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<br />. $100,000 in flood mitigation and emergency response costs for more than 9 <br />different government agencies involved in the flood response <br /> <br />No estimates were found for lost business revenue or any increase in transportation costs <br />to trucking companies due to the closure ofInterstate 70. <br /> <br />No injuries or casualties were reported from this event. This is most likely due to <br />evacuations of approximately 220 properties using the town's reverse 911 system as well <br />as door-to-door evacuations. <br /> <br />Several special factors were thought to have contributed to the effects of the flood. The <br />major factor being the failure of a Corrugated Metal Pipe (CMP) that crosses under the <br />interstate. This failure caused a 20 by 20-foot sinkhole to form under 1-70 closing the <br />interstate to all traffic for several days. The culvert failure also caused Bighorn Creek to <br />leave its flow path inundating the eastern part of Vail. Once the culvert failed and water <br />began to pool along 1-70, the flow traveled northwest until it encountered the box culvert <br />at the Columbine Street Underpass. The water traveled through the culvert and emptied <br />into the East Vail neighborhood flowing through local streets and residences before <br />finally emptying into Gore Creek once again. <br /> <br />Based upon information provided by CDOT, and based upon the data provided by the <br />USGS gage station on Bighorn Creek, it is apparent that the design capacity ofthe culvert <br />under 1-70 was not exceeded. Rather, it is believed that abrasion and corrosion occurred <br />in the pipe invert, resulting from potentially years of high flow velocities coupled with <br />high sediment bed load. It is further believed that a grade break in the pipe slope may <br />have contributed to failure at a pipe joint. The original pipe was a 66-inch CMP laid at a <br />slope varying from 8% to 15%. Bury depth of the pipe was approximately 40-feet deep. <br />It is believed that the pipe invert buckled upwards, allowing flows along the outside of <br />the pipe, which washed away soil supporting the pipe, creating the sinkhole. <br /> <br />A site visit was conducted on Tuesday June 19, 2003 by several ICON Engineering <br />personnel. At that time, repair ofthe CMP was still actively underway. In fact, <br />construction ofthe repairs continued on a 24-hour basis, seven days a week for a six <br />week period. Enclosed with this report are several pictures ofthe area that was impacted <br />by the flooding. The pictures are provided by the City of Vail, and by ICON Engineering <br />as noted. Additional information was provided courtesy of CD aT. <br /> <br />ICON"">"""""""I_ <br /> <br />8 <br /> <br />S<fI-tu. Z003 <br />