Scientific Investigations Report 2007–5007
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5007
The four areas modeled with PRMS include about 3,667 mi2 (about 59 percent of the study area). Most of the upland areas in the basin, which produce more than 95 percent of the natural runoff (Mastin and Vaccaro, 2002a), are included in the upper Yakima, Naches, Yak Canyon, and ToppSatus areas (fig. 7 and table 1; also U.S. Geological Survey [1998]). The PRMS areas were divided into a total of 1,110 HRUs based on several factors (mean annual precipitation, elevation, soil properties, and left or right stream bank contributing area), and the HRUs vary in size and shape (Mastin and Vaccaro, 2002a).
Fourteen DPM models were constructed to calculate predevelopment recharge, principally in the areas not included in the PRMS models. The 14 areas (fig. 7) include about 2,554 mi2, and were subdivided into a total of 74,978 square HRUs (table 1). Note that because of the irregular-shaped boundaries for the modeled areas, the HRUs at the boundaries are not complete squares. Thirteen of these areas also were modeled using DPM to estimate current-condition recharge. In addition, as described above, two other areas with extensive irrigated agriculture and development included in the PRMS models were modeled using DPM (Wenas and Cle Elum, fig. 8, table 1). One predevelopment area (Kittitas, fig. 7 and table 1) was further refined (Ellensburg, fig. 8 and table 1) to include mainly irrigated croplands and cities for estimating recharge for current conditions. The 16 current-condition models have a total of 80,130 HRUs and include an area of 2,438 mi2. The weather information for input to the DPM models was obtained from the weather sites shown on figure 5.
U.S.
Department of the Interior | U.S. Geological
Survey
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