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<br />PASTFLOOOS <br /> <br />of intense precipit~tion and projectIon of Sj~rm movement gives <br />some le~d tIme for flash flood warnIngs; this inform~tlon is <br />promptly dlsserniMted to ~II news """dla and local offlcl~ls by <br />the best cornmunlc~tions ~v~ll~ble. <br /> <br />SUl+lARY OF HISTORICAL FLOODS <br />Large flood discharges have occurred In the studY reaCh <br />of the 81g Thompson River and the Little Thompson River. Tables <br />3,4,and 5 showdah collected "t thegllglng shtlonsoperlltedby <br />the U. S. GeologlclIl Survey IOCllted lit the mouth of the canyon east <br />of Orllke and 4 miles west of La SlIlle on the Big Thompson River <br />and at the stlltlon locllted 7.5 miles southwest of Berthoud on the <br />Little Thompson River. <br /> <br />Flood flqhtinq and emerqency evacuation plans - The <br />Larimer County and Boulder County Civil Defense Offices coordinate <br />disaster activities with the State Civil Defense Office. They feel <br />that they have adequate organization to meet any emergency. <br /> <br />Material storaoe on the flood plein - Floatable manmade <br />materiel stored on the flood plain Is often waShed away during <br />floods with the potential of collecting at points downstream. The <br />floodplain In the study reach is relatively clear of suchmateri<'l!s . <br />When floatable objects are stored on the flood plain, they should <br />be secured in some faShion. Other floatable material, Such as <br />trees, branChes, brUSh, and logs, Is In evidence along the rivers. <br />This material could form obstructions to floodflows, especially at <br />bridges, In the event of a flood. <br /> <br />TlIble 3 <br />Annual Peak olsChargesll for t)e Big Thompson River <br />flearOrak4 <br /> <br /> DlIte <br /> . <br />, 2"' 1906 <br /> . <br /> So, '''' <br />22 20e 19.41 <br />, Jun 1942 <br />19 2"' 1945 <br />21 2". 1947 <br />, 2". 1949 <br /> . <br />3 '"' 1951 <br />"'" 1957 <br />16 2". 1965 <br />31 2"' 1976 <br /> <br />Olschllr!'le <br />(c.f.s,) <br /> <br />6,000 <br /> <br />5,600 <br />4,690 <br />3,730 <br />7,600 <br />2,320 <br />3,BO <br /> <br />3,530 <br />2,040 <br />2,220 <br />31,200 (estlmeted) <br /> <br />1! <br /> <br />2/ <br /> <br />Only those yellrs hllvlng e peak dlsCh<'lrge of 2,000 c.f.s. or <br />grellter lira lndlclIted. <br />From U.S.G.S. GlIg1ng Station lit mouth of clInyon, ~OO feet up- <br />str.,arn frcw.HlIndv01tchdl"ersiondlltlland6mllesellstol Drllke. <br />Not a continuous record. <br /> <br />15 <br /> <br />. <br /> <br />" <br />