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<br />Gu ICh, a~d S"mJer50~ Gu Ich all have w~tor stara'Jo reservoirs. These <br />tour streams plus Van Bibber Cre'ck all have d IVer5io~ cana 15 cross- <br />ing them. During ~inor floodina the water stor~ae reservoirs ~nd <br />canals hold a large portion of tho floodwaters making the floOdS <br />fartherdownstreamappeilrespoclil1lymTld. Howover,duringtl1e <br />largo floods, the reservoirs ann c~nals fIll qulcidy and ''lust sp; i I <br />w"ter. \;Ith tho stordge spacos full thereisanabruptchangetrom <br />minor to major flooding. <br /> <br />generally considered hazardous. Thoseconditlonswouldbo:>producej <br />by large floods at various locations On each of the five streams <br />covered In this report. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />, <br /> <br />. <br /> <br />. <br /> <br />FLOOD CONTROL AND DEFENSE is Ilmit~ to channel stralghten;ng and <br />enlargement through the more urbani led areas. The channel capacities <br />hilveooon increased by the alterations, but are not adequate to <br />contaIn floods of the size studied in this report. <br /> <br />THE CAUSE OF FLOODS on the five streams covered in this report is <br />primarily from high intensity thunderstorms. Thefloodsareespe- <br />ciallyscvere if the thunderstorms followa period of hiqhSllOwmelt <br />or prolonged rainy weather. <br /> <br />. <br /> <br />, <br /> <br />. <br /> <br />GREAT FLOODS have undoubtedly occurred on the streams ~overed In <br />this report, bvt the events have not been recorded because of the <br />small size of the streams and the lack of extensive urbanization. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />FLOOD DAMAGES wovld occur on ""chot tho strodms tor floods of tho <br />size studied in this report. D';""dg..S would be most ext"osive on <br />Rei stan Craek and Lena Guich because they have th" most urbaniZaTion <br />On the flood plains. Damages would re~ult from basement and ground <br />floor flOOding, erosion to streets ~nd yaros, and the deposition of <br />siltanddebris. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />OIJRATio.'l OF FLOODI~jG is brIef d"" to the steep slopes and SfJI/lII si le <br />of the drainage areas. Ingeneral,thoduratlonoffloodingwould <br />Increase In the downstro"m direction due to the flatter channel <br />slopes and -the incre"sed sile of the drainage "rea. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />HAZARDOUS CONDITIONS occur during flooding be~"use of the rapidly <br />rising streams, high velocities, and deep Ilows. Velocities exceed- <br />ing 3 feet per second combined with depths of 2 feet or more are <br /> <br />2 <br /> <br />; <br /> <br />I <br />