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<br />001226 <br /> <br />(h) Ground ~ - 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 materials, <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. Confined Ground Water- 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 Water - Saturated material consisting <br /> <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 />elevations in excess of 14,000 feet. The river flows in a general ~outh- <br />easterly direction through mountainous areas to Canon City. Downstream <br />from Canon City it meanders through the plains to the Kansas state line. <br />Most of the dependable runoff in the basin is from snowmelt in the mountains <br />upstream from Canon City. Flood flows generally originate from high <br />intensity rainstorms in the plains tributaries and are not dependable for <br />supplying irrigation requirements. <br />Irrigation in the Arkansas River basin of Colorado began in the early <br />1860's by small individual enterprises. By the early 1900's all the <br />dependable surface flows had been appropriated for direct use and/or <br />storage. Snow melt runoff normally diminishe, rapidly in July, after which <br />the lands under a majority of the canals suffer moderate to severe shortages. <br />The variability of the flow at Canon City vs. the average monthly <br />canal water supply requirements is as shown in the following table: <br /> <br />8 <br /> <br />