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<br />Greeley has current Zoning ordinances restricting development wIthin an <br />area less than two hundred feet either side of the centerline of the Poudre <br />River. Nosfructures,excavatlon,fllllng,oropenstorageispermlfted <br />within a zone between 200 feet and 100 feet either side of the stream <br />centerline unless such action Is first approved by the City Engineer. For <br />approval the main fioor of InhabIted buildings are to be located above the <br />water level of the 50-year flood; bas~ents are prohibited, open storage <br />of materials require fencing; flammable liquids are prohibIted; buildings <br />should offer minimum obstructIon to flood flows; and buildings cannot <br />occupy more than fifty percent of the lot area. No structures, excavations, <br />filling or open stof"<'lge Is permitted withIn the zone 100 feat either side <br />of the stream centerlIne. <br /> <br />Flood fl~htlnn and emernency evacuation plan~ - E~erQency <br />actions in tho ev~nt of a flood In the stUdy rn~ch arC coordinated throunh <br />the local Civil Defense 0/1' Ice in Greeley. The community ~oes not h~ve a <br />~p~illc flood ~~~rn~ncy pier, but leel that their disaster contlnnnnCY <br />p!a'ls Caver such an enmrooncv. Past e><Derif'nce ~as nrov"d t~at 10011 <br />"'anpowarandenuiprnent Is su/ficient to deal with Ilood nrohlems. It is <br />hor~d t~at this report will be uselul to local planners re"oonsiblc for <br />action In future flood emer~encies by ~olpino them to defino the potenti~1 <br />hazards involved. <br /> <br />Other factors and their Impacts - The Impact of flooding along <br />the CaChe la Pbudre River can be affected by t~e ability 01 local residents <br />to anticipate and effectively r~ct to a flood emergency. WarnIng of a <br />coming flood makes orderly evacuation possible and allows for some <br />damageable material to be moved from flOOd hazard areas. A plan lor <br />emergency action should a flood occur Is necessary to esf'lbl ISh lines <br />of authority and areas of responsibilIty and to Insure that vital equip- <br />ment and supplies will not be lacking. DurIng a flood, floatable material <br />in ~~t'l flood plaln can creat.. problems b.y blocking stre"m 'Io~ "I constricted <br />openings such as bridges. <br /> <br />~1a ter i a I s foreqe on the f I cod 0 I a i n - lnose ma tor I a I s <br />stored on the tlood olain are oicked up by floodwaters and often lodoe at <br />obstructions such as brldees. constrictinq fiows and causlno hlnher water <br />surfaces on the upstream side. This i"notasevarnproble", inth" rural <br />,Jrf'as 01 the study reach. hut at Greoley there "re resid"ntlal and Commer- <br />C ial areas where trash, I iqht sheds, foncos, storaoa tanks ,~nd barrels, <br />bo~as. and ot~er buoyant Items could cause probl~s. This is true in <br />areaS between the Rth Avenue brdioe and tho V. S. Hiohway 8~ brldnn. <br /> <br />FlOOd warnIng and forecasting - The Nat!onal Weather Service, <br />Denver OffIce provides generalIzed flash flood warnings when rainfall reports <br />or radar indicate heavy runoff-producing rains are occurring. Weld County <br />Is under the radar umbrella of the WSR-57 radar at Limon, Colorado which <br />has the capability of detecting areas of Intense precipitation. Special <br />forecasts of severe storms are made as required. <br /> <br />" <br /> <br />" <br />