br />The following discussion presents t:l€ desi.gn criteria and philo- <br /> <br /> <br />sophy used in arriving at the proposed drainageway improvements. The <br /> <br /> <br />order of discussion follows the drawings order a,s presented in Volume II. <br /> <br />South Platte River to Ful~o[U)i~'Eb__~.. [)ra.~:iI1.&"_JJ->--.!.Il..Land _.~~ <br /> <br />A sizeable portion of the First Cre(~k basin in this reach extending <br /> <br />from Station 0+00 to 86+75 i. within the South Platte River lOa-year <br /> <br /> <br />flood pl.ain. It is recommended t.hat the area west of the eastern limit <br /> <br /> <br />of lhe South Platte River 100-year flood plain be zoned as a flood plain <br /> <br /> <br />and no structural drainage improvements 1Je iritiated in the reach. The <br /> <br /> <br />South Platte River 100-year flood plain as shown in these drawings was <br /> <br /> <br />base" on the U.S. Army Corps of Engineen;' 1963 study. Sand and gravel <br /> <br /> <br />minirlg operations should be monitored by ap:propriate agencies so that <br /> <br /> <br />adeqlate draillageway is maintained to as~;tire that F:irst Creek water <br /> <br /> <br />reaCles the South Platte River without increasing the extent of thE: 100- <br /> <br /> <br />year flood plain in the futulCe. The Fin;t .=ree], has been channelized <br /> <br /> <br />betw',en Sta. 78+00 to Sta. 108+00 to pass Ie le 100-year no",. The chan.. <br /> <br /> <br />neli:~ation is required in this reach t,o Ilrevent overtopping of the <br /> <br /> <br />Brighton Road. <br /> <br />]'111 ton Di tch to _U~.-.l[iJ;.tJ..':'aLilS ._::_D_':'1'~iflg:,_.l}_1..Jc..~_.."J'.'L1.?,~ <br /> <br />The First Creek channel in this reach, Sta. 86+75 to 143+80, wiLl <br />not he channelized between Sta. 108+00 and 129+00. The ex:i sting st ruc-. <br />ture:; under tile Fulton Ditch (18" diamet.f!r l:orrllgated metal pipe) and <br />Brighton Road (IS!! x 2411 concrete box culve:::-t) are not adequate to pass <br />the :OO-year storm. Both Fulton Ditch and Brighton Road will be <br /> <br />H1-2 <br />