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<br />MEMORANDUM <br /> <br />. <br /> <br />COLORADO WATER CONSERVATION BOARD <br />DARIES C. LILE <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 caused flooding in <br />portions of the county, As part of the field work, we conducted rainfall bucket surveys and <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 waming at 3:00 am on June 3 for <br />central Weld County, and specifically for Crow Creek in the Bamesville 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 />. <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 numerous homes, <br />erosion/washout/overtopping damage to several county roads, damage to crops and fields, and <br />debris accumulations, <br /> <br />RUNOFF ESTIMATE <br />Runoff estimates were obtained for several streams using indirect flow measurement techniques. <br />Channel cross-sections were estimated in the field using a hand level and a 100' tape, High <br />water marks were good to excellent at all locations, The flow estimates are presented below: <br /> <br />. <br /> <br />Location Est. Peak flow <br />Crow Creek at Cornish 150-250 cfs <br />Crow Creek at Barnesville 900-1,200 cfs <br />Willow Creek at Galeton 30-50 cfs <br />Owl Creek at Rd 90, u/s of Owl Creek Res, 600-900 cfs <br />Lone Tree Creek at Hwv 14 150-250 cfs <br />Lone Tree Creek near intersection of Rd 43/74 400-600 cfs <br />