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<br />Velocities of flow - W~ter velocities during floods <br />depend upon such f~ctors as sIze and shape of the cross sections, <br />conditions of the stream, and bed slope; all of these f~ctors vary <br />on different streams and at different locations along the same <br /> <br />I <br />I <br />I <br />. <br />I <br />. <br />. <br />1 <br /> <br />stream. <br />velocity <br />feet per <br /> <br />On the Big Thompson River In the study reach, the channel <br />for the 100-year flood, In general, ranges from 5 to 10 <br />second. The overbank velocity for the IOO-year flood <br /> <br />ranges, <br /> <br />In general, from 2 to 4 feet per second. <br /> <br />Rate of rise and duratIon of floodlnQ Rate of rise <br />and duration of flooding, for floods comparable tQ the IOO-yeer or <br />SOO-year flood, can very over e wIde rllnge. ^ flood of rlllnhll <br />origin on the Bl~ Thompson River at Loveland would peak approxl- <br />~te!y A hours from the time It begins to rise. This flood would <br />have an approximate duration of 20 hours. Slmllllrly, a flood of <br />rlllnfllll origin On the Big Thompson River at Its confluence with <br />the South Piette RIver would peak about 12 to 13 hours f~ the <br />tIme of Initlel rise and would have a duration of approximately <br />~hours. <br /> <br />" <br />