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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 firLal design. <br /> <br />The following discussion presents t:le 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 ,J_S presented in Volume II. <br /> <br />South J'latte River to J~l_~oE_lli~'Eb._~c. [)r..~:iI1.&"_.l->--"!Q..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 100-year <br /> <br /> <br />flood pl.ain. It is recommended tJtat the area west of the eastern limit <br /> <br /> <br />of the 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 lOO-year flood plain as shown in these drawings was <br /> <br /> <br />basecl on the UcS. Army Corps of Engineen,' 1963 studyc 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 wi thou! increasing the extent of the 100- <br /> <br /> <br />year flood plain in the futulCec The Fin;! .=ree], has been channelized <br /> <br /> <br />betw',en Sta c 78+00 to Sta c 108+00 to pass Ie le IOO-year no", c The chan.' <br /> <br /> <br />neli:~ation is required in this reach too Ilrevent overtopping of the <br /> <br />Brighton Road, <br /> <br />l'ul ton Oi tch to U c S. Hi "hwa. LilS ......_DI:,1'~iflg:,__l}_1..Jc2._-"J'.'L1.?,~ <br />~u~___._:..o....._.___ <br /> <br />The First Creek channel in this reach, Sta. 86+75 to 143+80, wiLl <br /> <br /> <br />not be channelized between Sta. 108+00 and l29+00 c The ex:i sting st ruc-c <br /> <br /> <br />ture:; under tile Fulton Ditch (18" diamet.f!r l:orrllgated metal pipe) and <br /> <br /> <br />Brighton Road (IS!! x 2411 concrete box culve:::-t) are not adequate to pass <br /> <br /> <br />the.OO-year stormc Both Fulton Ditch and Brighton Road well be <br /> <br />H1-2 <br />