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Phase 1c Model Input Files <br />Phase lc development of the Rio Grande Surface Water Model included refinement of many of <br />the input files developed during Phase la and Phase lb efforts. The majority of these input files <br />were created using Data Management Interfaces (watright, demandts, tstool, makenet, makertn) <br />by executing command files. These command files differ from those used to create the Phase lb <br />model in that they reflect the use of groundwater wells. Development of specific files to <br />represent groundwater use are discussed below. <br />Well Stations <br />Groundwater in the San Luis Valley serves both as a supplemental supply to many surface ditch <br />systems and as a sole supply to other irrigated lands. In cases where groundwater serves as a <br />supplemental supply, ditch systems are represented as type "D&W" nodes in the surface water <br />model, i.e. they receive water from a surface ditch and from groundwater wells. D&W nodes <br />were identified by examining well-to-structure (WDID) relationships specified in HydroBase, <br />which have been determined through efforts of the Consumptive Use and Spatial Database <br />contractors on the RGDSS project. <br />In addition to the one hundred and eighty-three (183) DIV nodes in the surface water model <br />(surface supplies only), there are two hundred and fifty (250) D&W nodes specified. Physical <br />characteristics of the D&W nodes are found in both the direct diversion station (*.dds) and well <br />station (*.wes) files. Water rights associated with D&W nodes are found in the direct water <br />rights (*.ddr) and the well water rights (*.wer) files. <br />By contrast, lands that are served by groundwater only are specified in the surface water model as <br />type "WEL" nodes. WEL nodes represent one or more irrigated parcels in the Valley that have <br />no identified surface water source. These lands were identified by the Spatial Database <br />Contractor. Grouping of these lands was then made based on geographic location and to be <br />consistent with previously defined Unit Response Zones (URFs) identified by the Groundwater <br />Contractor. <br />Sixty-eight (68) WEL nodes are specified in the surface water model. The naming convention for <br />these nodes indicates the Water District and URF zone in which they are located. For example, <br />node 20URF73 is located in Water District 20 and URF zone 73. WEL nodes with names <br />indicating URF zone "0" lie outside of the groundwater model domain where URFs have been <br />developed. <br />Well Water Rights <br />Well water rights (permits) for both D&W and WEL nodes were obtained from the State's <br />database, HydroBase. These include decreed water rights and permits for large capacity (greater <br />than 50 gpm) wells only. As described in a memorandum by the GIS contractor (Wellfile <br />Analysis Program Documentation, January 5, 2000) the derived well table that was used by the <br />surface water model includes a detailed process to merge well permits and well water rights in <br />order to identify unique wells and avoid double accounting. For a given D&W or WEL node, the <br />well water rights (permits) were then aggregated into 8 water right classes using the DMI <br />watright and the command -aggregate_wel_rights. The aggregation of well water rights <br />(permits) is appropriate because of the large number of wells associated with some surface <br />structures (>1,000 wells), and because they generally have a very junior priority when compared <br />to surface water rights. In addition, the creation of water right classes greatly reduces the <br />computational time when running StateMod. The aggregations are performed using the same <br />C:Acdss\Task8-8.doc Phase lc Model September 27, 2000 -Page 2 of 17 <br />