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<br />CHAPTER 2 <br /> <br />e <br /> <br />GENERAL APPROACHES TO FREQUEt-.CV ANAL VSlS FOR lJI'.(;AGEO BASINS <br /> <br />The method used for hydrologic analysis of an ungaged basin depends upon <br />many factors. These include: <br /> <br />(A) Type of information required: <br /> <br />(1) Peak flow. Only the maximum discharge at some point in the <br />basin is needed in many cases, <br />(2) VDlume of flow, The total storm runoff is required in some <br />circumstances. <br />(3) Rate of runDff over an extended period of time. A complete <br />hydrograph for a given frequency flood must be specified in <br />many cases. <br /> <br />(8) Type of data available: <br /> <br />e <br /> <br />(1) Precipitation. Data may be available only for adjacent basins, <br />(2) Basin characteristics, Required for basin modeling or for <br />regionalization analysis. <br />(3) Observed or computed peaks for major events. Although no gage <br />exists for long term records, some data may be available for <br />isolated events, <br />(4) High water marks of major historical events. These can be <br />used for calibratiDn of a basin model. <br /> <br />(C) Characteristics and location of the watershed being studied. <br /> <br />(0) Resources. <br /> <br />(1) Experience of the hydrologist, familiarity with Blternative <br />methods, and access to computer facilities. <br />(2) Study time-frame and manpower available. <br /> <br />e <br /> <br />4 <br />