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<br />'L :a. <br /> <br />IVIEMO~ANDUM <br /> <br />COLORADO WATER CONSERV AnoN BOARD <br />DARIES C. L1LE <br />DIRECTOR <br /> <br />DATE: June 13, 1997 <br /> <br />TO: File <br /> <br />FROM: Tom Browning <br /> <br />RE: Weld County flood of June 2,1997 <br /> <br />On June 11, 1997 Larry Lang and I performed field investigations in Weld County north of the <br />Greeley area. A significant rainstorm occurred on Monday, June 2 which cause1d flooding in <br />portions of the county. As part of the field work, we conducted rai.nfall bucke! surveys and <br />I <br />estimated peak discharges for several streams using indirect flow measurements. Following is a <br />summary of our findings : <br /> <br />STORM DESCRIPTION <br />· The storm developed in the late evening of June 2, and flooding occurred into the early <br />morning hours of June 3. The NWS issued a flash flood warning at 3:00 am bn June 3 for <br />central Weld County, and specifically for Crow Creek in the Barnesville area. <br />· Most or all of the rain fell within a 30 to 45 minute time period. <br />· Very little hail was produced by this storm. <br /> <br />RAINFALL ESTIMATES <br />Rainfall estimates were obtained through bucket surveys, interviews with local officials and <br />residents, and field observations. Rainfall estimates are shown (in inches) on the attached map. <br />These amounts generally occurred within a 30 to 45 minute time period. <br /> <br />FLOOD DAMAGES <br />A flood damage survey was not performed by CWCB staff. However, flood damages were noted <br />during the field visit which included basement flooding in numerlous homes, <br />erosion/washout/overtopping damage to several county roads, damage to crops Jld fields, and <br />debris accumulations. <br /> <br />RUNOFF ESTIMATE <br />Runoff estimates were obtained for several streams using indirect flow measurement techniques. <br />I <br />Channel cross-sections were estimated in the field using a hand level and a lOOt tape. High <br />water marks were good to excellent at all locations. The flow estimates are presenteo below: <br />I <br /> <br />Crow Creek at Cornish <br />Crow Creek at Barnesville <br />Willow Creek at Galeton <br />Owl Creek at Rd 90, u/s of Owl Creek Res. <br />Lone Tree Creek at Hw 14 <br />Lone Tree Creek near intersection of Rd 43/74 <br /> <br /> <br />150-250 cfs <br />900-1,200 cfs <br />30-50 cfs <br />600-900 cfs <br />150-250 cfs <br />400-600 cfs <br />