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. . . Irrie;ation dovelopment began in 1933 uhen the first irrigation ;lell W1S drilled in tho Te~:lino area. Development progressed rather slowly for the noxt 10 years, a vGrazing abeut 2 wells per year. The period of . greatest devolopmont eccurred in 1944, 1945, and 1946, when 50 of the nresent 90 wells were drilled. Only 10 lIells wore drillod during the i947-50 period, 1Q/ 'vIa tel' SuP.!21x The uater ;Ihich is used for irrigation in the aren occurs in the sands and gravels of the Ogallo.la formution of the Tortinry ago, uhich covers most of the surfnce of the plains and rosts on an uneven floor of the older rocks. This fe~~tion ranges in thick- ness from 0. fell feet to severnl hlmdred feet nnd has nn average thicknoss in this aren of from 100 to 150 feot, lJI The water supply in this nren is o.mple for present needs nnd is of good quality for domestic and irrigation use, Project Horks Wells drilled during the enrly years of development hnve been replnced with modern equipment. Most ',lolls now in use are cased lIith 18- to 24-inch, butt weldod, stove-pipe type cnsing with nn nverngo perforntien lenGth of 50 feet. Drilled depths range from 75 to 175 feot. 2i1/ Seme of tho earlier wells used centrifUco.l-type pwrrps but these have been replaced. All wells are now equipped ;Ii th "deep-wall turbine pUlllpS" which O.l'e sot o.t o.n nverage depth of 110 feot. Pumps are powered mainly by automotive-type engines adapted for stationn1J( uso or eloctric motors. Industrinl type engines nre used on some of the deeper ;lells out- side the principal arens of pumping. The engines nre fueled ;lith gnsoline or butane, ;Ii th go.solino supplying 0. maj ori ty of the engines. Vlithin the centers of development the pumpin[; levels range from 50 to 100 feet, nveraging nbout 85 feot. Dralldown rangos from 20 to 50 feet, averaging 36 feet in the principal areas of pUlllping. The nverage well yield for the aren approximu tes 800 gallons per minute. Al though indi viduo.l well yields rnnge from 400 to 1,200 gallons per minute, the majority of wells have yields similar to the average of GOO g. p. m. Z1I Irrigc.tion requirements have beon estimatod at 30 inches for alfalfa and 1;2 inches for other crops, about tho sm'e as those of irrigated lands of tho Tems Hig!' Plains. 22/ 1Y 19.1 3Q/ W W Martin, Stephen D, "Irrignted Areas in Dallnm Count;i". Land Baru: of Houston. Jan. 1, 1950. Ibid. Mnrtin, Stephen D. "Irrigated Arens in Dnllllm County". Ibid. Ibid. Foderal Gp. cit. 2,3