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, '. DRAFT REPORT Weld County Flood Disaster of July 29-30, 1989 STORM DESCRIPTION On Wednesday, August 9, 1989, George Goodell, Weld County Roads Supervisor; Larry Lang and Mark Matulik, CWCB, performed a field survey of the affected areas in Weld County which sustained damage from a thunderstorm-induced flooding event which began at 3 p.m. on Saturday, July 29 and was followed by a general rainstorm which lasted until approximately 10 a.m., Sunday, July 30. Preliminary investigations resulting from discussions with local residents in the affected area indicate that a rainstorm with a peak intensity of 8.3 inches in hour/minutes began in north central Weld county at 3 p.m. on July 29, roughly centered over the Lone Tree Creek drainage. Other streams which contributed to the flooding event include at least two tributaries to Lone Tree Creek and Owl Creek, Crow Creek and several irrigation ditches which were breeched or failed as a result of the intense rainfall. The center of the thunderstorm was located near the intersection of Weld County roads 49 and 70. Rain gage information from verifies that 8.3 inches of rain fell in a -minute time period at this location. Just to the south, at~he intersection of C.R. 49 and State Hwy. 292, Mr. George Weber verified that he had 7.5 inches of rain accumulate in his rain gage between 3 and 4 p.m. Four miles to the south at Lone Tree Creek's intersection with 8th Street, Mr. Herman Hoff witnessed the flood event as it passed under the bridge. Field surveys indicate that cfs passed through the bridge structure at p.m. on Saturday, July 30, 1989. Interviews with other local residents including have been confirmed and used to develop the attached rainfall distribution map.