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^^ Introduction Purpose and scope _^ Streamflow gaging network 2 Low flow analysis Predevelopment discharge from the High Plains aquifer 8 Rattlesnake Creek _ Ninnescah River tributaries 17 Medicine Lodge River 19 Chikaskia River Cimarron River and tributaries west of 99° longitude 20 Beaver River and tributaries above Wolf Creek 22 Wolf Creek Summary _ References cited 27 FIGURES 1. Map showing location of study area 3 2. Graph showing average monthly precipitation for the Oklahoma panhandle (Oklahoma Climate Division 1) from 1961 through 1990 4 3. Map showing streamflow stations used in the analysis of discharge from the High Plains aquifer 7 4.-5. Graphs showing: 4. Frequency curves for 7-, 14-, and 30-day December-February low flows for Beaver River near Guymon, Oklahoma, (station 07232500) for winters of 1937-38 through 1974-75 ^ 5. December-February low flows for 7-, 14-, and 30-days for the Beaver River near Guymon, Oklahoma, (station 07232500) for winters of 1959-60 through 1992-93. Left bar is 7-day low flow, middle bar is 14-day low flow, and right bar is 30-day low flow 16 6. Diagram showing predevelopment discharge from the High Plains aquifer to streams 18 7. Graph showing December-February low flows for 7-, 14-, and 30-days for the Beaver River near Guymon, Oklahoma, (station 07232500) for winters of 1937-38 through 1974-75. Left bar is 7-day low flow, middle bar is 14-day low flow, and right bar is 30-day low flow 23 TABLES 1. Streamflow stations used in the analysis of predevelopment discharge from the High Plains aquifer 6 2. Streamflow stations with December-February low-flow analysis and estimated predevelopment discharge from the High Plains aquifer 11

Estimated predevelopment discharge to streams from the High Plains Aquifer in northwestern Oklahoma, southwestern Kansas, and northwestern Texas