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<br />Executive Summary <br /> <br />The following is a short summary of the flooding that occurred in 2001 for the specific areas <br />within the State of Colorado. <br /> <br />Colorado Springs <br /> <br />. A localized rainstorm and significant flooding were reported for August 31, 2001. <br /> <br />. A NOAA Event Record indicates that more than 5 inches fell in approximately 5 hours, <br />equivalent to a greater than tOO-year event locally. The storm was very localized around the <br />downtown area. <br /> <br />. Flow data for Monument Creek and Fountain Creek for September 1st indicated little impact from <br />the storm. <br /> <br />. As the storm was very localized, only a small area near downtown was affected, and no creeks <br />were reported to have overtopped their banks. <br /> <br />. The primary cause of flooding was associated with lightning, which caused a lift station failure. <br />With the pumps out and a heavy local rainfall, two to three feet of water inundated Interstate 25, <br />which was closed for at least seven hours. <br /> <br />. Damage to the pumps and other electrical equipment cost CDOT approximately $30,000. <br />CDOT estimated cleanup costs at approximately $2,000. <br /> <br />. A drop structure construction project in Monument Creek was damaged during the event, <br />costing the City approximately $30,000. <br /> <br />. No private property damage was reported. <br /> <br />Greeley <br /> <br />. A large localized rainstorm was reported for July 13th, 2001 for the Greeley area. <br /> <br />. Research indicated very significant flooding and property damage from this storm. Three- <br />foot deep water was reported in some areas of Greeley, including downtown areas. <br /> <br />. The National Climatic Data Center indicates that from 3 to 5 inches of rainfall fell in less <br />than 2 hours on July 13th. This event is equivalent to at least a 100-year frequency event <br />locally. <br /> <br />. Damages and impacts included several flooded basements (among them City Hall), stranded <br />motorists due to inundated streets, and an electrical outage for approximately 2,300 residents. <br />A NOAA Event Record listed an estimated total of $600,000 in property damages. <br />Damage at City Hall was estimated to be approximately $250,000. <br /> <br />Holyoke <br /> <br />. A storm was reported for September 7, 2001 for the Holyoke area. <br /> <br />. Preliminary data from NOAA indicates that 0.57 inches of precipitation fell in less than <br />one hour - less than a 2-year frequency event. <br /> <br />URS <br /> <br />T:\PROJ ECTS\6844888 _ CWCB _FLOOD_DOC _RPTS\SUB _00\6.0 _PROJ_DELlV\REPORT\FI NAL REPORT .2. D0Q20-MAR-02\\ E S - 3 <br />