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SPDSS Task 58 Memo <br />August 5, 2004 <br />Page 13 of 22 <br />Colorado AGricultural Meteorological nETwork - COAGMET <br />COAGMET is a network of over 20 weather stations located in the SPDSS study area and the <br />Republican River Basin that are used to calculate crop evapotranspiration. The COAGMET <br />outputs provide reference (ETref) and daily ET values for nine potential crops. ET values <br />provided in COAGMET outputs are computed using an Alfalfa reference equation (1982 <br />Kimberly Penman). Historical climate and reference ET values are available from the site <br />http://ccc.atmos.colostate.edu/~coagmet . <br />Denver Water Network <br />Denver Water has four weather stations located around the metro area that they use to develop <br />ET estimates for lawn grass. Climate data and associated ET estimates (ETo) are contained on <br />the Denver Water web page at www.denverwater.orb/reslevelsmore/reslevelsmoreframe.html. <br />Data is only available in electronic form starting in 2003 (Denver Water staff did not know <br />whether previously collected data exists). <br />6. Computer Models for Potential Consumptive Use Estimates <br />The following is not intended as an exhaustive list of computer programs used to calculate PCU <br />in Colorado, but lists several of the more popular programs for calculating PCU available to the <br />public. A number of consultants use programs developed for internal use in those companies. <br />StateC',TT <br />Part of the State's CDSS, this consumptive use program will be enhanced as part of the South <br />Platte Decision Support System. StateCU can be used statewide and is the official consumptive <br />use model of the Division of Water Resources and the Colorado Water Conservation Board. <br />This CDSS model/data system has been applied in Colorado by consultants and State <br />representatives. An example of its application was its use by the SEO to develop consumptive <br />use estimates (modified Blaney-Criddle method) at 30 climate stations for the time period of <br />1950-2000 which were subsequently provided to managers and staff for the Designated Ground <br />Water Basins. Another example of StateCU use is the previously referred to annual <br />determinations made for the Upper Gunnison Water Conservancy District's of consumptive uses <br />above the Aspinall Unit. The latest released version of this model is available from <br />http://cdss.state.co.us/ftp/cu.asp. <br />SPMAP/IDSCU <br />This consumptive use toolbox, initially with a similar calculation foundation to the CDSS's <br />StateCU program, was developed as part of the South Platte Mapping and Analysis Program <br />(SPMAP), a collaborative effort between IDS and water users in the South Platte. IDSCU can <br />compute monthly CU using the Blaney-Criddle, calibrated Blaney-Criddle, Pochop, or <br />Hargreaves methods. The daily Kimberly-Penman, Penman-Monteith, and ASCE Standardized <br />Penman-Monteith methods are also available. The model integrates into the groundwater <br />