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<br />liver in <br />first <br />I collected <br />the larger <br />snm/me I t <br /> <br />la Poudre <br />These <br />contained <br />quite <br /> <br />e numerous <br />,sica I <br />: the <br />lith <br /> <br />e of <br /> <br />I <br />I <br />! <br />i <br />, <br />I <br />/ <br /> <br />: <br /> <br />looding on the Cache la Poudre <br />nse precipitation are indicated <br />e National Weather Service <br /> <br />PAST FLOODS <br /> <br />-' <br />.0 rout i ne four times dai I y fore- <br />ISts of severe storms and issues <br />IS requ ired. <br /> <br />SU~1MARY OF HISTORICAL FLOODS <br /> <br />Several floods have occurred on the Cache la Poudre River in <br />the Fort Col I ins to Greeley vicinity since flood records were first <br />maintained. This is indicated by tables 5 and 6 which show data collected <br />at two stream gages on the Cache la Poudre River. Accounts of the larger <br />floods indicate that rainfall or a combination of rainfall and snowmelt <br />normally produce the floods. <br /> <br />3nCY evacuation plans - Emergency <br />study reach are coord inated through <br />unty and in Weld County. These <br />and, based upon past experience, <br />On and equipment to meet any flood <br />ul to local planners responsible <br />by defining potential flood hazards. <br /> <br />. <br /> <br />FLOOD RECORDS <br /> <br />Two U.S. Geolo~ical Survey stream gages on the Cache la Poudre <br />River record flood data in the Fort Collins to Greeley vicinity. These <br />ga~es are described on page 14. Reviewing the stream gage data contained <br />in tables 5 and 6 indicates that peak discharge attenuation is quite <br />evident between the two gages. This can be accounted for by the numerous <br />diversion structures between the two stream gages and by the physical <br />characteristics of the intervenlna flood nlain.' ihis portion of the <br />Cache la Poudre River flood plain is relatively broad and flat with <br />intermittent depressions and embankments conducive to the storage of <br />. floodwaters. <br /> <br />flood plain - Often floatable <br />lain is washed away durin~ floods <br />flood plain in the study reach <br />t <br />.uch materials. Where floatable <br />ain, securing it in some fashion wil I <br />jnal flood hazard. Other floatable <br />, brush, and logs is clearly evident <br />and tributaries and can pose serious <br />event. <br /> <br />j <br />j <br />i <br />, <br />, <br />f <br />i <br />i <br /> <br />17 <br /> <br />18 <br />