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<br />0016J5 <br /> <br />3&.1--7 <br /> <br />WATER INFORMATION MANAGEMENT SYSTEM HANDBOOK <br /> <br />Step 8 - Using the area, elevation or characteristics data produced in <br />step 4 and the relations developed in steps 5 and 7, .QB is calculated <br />for the point(s) of quantification (Gold Creek): <br /> <br />DA = 42.4 mi2 <br />E = 9.6 (thousands of <br />feet) <br /> <br />WB . 227.8DAO.52E-l.89 <br />a 227.8(42.4)0.52(9.6)-1.89 <br />= 22.2 ft <br /> <br />QB = 6.53WA.07 <br />= 6.53(22.2)1.07 <br />= 180.1 cfs <br /> <br />Step 9 - Proceed to Common Step 1 sec. 36.2, appendix B. <br /> <br />Example - Method D. In this example it is assumed that a request for <br />lnformatlon has been made by a Congressional Committee. The request seeks <br />an. approximate figure for total National Forest System channel maintenance <br />flow requirements within Region 7. The hydrologist for the Many Creeks <br />National Forest receives the request in mid-winter and is asked to respond <br />within two weeks. <br /> <br />Researching available data, a small number of gaging stations are found <br />within or near the National Forest boundaries. A few additional stations <br />are identified at some distance from the National Forest boundaries but <br />within a locale having the same hydrophysiographic characteristics. <br /> <br />Considering the time frame, the time of year and the purpose of the <br />quantification the hydrologist concludes that the analysis must be <br />completed without the benefit of field data. Further, because of the need <br />to protect stream reaches potentially suseptible to loss of flow, and the <br />purpose of the quantification, it is also decided that all channels would <br />be assumed to be capable of adjustment to frequent flows. <br /> <br />The hydrologist's approach to the project is as follows: <br /> <br />1. The method of choice is Method D. <br /> <br />2. All stations on or within National Forest boundaries would be <br />used as representative, assuming no significant regulation effects (only <br />Gander Creek will be used for illustrative purposes). <br /> <br />3. Streams to be quantified would be associated with representative <br />stations on the basis of proximity as modified by considerations of major <br />drainage divides, elevation, and similar factors. <br /> <br />ID NO.3 <br />8/28/87 <br />