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Ms.Megan Gutwein <br /> August 16,2019 <br /> Page 5 of 25 <br /> Other factors used in the historical use analyses are as follows: <br /> Ditch Loss - 10.4309% per HI Model <br /> Off-Farm Lateral Losses - 3.5% per HI Model <br /> The Criteria and Guidelines also require the use of the Modified Blaney-Criddle with TR-21 crop <br /> coefficients, use of the weather station nearest to the headgate, 30 years of diversion records, <br /> cropping patterns based on county cropping records, use of the USBR effective precipitation <br /> method, and an aerial photograph from each decade used in the analysis.The LFT provides for the <br /> first five criteria, with the study period for the Participating Farms consisting of the most recent <br /> period from which diversion records are available (1988 through 2017). Note that the LFT <br /> designates the Rocky Ford 2 SE weather station as that nearest the headgate, and that the <br /> diversion records therein include only deliveries of native and winter water. It is our understanding <br /> that the county cropping patterns used in the model are peer reviewed on an annual basis by <br /> personnel from both Kansas and Colorado. <br /> C. Historically Irrigated Acreage <br /> CDSS mapping was reviewed to develop irrigated acreage for the Participating Farms (Division 2 <br /> Irrigated Lands Shapefiles5). Aerial photographs for all of the Participating Farms obtained for the <br /> years 1988, 1998, 2005 and 2011 are included in Appendix A as Figures 2 through 21. No notable <br /> discrepancies were found between CDSS mapping and our aerial photograph delineations. The <br /> irrigated acreages identified on the aerial photographs are reported in Table 3 below. <br /> s Available at https://www.colorado.gov/pacific/cdss/division-2-arkansas <br /> Martin and Wood Water Consultants,Inc. <br />