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<br />001598 <br /> <br />36 <br /> <br />WATER INFORMATION MANAGEMENT SYSTEM HANDBOOK <br /> <br />36 - APPENDICES. <br /> <br />36.1 - Appendix A - Examples of Individual Methods Calculations For <br />Required Maintenance Flows. <br /> <br />The following examples are presented for purposes of illustration only. No <br />attempt has been made to assure the validity of any statistical results. <br />It is the user's responsibility to ascertain the statistical significance <br />of all calculated relationships. <br /> <br />Example - Method A. In this example we shall assume that a proposal has <br />been made in early summer to withdraw water by that winter from Gold Creek <br />for the purpose of snowmaking. .Further, the proponent has also indicated <br />similar intentions for future withdrawls from several other drainages all <br />of which, including Gold Creek, are located on National Forest system <br />lands. In the evaluation of the special use application for the <br />construction of diversion works in Gold Creek, a question arises as to the <br />amount of flow needed for channel maintenance. <br /> <br />An examination of available information reveals that nearby Gander Creek, a <br />USDI Geological Survey gaged drainage, is hydrologically similar to Gold <br />Creek and the other identified drainages of interest. Further, several <br />additional gaged stations, while not as similar as Gander Creek, are <br />reasonably similar to Gold Creek in terms of precipitation and regulation. <br /> <br />The purpose of the quantification, the accessibility of the sites, and the <br />adequacy of available time and workforce resources indicate the suitability <br />of an intensive approach. Furthermore, aerial photographs indicate that <br />Gold Creek, the point of quantification, is characterized by a channel <br />which can adjust its boundaries in response to frequent flows. <br /> <br />The hydrologist's approach to the project is as follows: <br /> <br />1. The method of choice is Method A. <br /> <br />2. The representative station is Gander Creek. <br /> <br />3. The stations listed in exhibit 1, rows a-I will be the suitable <br />stations. <br /> <br />4. The relationship which will be developed will be used on the <br />additional diversion proposals when offered by the proponent. <br /> <br />5. Bankfull discharge stage and water surface slope will be <br />determined USing bankfull indicators. (This is necessary because bankfull <br />discharge has already occurred and the project proposal requires a decision <br />before the next anticipated occurrence of this flow.) <br />