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<br />OOlG62 <br /> <br />31.11 <br /> <br />WATER INFORMATION MANAGEMENT SYSTEM HANDBOOK <br /> <br />3. Program A193 calculates log-Pearson type III statistics and <br />frequency distribution for high and low-flow discharges for each of the <br />consecutive day periods mentioned above. <br /> <br />i <br />\ <br />, <br /> <br />4. Program K609 (DVSUMR) produces a summary table of the average <br />daily mean discharges for the period of record. <br /> <br />5. Program J407 (PKWRCA) is used for annual peak flow log-Pearson <br />type III frequency analysis following Water Resources Council guidelines in <br />Bulletin 17-B. The output from this program includes a listing by year of <br />the annual peak flows for the period of record, computed peak discharges at <br />selected exceedance probabilities with the corresponding 95 percent <br />confidence limits, and a plot of annual peak magnitudes vs. annual <br />exceedance probabilities. <br /> <br />6. Program E796 is used to retrieve selected data from the <br />streamflow/basin characteristics file. Specified characteristics can be. <br />selected from a list of nearly 200 parameters including drainage area, mean <br />basin elevation, climatic variables, and streamflow characteristics. <br /> <br />7. Discharge Measurement Summary Form 9-207 contains a listing of <br />summary data associated with current-meter discharge measurements taken at <br />an individual gage station. Included on Form 9-207 are date, water surface <br />width, cross-sectional area of flowing water, mean velocity, gage height, <br />and discharge. Copies of these forms will need to be requested since most <br />of the summary data are not usually published or computerized. <br /> <br />31 - PLANNING <br /> <br />31.1 - Applications and Limitations. Apply this procedure to calculate <br />non:consumptive, in-channel flow regimes needed for channel maintenance to <br />maintain favorable conditions water flows as required by the Organic <br />Administration Act [Act of June 4, 1897 (16 U.S.C. 475)] (FSM 2501). The <br />procedure can be used to evaluate projects that have potential for <br />diminishing the range of frequent discharges that are responSible for <br />forming and. maintaining the active channel. Examples of such projects are: <br /> <br />1. Streams diversion structures that alter natural flows. <br />2. Transmountain diversions (doner streams). <br />3. Reservoirs and their releases. <br />4. Hydroelectric projects. <br />5. Mining projects. <br /> <br />31.11 - Limitations. The application of this procedure does not result in <br />a description of any special purpose flows such as those for fishery, <br />streamside habitat maintenance, water quality, recreational, or esthetic <br />considerations. The calculated flows are designed to maintain only the <br />active channel. ' <br /> <br />IO No. 1 <br />9/10/85 <br />