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<br />. <br /> <br />October 1981 <br />SPECIAL STUDY <br />CACHE LA POUDRE RIVER BASIN <br />LARIMER-WELD COUNTIES, <br />COLORADO <br /> <br />VOLUME II <br />HYDROLOGY <br /> <br />Introduction <br /> <br />BACKGROUND <br /> <br />The Cache 1a poudre River basin in Colorado is in a rapidly growing <br /> <br /> <br />area. The population of Larimer and Weld Counties increased by about <br /> <br /> <br />60 percent between 1970 and 1980. The basin contains a number of flood <br /> <br /> <br />hazard areas, from narrow canyon flood plains in the mountainous west <br /> <br /> <br />to wide valley flood plains in the east. Local interests are concerned <br /> <br /> <br />about the changing nature of the flood hazards in the basin as a conse- <br /> <br /> <br />quence of urban growth, particularly since the catastrophic Big Thompson <br /> <br /> <br />River flood in the summer of 1976. Discussions regarding a wide ranging <br /> <br /> <br />study of the basin were initiated between the Omaha District Corps of <br /> <br /> <br />Engineers and local planners and elected officials in 1977 and a plan <br /> <br /> <br />of study was agreed upon. <br /> <br />. <br />