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<br />Burling..1:on Di tch <br /> <br />The Burlington Ditch crosses the wide flood plain of First <br /> <br /> <br />CreE~k without a drainageway across it" ThE' ditch is designed to carry <br /> <br />300 cfs. It is proposed t_o provi,de an opert {'lullle for the ditch with the <br /> <br /> <br />Fint Creek flowing below. The flume wIll b,> 8.33' "ide and 5.0' deep. <br /> <br />The depth of flow in the flume will be 4.0 <br /> <br />The flume will cross the <br /> <br />First Creek channel over two pieL~; with t_hr'ee ~;pans each of 52.0r. The <br /> <br /> <br />First Creek flood channel side slopes in this reach has been steepened <br /> <br /> <br />frorr 4H:IV to 2H:IV. The side slopes will be stabil.zed with riprap in <br /> <br /> <br />this reach. <br /> <br />O'Brian Canal <br /> <br />The First Creek channeliza1.ion wilJ, t:erminate at the O'Bri,an <br /> <br />Canal. The flow in the First Creek will enter the O'Brian Canal and <br /> <br /> <br />will be discharged over a side channel s~lJlway into the flood channel <br /> <br /> <br />as shown. The side channel spillway desigr\ will be carried out by <br /> <br /> <br />Farmers Reservoir and Irrigation Compiiny and wi,),l be designed to pass <br /> <br /> <br />the 100-year flow. The proposed First Creck channel downstream of <br /> <br /> <br />O'Brian Canal as provided w{11 be modIfied after the side channel .pill- <br /> <br /> <br />"ay is finalized. <br /> <br />o ' Brian C ana Do_9Ji..1:il~''.':.n~J~' ])r:a",~IIL.L~,,--n_(LL4. <br /> <br />In this reach the First Creek will Tlot be channelized except be- <br /> <br />twee.l Burlington Railroad at Station 218--80 to Highway 2 at. Station <br /> <br /> <br />220+10, which has been designed to pass the 100-year flow. Pipe inlet. <br /> <br /> <br />will be provided in the flood channel banks to drain the area betl>'een <br /> <br /> <br />the railroad and Highway 2. Upstream of Hi.'5hway 2, the creek has been <br /> <br /> <br />channelized for a distance of 500 feet for Low [lows in order to provide <br /> <br /> <br />suitable entrance conditions to the Higlmay 2 bridge. The 100-.year <br /> <br /> <br />flood plain limit under future conditio"" just downstream of 96t.h Avenue <br /> <br /> <br />will be influenced by the flow conditio"" upstream of 96t.h Avenue. At <br /> <br /> <br />present flood plain information immediatE~ly upsLream of 96t.h Avenue is <br /> <br /> <br />not available. The diking immediately uf'st"earn of 96th Avenue ",ill <br /> <br />IU.-b <br />