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<br />001601 <br /> <br />36.1--3 <br /> <br />WATER INFORMATION MANAGEMENT SYSTEM HANDBOOK <br /> <br />Step 4 - The values of QB developed in steps 2 and 3 and their <br />corresponding bankfull cross-section areas and water surface slopes (ex. <br />1, columns 5, 6, and 7), are used to develop a regression equation: <br /> <br />QB = 5.48AS.17S0.21 <br /> <br />Step 5 - At the point of quantification bankfull channel cross-section <br />area and water surface slope are measured and applied to the relation <br />developed in step 4. <br /> <br />AB = 50.6 ft2 <br />s = 0.0062 <br /> <br />QB = 5.48Aa.17S0.2l <br />= 5.48(50.6)1.17(0.D062)0.2l <br />= 185.8 cfs <br /> <br />Step 7 - Proceed to Common Step 1, sec. 36.2, appendix B. <br /> <br />Example - Method B. For this example let us assume that the hydrologist <br />has been informed that the United States has been jOined in a basin-wide <br />adjudication of water rights in a basin which includes a small amount of <br />National Forest System lands. A request for a quantification of the flows <br />"necessary to secure a favorable condition of water flows" has been <br />received and the time is mid-summer. Further, the request indicates the <br />required flow calculation must be completed by late fall. <br /> <br />Examination of maps and photos reveals th~t the number and location of the <br />needed points of quantification are such that limited field data <br />collection at each site is feasable within time and resources <br />constraints. Photos and local knowledge also reveal that all channels <br />warrant treatment as having adjustable beds and/or banks. <br /> <br />Additional research results in a listing of USDI Geological Survey gaging <br />stations which are on drainages similar to the ones requiring <br />quantification. From this list, several gaging stations appear <br />appropriate for use as representative stations for selected points of <br />quantification. <br /> <br />The hydrologist's approach to this project is as follows: <br /> <br /> <br />1. The method of choice is method B. <br /> <br />2. Several representative stations are identified (only Gander Creek <br />will be used for illustrative purposes). <br /> <br />ID No. 3 <br />8/28/87 <br />