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• 7 <br />2.2 Adjacent Area Surface Water Information [2.04.7(2)(x)] <br />Ae stated earlier, Magpie Creek floes into Newlin Creek just belw the study <br />area and Newlin Creek flows into Hardserabble Creek approximately five miles <br />below the study site. Hardserabble Creek has much tha same characteristics as <br />1 <br />Newlin and Magpie Creeks. Hardacrabble Creak is an ephemeral stream and also <br />r <br />originates in the Wet Mountains. The adjacent area boundary as defined in <br />Section 1.2 is shown on the Hydrology Hap 1 (Appendix A). No springs, lakes, <br />• or ponds exist within the defined adjacent boundary. When runoff is produced <br />C by a thunderstorm, the major body of water to eventually receive discharges from <br />the study area is the Arkansas River, which is not within the adjacent boundary. <br />r <br />2.3 Seasonal Variation in Water Quantity (2.04.7(2)(b)(i)] <br />• Both streams being studied are ephemeral with abase flow of zero. The <br />seasonal variation ranges from zero to the quantities of runoff produced by snw- <br />melt end thunderstorms with various intensities and durations. The drainages <br />• being studied are ungauged and no recorded data exists. Thus, methods developed <br />for estimating runoff for ungauged basins and methods pertaining to estimating <br />the runoff for a general area of which our study area is a part, are used to <br />estimate the runoff from various return-frequency events. An important eonsid- <br />oration for mountainous regions is the runoff produced by snowmelt. Estimates <br />of runoff produced by snawmelt and thunderstorms are presented in the following <br />subsections. The return frequencies selected are based on the Stste design re- <br />quirements for the various drainage and sediment control structures used by <br />G.E.C. Minerals, Inc. The return frequencies selected are the 2-, 10-, 25-, <br />and 100-year events. The duration used for each event was 24 hours. <br />• <br />