Laserfiche WebLink
Ms.Megan Gutwein <br /> August 16,2019 <br /> Page 11 of 25 <br /> The calculated transmissivities for the participating farms are shown in Table 8 below. <br /> Table 8 <br /> Resultant Transmissivities <br /> Hydraulic Conductivity Saturated Transmissivity <br /> Farm ( pd/sq-ft) Thickness (ft) ( pd/ft) <br /> Diamond A 3,611 20.8 75,000 <br /> Schweizer 3,611 20.8 75,111 <br /> Mameda 3,611 21.0 75,833 <br /> Groves 4,536 18.3 83,155 <br /> Mayhoffer 4,102 25.6 105,006 <br /> The distances from the drain or river, as appropriate, and the no-flow boundary to the centroid of <br /> irrigated areas are illustrated on Figures 22 through 26 included in Appendix A. The URFs were <br /> developed using the Integrated Decision System Alluvial Water Accounting System (IDS AWAS).The <br /> URFs are included in Appendix G. Per Section II.G, the time steps encompass 90% of the impact, <br /> and the URFs were normalized by apportioning the remaining return flows across the URF period. <br /> The estimated lagged historical return flows are illustrated in Table 24 of Appendices B through F <br /> and described in following sections of this report. <br /> B. Lagged Return Flows Deliveries <br /> Stored water derived from the Colorado Springs/Super Ditch Pilot Project, the supplies listed in <br /> Appendix H, and/or other fully consumable sources available to Colorado Springs, will be used to <br /> meet the lagged historical return flow obligations associated with the fallowing of the historically <br /> irrigated lands. Transit losses as assessed by Division 2 will be included from the point of release <br /> to the confluence of the Arkansas River and Crooked Arroyo. Lagged historical return flow releases <br /> will generally be made from Lake Meredith but may also be made from Pueblo Reservoir, or by <br /> utilizing Colorado Springs' fully reusable return flows available at the mouth of Fountain Creek. <br /> C. Depletion Credits for Operation Years <br /> Use of the LFT to model fallowing for each farm (as described above) beginning in March of the first <br /> year of operations, and average diversions, provides for an average historical consumptive use of <br /> 1,123.7 acre-feet(limited by the maximum 3 monthly amounts).Since lagged return flows after the <br /> irrigation season will be replaced by releases of water from storage, in an average year an additional <br /> 805.2 acre-feet of stream depletion credits from lagged return flows are available for exchange and <br /> municipal use by Colorado Springs (see Appendix I, Table 1.) The historical consumptive use and <br /> stream depletion credits provides for a total of 1,928.8 acre-feet of water available for exchange <br /> and use by Colorado Springs in an average year after deducting irrigation season lagged return flow <br /> replacements. However, exchanges to Colorado Springs will be limited to a historical consumptive <br /> use delivery of 1,000 acre-feet, plus the associated delayed return flow stream depletion credits, in <br /> any leasing year. <br /> Martin and Wood Water consultants,Inc. <br />