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The hydrologic and hydraulic analyses for the Dolores and West Dolones River <br />were performed by the U.S. Army Corps of Engineers, Sacramento D ~strict, as <br />documented in the report, Dolores River Montezuma Coun Colorado Flood <br />Insurance Studv Hydraulic Report (August 2005). <br />The hydrologic and hydraulic analyses for the studies conducted for the City of <br />Cortez were performed by Goff Engineering. The hydrologic evalua~tion was <br />documented in the report, Hvdrolo ig c Stud~ City of Cortez, Colorado (October 6, <br />2005). <br />The hydraulic analyses for the portion of the Mancos River both upstream and <br />downstream of the Town of Mancos were performed by Anderson Consulting <br />Engineers, Inc. as documented in the report, Montezuma County~ DFIRM <br />_ . _ . __ ~ __ ~. __ , . .-, , ~. , <br />Floodplain Report (August 11, 2006). <br />Except as noted below, the vector base map for the county was pro~ ided by <br />Montezuma County and the City of Cortez. The base map data consists of a <br />series of shape files based on the NAD83 horizontal datum, using the U M Zone <br />13N projection and includes the following: <br />(a) Transportation coverage - Included in this information is ithe road <br />centerline and airport information within the county. Road centerline <br />information was obtained from the Montezuma County and City pf Cortez <br />GIS Departments. Airports were digitized from the 2005 photo of the <br />county. <br />(b) Political boundazies - These data include all incorporated community, <br />military and federal facility, National Forest, and State Park boundaries. <br />These data were obtained from the Montezuma County GIS D~partment <br />and was aligned to the PLSS lines for the County. <br />(c) Public land survey system - These data were obtained from the Bureau of <br />Land Management and includes all section, township, atrtd range <br />information for the County. <br />(d) Hydrography - These data were initially obtained from the Montezuma <br />County GIS Department; then corrected by Anderson Gonsulting <br />Engineers, Inc. to coincide with the stream centerlines visible on~ the 2005 <br />aerial photograph. For areas where detailed studies were conducted <br />(Cortez Studies, Chicken Creek, Dolores River, Mancos Ri~ver, Lost <br />Canyon Creek, and the West Dolores R.iver) the stream cente~ line was <br />replaced with that utilized in the respective hydraulic study. <br />(e) National Geodetic Survey (NGS) benchmarks - The NGS benchmarks <br />were downloaded from the National Geodetic Survey/National Oceanic <br />and Atmospheric Administration website. <br />~ <br />~ <br />~ <br />2 <br />