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<br />183\) <br /> <br />~, ,. <br /> <br />Table 7.4 Physical Characteristics of the FLCC System <br /> <br /> Reach 3 Reach 4 <br />1. Boundaries (Boyle Study) Pueblo Darn to John John Martin Darn to <br /> Martin Darn State Line <br />2. Ft. Lyon CC Share Locations: La Junta Division Limestone Division <br /> Horse Creek Division Lamar Division <br /> Las Animas Division" <br />3. Irrigated Land: (acres) 25,288 67,343 <br />4. Major Diversions (af/yr)b @ 33.8% @ 51.8% <br /> (allows for ditch <br /> losses in Reach 3) <br />5. Aquifer Priorities: <br /> Surficial Aquifers: <br /> Hydraulic conductivity (ft/day) 1200-1300 1300-1500 <br /> Specific yield 0.18 0.18 <br /> Valley fill properties": <br /> Hydraulic conductivity (ft/day) 670 670 <br /> Specific yield 0.20 0.20 <br /> <br />"A small portion of the Las Animas Division east of Hasty accrues return flows to Reach 4. <br /> <br />"Reach 3 is estimated contribution prior to export to Reach 4; Reach 4 is estimated contribution exported from Reach <br />3 after assessment of transit losses in Reach 3 (Table 3.6; Boyle 1990, Tables 3.10, 4.10) <br /> <br />'See discussion. USGS Report 91-4046. <br /> <br />Quantification and Fate of Return Flows <br /> <br />Due to the seasonal cycle of operations of the FLCC system, the vast majority of water diverted by <br />the FLCC enters the subsurface region during the irrigation season. Water balance analysis has <br />determined that this subsurface water is composed of deep percolation of irrigation water and <br />antecedent precipitation, seepage from the main canal and storage canal, and seepage from laterals. <br />When summarized, these waters are a percentage of diversions as stated in Table 7.1. They flow to <br />the surficial and Valley-fill aquifers underlying the sources of the waters and become part of the <br />complex storage and recharge system of the river. It has been estimated that 81 percent of the <br />FLCC irrigated lands are over the Valley-fill aquifer directly linked to the river. The other 19 <br />percent of the acres overlie surficial aquifers which discharge through the Valley fill to reach the <br />river. For waters that seep from the distribution system, 77 percent migrate, directly to the Valley <br />fill, while 18 percent goes to surficial aquifers first and five percent is lost permanently to <br />evaporation (Table A3.5). <br /> <br />7-25 <br />