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<br />Burlington Ditch <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 /> <br />300 cfs. It is proposed too provi.de an operl ('lullle for the ditch with the <br /> <br /> <br />Fint Creek flowing belowc The flume wIll b,> iL33' wide and Sea' deepc <br /> <br /> <br />The depth of flow in the flume will be L, c I). 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 r~~ach has been steepened <br /> <br />froIT 4H:IV to 2H:IVc 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 D'Bri,an <br /> <br />Canale 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 spill~ay desigr\ will be carried out by <br /> <br /> <br />Farmers Reservoir and Irrigation Compiiny and wi.l.l be designed to pass <br /> <br /> <br />the lOa-year flow. The proposed first Creek channel downstream of <br /> <br />O'Brian Canal as provided w{ll be modIfied after the side channel .pill- <br /> <br /> <br />way is finalizedc <br /> <br />0' Brian Cana~o 96th A''.':.n~J~:- ])r:a_\oI~llg_.L~,,-n_(LL!' <br />- ------.---- <br /> <br />In this reach the First Creek will Tlot be channelized except be- <br /> <br />twee.l Burlington Railroad at Station 21a..gO to Highway 2 at Station <br /> <br /> <br />220+10, which has been designed to pass the lOa-year flow. Pipe inlet. <br /> <br /> <br />will be provided in the flood channel banks to drain the area bet,,'een <br /> <br /> <br />the railroad and Highway 2 c Upstream of Hi.shway 2, the creek has been <br /> <br /> <br />channelized for a distance of SOD feet for Low [lows in order to provide <br /> <br /> <br />suitable entrance conditions to tbe Higlmay 2 bridge. The IOO-cyear <br /> <br /> <br />flood plain limit under future conditio"" .just down.tream of 96th Avenue <br /> <br /> <br />will be influenced by the flow conditio"" upstream of 96th Avenuec At <br /> <br /> <br />present flood plain information immediatE~ly upsLream of 96t.h Avenue is <br /> <br /> <br />not availablec The diking immediately upst-eam of 96th Avenue ",ill <br /> <br />JTL-6 <br />