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<br />00lGD3 <br /> <br />36.1--5 <br /> <br />WATER INFDRMATION MANAGEMENT SYSTEM HANOBOOK <br /> <br />Step 6 - Bankfull channel top width is measured at the pOint(s) of <br />quantification (Gold Creek in this example), and usin9 the relation of <br />step 5, bankfull discharge is calculated: <br /> <br />QB = 6.53W~.07 <br />= 6.53(24.1)1.D7 <br />= 196.6 cfs <br /> <br />WB ~ 24.1 ft <br /> <br />Step 8 - Proceed to Common Step 1, sec. 36.2, appendix B. <br /> <br />Example - Method C. In this example it is assumed that a basin-wide <br />planning effort has been undertaken for long-range water development <br />planning. The effort has been initiated and largely carried out by <br />another agency. As a result of interagency exchanges of information it <br />becomes evident that USDA Forest Service requirements for channel <br />maintenance flows should be considered along with state and federal <br />fisheries flow requirements. The analysis is being carried out at a <br />fairly high level of resolution. However, due to various constraints the <br />hydrologist is asked to produce reasonable estimates of required flows <br />within a period of four to six weeks with the request being made in late <br />summer. <br /> <br />There are a large number of drainages requiring quantification and study <br />of aerial photographs and maps indicates numerous difficulties of access. <br />This research also indicates the presence of several gaging stations which <br />prove to be representative of proportionate segments of the area under <br />study. A few additional stations are identified as being acceptable for <br />use as suitable stations. <br /> <br />After considering the purpose of the quantification, the limited time <br />frame, the lateness of the field season, and the access difficulties the <br />hydrologist determines that the analysis should be made using mostly <br />existing data. Since few if any sites will be visited it is assumed that, <br />in light of the "weak link" principle and as a practical matter, all <br />drainages have mobile beds and/or banks. <br /> <br />The hydrologist's approach to this project is as follows: <br /> <br />1. The method of choice is Method C. <br /> <br />2. Several stations are identified as each being representative for <br />several points of quantification (only Gander Creek will be used for <br />illustrative purposes). <br /> <br />3. All of the stations listed in exhibit 1, rows a-I are suitable <br />stations. <br /> <br />ID No.3 <br />8/28/87 <br />