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purposes; 487 shares of LAWMA common stock are used for commercial purposes; 150 shares of <br />LAWMA preferred stock are used for agriculturaUirrigation purposes. T'here are currently 18,934 <br />shares of LAWMA common stock outstanding and 150 shares of LAWMA preferred stock <br />outstanding. <br />Far its 2007 Arkansas River Use Rules replacement plan ("replacement plan"), LAWMA <br />included 485 wells, of which 410 are located in the Arkansas River's mainstem area and 75 are <br />located in tributary areas. Further broken-down by use, there are 441 irrigation wells, 31 municipal <br />wells and 13 commercial wells. LAWMA's plan for augmentation decreed in Case No. 02CW 181 <br />("plan for augmentation") includes 214 wells, 8 gravel pits, 3 wildlife ponds and 1 spring. <br />LAWMA's primary service area is the Arkansas River mainstem below John Martin Reservoir, <br />although it has members in the Big Sandy Creek and Two Butte Creek basins and a few members <br />above John Martin Reservoir. LAWMA membership also includes several municipal and rural <br />domestic water suppliers that rely on Dakota and Cheyenne aquifer wells which are considered non- <br />tributary and are not subject to the Arkansas River Use Rules. <br />III. Replacement Water Requirements <br />LAWMA's replacement water requirements are annually determined in its replacement plan <br />and in its plan for augmentation using an accounting model of the Arkansas River basin developed <br />by the State Engineer's office. The model is broken down into 18 segments between Pueblo Dam <br />and the State line. Well pumpage and other water usage by LAWMA members affects only the <br />lower 9 segments of the State Engineer's model which represent the area from the Las Animas <br />Consolidated Canal above John Martin Reservoir to the State line. The stream segments can be <br />logically reduced to (1) the segment between the Las Animas Consolidated Canal headgate and John <br />Martin Dam, (2) the segtnent between John Martin Dam and the Lamar Canal headgate, (3) the <br />drainage ditches and small creeks which contribute water to the Amity Canal, (4) the segment <br />between the Lamar Canal and Buffalo Canal headgates, and (5) the segment between the Buffalo <br />Canal headgate and the State line. Figure 1 is a schematic drawing of the Arkansas River from La <br />Junta to the State line and shows these features as well as others. <br />Pursuant to the State Engineer's Arkansas River Use Rules, a presumptive depletion factor <br />is assigned to each irrigation well included in LAWMA's replacement plan based on whether the <br />well supplements ditch deliveries of surface water or provides a full supply of water for the owner's <br />fields. For LAWMA's 2007 replacement plan wells providing supplemental supplies are assigned <br />a 39% depletion factor, and wells providing the full supply are assigned a 50% or 75% depletion <br />factor for flood irrigation methods and sprinklers, respectively. Cunently, LAWMA's irrigation <br />members in the mainstem area that are covered by its replacement plan include 223 supplemental <br />wells,149 sole-source wells, and 47 wells which are used as part of a compound or complex system. <br />For LAWMA's plan for augmentation, depletion factors are set forth in the plan for augmentarion <br />and are assigned to each well or structure based on the type of water use involved. <br />2 <br />