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<br />. <br /> <br />nnn75'i <br /> <br />. <br /> <br />LDng-term precipitation variatiDn at Mesa Verde NatiDnal Park has been <br /> <br /> <br />studied Dn the basis Df tree-ring chronDlDgies fDr the periDd Df 740 A.D. tD the <br /> <br /> <br />present. The periDd Df 1905 thrDugh 19Z9 was cDnsidered tD be unusually mDist, <br /> <br />with normal tD sDmewhat dry cDnditiDns occurring thereafter. The 1951 thrDugh <br /> <br /> <br />1980 study period fell in a generally intermediate precipitatiDn range based <br /> <br /> <br />Dn the tree-ring studies and was neither unusually mDist nDr unusually dry. <br /> <br />. <br /> <br />. <br /> <br />City of l>uranRo Diversions <br /> <br /> <br />The City Df DurangD water supply is Dbtained frDm FlDrida River diversiDns <br /> <br /> <br />and municipal wells along the Animas River. Records Df FIDrida River diversiDns <br /> <br /> <br />are available fDr the period of 1971 thrDugh 1980. Measurement errors have <br /> <br /> <br />been made in the diversiDn recDrds accDrding tD the DurangD Water and Sewer <br /> <br /> <br />Master Plan Report, Sol the diversion recDrds prDvide Dnly a general estimate <br /> <br />Df municipal water usage. DiversiDns fDr the periDd Df 1951 through 1970 were <br /> <br /> <br />assumed tD be roughly prDportiDnal tD census population figures. A summary <br /> <br />Df pDpulatiDn and estimated diversiDns frDm the Florida River is provided belDw: <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br /> FIDrida R. <br /> DiversiDn <br />Year PopulatiDn (acre-feet) <br />1950 7,459 3,700 <br />1955 4,310 <br />1960 10,530 5,050 <br />1965 4,660 <br />1970 10,333 4,730 <br />1975 4,700 <br />1980 1l,4Z6 4,630 <br /> <br />Animas R. <br />DiversiDn <br />(acre-feet) <br /> <br />. <br /> <br />400 <br />350 <br />500 <br />600 <br /> <br />A listing Df estimated monthly diversions frDm the FIDrida River by <br />DurangD is presented in Appendix B. <br /> <br />. <br /> <br />. <br /> <br />Inigation Diversions in the Florida River Basin' <br />The State Engineer's staff has prepared a computer data file Df all irriga- <br />tiDn diversiDn recDrds in the FIDrida River basin. The periDd Df recDrd in the <br />data file includes the 1951 through 1980 study period. Summaries Df ditch diver- <br />siDn recDrds fDr the fDllDwing irrigatiDn ditches in the FIDrida River basin are <br /> <br />-8- <br /> <br />. <br /> <br />, -'-,~ <br />