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Data for each land use variable, such as numbers of dwelling units, employees, etc. is <br />required for each TAZ. This data is required for the base year calibration as well as for <br />each forecast scenario. When this was not available, various procedures were used to <br />derive this data. <br />Summary of the Procedures for Compiling Kittitas County Land Use <br />The Kittitas County land use data was updated using data from multiple sources for <br />both the base year and the forecast scenarios. The transportation model requires not <br />only numbers of dwelling units but also levels of employment, as measured by floor <br />area, by type of employment and can also include other types of land use not <br />specifically related to dwelling units or employment. <br />Internal Zone Data <br />The residential land use was further divided into residential categories for Upper <br />County, Lower County, and Range to allow for more accurate trip generation. Much of <br />the residential in the Upper County is vacation or recreational property and hence has a <br />lower average trip generation rate. The Agriculture/Forestry/Mining classification was <br />also divided to differentiate by trip generation as well. Typically irrigated agriculture <br />has higher trip generation than range land. <br />The Upper County area is typically the part of Kittitas County that is West and North of <br />Ellensburg. The area included in the U . r Co un <br />Kittitas County, Washington Trans portation Model-May 2009 Page24