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<br />OOlG92 <br /> <br />36.1--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 />( <br /> <br />WB - 227.8DAO.52E-l.89 <br />_ 227.8(42.4)0.52(9.6)-1.89 <br />- 22.2 ft <br /> <br />QB - 6.53W~.07 <br />_ 6.53(~2.2)1.07 <br />- lSO.1 cfs <br /> <br />Step g - Proceed to Common Step 1 sec. 36.2, appendix B. <br /> <br />EX~le - Method D. In this example it is assumed that a request for <br />in ormation 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 suseptib1e 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. 1 <br />9/10/85 <br />