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<br />1960s while the Lower Arkansas (LAR) shared the 1950s but not the 1960s. The wet period <br /> <br /> <br />since 1980 is not as wet as the period for 1905-1930. <br /> <br />The correlation of the precipitation for the water year (October through September) and <br /> <br /> <br />the 12 month SPI between the regions is shown in Table 6 and Table 7. These show clearly that <br /> <br /> <br />the precipitation is more highly correlated with neighboring regions in western and eastern <br /> <br /> <br />Colorado and not well correlated from west to east. The Rio Grande region is better correlated <br /> <br /> <br />with the San Juan, Animas and Dolores (SA) and Gunnison (GU) but not as well correlated as the <br /> <br /> <br />western or eastern regions are with each other. These correlations also indicate that wet and dry <br /> <br /> <br />will have a spatial variation in Colorado so the periods identified in the previous tables are <br /> <br />generally applicable but individual years will have differences. <br /> <br />The regional history of summer (April-September) and winter (October-March) <br /> <br /> <br />precipitation is given in Figure 9 and 10. Correlation of summer and winter precipitation among <br /> <br /> <br />the regions is presented in Tables 8 and 9. These graphs and tables show similar patterns to the <br /> <br /> <br />water year and 12 month SPI ones before. Regions are correlated best with those nearby much <br /> <br /> <br />less with those on the opposite side of the mountain ranges. In a similar way the occurrence of <br /> <br /> <br />dry and wet periods is related but not exactly the same. <br /> <br />The worst dry and wet periods for each location are given in Appendix E. These tables <br /> <br />contain the dry and wet periods for all time scales for the largest and next to largest magnitude of <br /> <br />drought with the associated start and end dates and the duration of the event. Magnitudes of dry <br /> <br />or wet events have been averaged over the stations in each drainage basin for each time scale and <br /> <br />are presented in Table 10. In Table 10 the magnitudes are the largest accumulated precipitation <br /> <br />deficit (dry) or surplus (wet) in fraction of the annual precipitation averaged over the drainage <br /> <br />21 <br />