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C'::) c-' "" c.n '" 00 Table I Groundwater Supplies Used For Irrigation in 1975 in Problem Area 2 in New Mexioo Coun ty Harding Quay Union 1000 Acres Irrigated 4.4 12.5 39.5 Feet Depletion 5.1 18.4 52.3 1000 Acre Withdrawals 9.3 34.9 94.8 OKLAHOMA Problem Area 1, High Plains Groundwater Irrigation, ASA's 1103, 1105, and 1106. The main portion of the Ogallala found in the Panhandle area of Oklahoma lies in the counties of Cimarron, Texas, Beaver and Ellis. Traces Can also be found in Harper, Woodward and Roger Mills Counties. For this report, available sources of informa- tion will limit the discussion of the problem area to the panhandle counties of Cimarron, Texas and Beaver. The Oklahoma Panhandle is included in an area termed the High Plains or Llano Estacado. Generally the area slopes to the east with the highest point being the Black Mesa <elevation 4,973 feet) and the lowest point on the Cimarron River in eastern Beaver County <elevation 2,000 feet). The region is poorly drained with approxi- mately 90 percent uplands, 5 percent slopes and 5 percent lowlands. Soils of the area are as follows: Association Mansker-Berthoud-Potter Richfield-Dalhart-Ulysaes Vona-Dalhart-Tivoli Travesilla-Berthoud-Potter Pratt-Otero-Tivoli Spur-Lincoln-Las Animas Square Miles 1,941 2,428 580 392 216 304 Percent of Area 33.1 41.4 9.9 6.7 3.7 5.2 Total 5,861 100.0 The climate is classified 8S semiarid with annual precipitation ranging from 17 inches in the west to 20 inches in the east. Annual snowfall ranges from 14 to 16 inches yearly. o The mean annual temperature is 57 with the mean daily maximum o 0 varying from 57 in January to ~5 in July and August. The average length of the growing season varies from 170 to 183 days. Evaporation on lakes average 62 to 64 inches per year with average wind speeds of 14 miles per hour. 108