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<br />The l'iaterway under the aqueduct is adequatf:' Lo p8.SS the lOO-year fJood. <br /> <br /> <br />Near Station 921+00 it appears that in t~lle ")ast an old irrigation canal <br /> <br /> <br />cros:~ed First Creek. However, all stru(:t~ures u~;ed in this crossing, if <br /> <br /> <br />any, have beell washed away. Water from }'irst CJ-eek for the lOa-year <br /> <br /> <br />flool) will n01~ be carried away by the carLal under existing conditions at <br /> <br /> <br />the ]Joint of intersection. <br /> <br />Drainage\{ay improvemen,ts recommended fo r th is reach are limited to <br />Flood Plain Zoning. <br /> <br />?iccadilly'~oad to _ 26.!:I1A',','=.'1l1E-'::.J)r:,,,~I~g:; 2().L~l..~!1.<!...~? <br /> <br />The reach extends from Station 9"1+;:5'0 Station 1,039+60. First <br />Creel< in this reach and approximately up tu Station 1,026+00, flows in a <br />well defined channel and the 100-year fl(,od plain is not wide. Immed- <br />iate:ly downst~ream from 26th Avenue the creek is less defined and runs <br />through a flat wide area resulting in a ,'ide 100--year flood plain. It <br />is recommended that Flood Plain Zoning be' adopted for the enti.re reach. <br /> <br />It is not: proposed to provide any st.ru(:tura:1 improvements to the <br /> <br /> <br />exisl~ing cros~;ings. Exist:ing roadway bridgl~ at Piccadilly Road crossing <br /> <br /> <br />is adequate to pass the 10-year flood flow; however, the lOO-year flood <br /> <br /> <br />f Low will overtop the bridge. The freqUEnc:1 of overtopping the bridge, <br /> <br /> <br />and !lossible elamages to the bridge, do ne,t .iusti,fy major structural <br /> <br /> <br />changes. <br /> <br />~~.!:l1... A ve n ue !.()_} n t eEs_ta,~,e u~_igl1.waJ} (I ,.': J)r~a w i n..&s__.2l:.an..'!.n <br /> <br />This reach extends from Station l,039+60 to Station 1,112+60. The <br />flood plain is fairly wide. The devel:)pmeILL in this area lS net consid- <br />erab:_e and hence no channelization has bEen recommended. It is recom- <br />mend{~d that fl.ood plain zoning lle adopted f(lr thE~ entire reach. <br /> <br /> <br />No structural improvements are propcsecl for" the 26th Avenue cros- <br /> <br /> <br />sing. the Union Pacific Ra:._lroad cross ing) :;mitb Road crossing and the <br /> <br /> <br />Gun C:lub Road crossing. The existing ~ridgE~ at the Union Pacific Rail- <br /> <br /> <br />road crossing is adequat.e to pass t~e 10e-year flood flow, while the re- <br /> <br /> <br />mainjng ~hree road crossings in this reach ~lj,J.l tle overtopped when a <br /> <br /> <br />LOO-year flood occurs. <br /> <br />lI:;~-'9 <br />