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<br />O~1953 <br /> <br />(h) Ground Water - Ground water is all water that occurs beneath <br /> <br /> <br />the surface of the earth within the zone of saturation. <br /> <br /> <br />1. Unconfined Ground Water - Water within saturated materiais. <br /> <br /> <br />the upper surface of which is unrestricted with respect <br /> <br /> <br />to vertical fluctuations of the water table. <br /> <br /> <br />2. CJnfined Ground ~- Water within saturated materials. <br /> <br /> <br />which is confined by overlying relatively impervious <br /> <br />material. It has a pressure greater than atmospheric. <br /> <br /> <br />). Alluvial Ground ~ - Saturated material consisting <br /> <br />of unconsolidated sand and gravel stream deposits. <br /> <br />SUMMARY <br /> <br />The headwaters of the Arkansas River originate above Leadville at <br /> <br /> <br />elevations in excesS of 14,000 feet. The river flows in a general ~outh- <br /> <br /> <br />easterly direction through mountainous areas to Canon City. Downstream <br /> <br /> <br />from Canon City it meanders through the plains to the Kansas state line. <br /> <br />Host of the dependable runoff in the basin is from snowmelt in the mountains <br /> <br /> <br />upstream from Canon City. Flood flows generally originate from high <br /> <br /> <br />intensity rainstorms in the plains tributaries and are not dependable for <br /> <br /> <br />suoplying irrigation requirements. <br /> <br />Irrigation in the Arkansas River basin of Colorado began in the early <br /> <br />1860's by small individual enterprises. By the early 1900's all the <br /> <br /> <br />dependable surface flows had been appropriated for direct use and/or <br /> <br /> <br />storage. Snow melt runoff normally diminishe. rapidly in July, after which <br /> <br /> <br />the lands under a majority of the canals suffer moderate to severe shortages. <br /> <br /> <br />The variabil ity of the flow at Canon City vs. the average monthly <br /> <br /> <br />canal water supply requirements is as shown in the following table: <br /> <br />8 <br />