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Table 4: CMPDSI Reg Tonal Basin Description . Region I Basin /Desciption ARKANSAS DRAINAGE 1 Plateau South of Valle 2 Valley Bottom 3 North of Valle 4 Mesas 5 Foothills 61 Collegiate Valle 71 Upper Valley KANSAS DRAINAGE 81 South Plains 91 North Plains PLATTE DRAINAGE 10 Lower Plains 11 North Front Range 12 South Front Range 13 Pikes Peak 14 Front Range Foothills 151 South Park 161 North Park RIO GRANDE DRAINAGE 171 San Luis Valley COLORADO DRAINAGE 18 Lower Valle s 19 San Juan, Dolores, Animas 20 Yampa-White 21 Upper Gunnison 22 Upper Valle 23 San Juans 24 Central Mountains 25 Northern Mountains The procedure for calculating the CMPDSI is the same method as described by Palmer (1965), it is only the regions that are being calculated that were modified. Please refer to Palmer (1965) for a complete description of how the index is calculated. Current Work As part of the Colorado Water Conservation Board Update to the State Drought Mitigation and Response Plan, the data inputs for these indices have been updated. Previously, the indices used the base period 1961- 1980. In an effort to update the index calculations, station lists were updated to remove discontinued stations and add in new stations that have come online with at least 25 years of data. Once the station lists were updated, new station averages were created for the period 1980 — 2009 for both temperature and precipitation. From these station averages, new regional averages for the CMPDSI were calculated. Additionally, for the CMPDSI new water balance coefficients (see Table 2) were calculated using the new base period.