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<br />1-0:1. <br /> <br />STATISTICAL ME'lliODS IN HYDROLOOY <br /> <br />S:WTION 1 - INTRODtlCTION <br /> <br />1-01. NATURE AND OBJECTIV&'3 OF STATISTICAL ANALYSIS <br /> <br />Statistical ena.lysiB as applied in hydrologic engineering <br />cons1stsof (a) estimating the future frequency or probability <br />of hydrologic events based on information contained in hydrologic <br />records and (b) correlating interrelated hydrologic variables . <br />In probability ~es, statistical methods pe1'lll1t coordination <br />of observed data to yield a more accurate estimate of future fre- <br />quencies than is indicated by the raw data, and also provide <br />criteria for judging the reliability of the f'requency estimates. <br />In correlation analyses, statistical methods provide means for <br />deriving the most likely relationship between two variables, and <br />also provide criteria for judging the reliability of forecasts <br />or estimates based on the derived relationship. <br /> <br />1-02. <br /> <br />PURPOSE AND SCOPE <br /> <br />a. This is a revision of the paper of' the same title dated <br />July 1952 end distributed to Corps of' Engineers offices by <br />Engineer Bulletin 52-24, dated 26 August 1952. The revision <br />incorporates new material developed under the Civil Works Inves- <br />tigations program of' the Corps. <br /> <br />b. It is the purpose of this 'publicat:hontodescrtbeimd <br />illustrate the application of statistics in hydrologic engineering. <br />The subject matter covers the following items: <br /> <br />and correlation ~ses that are applicable ,in hydrologic engineer- <br />ing, with a guide to supplemental reading for further treatment. <br /> <br />(2) Presentation of detailed computation procedures and <br />supporting justifications and computation aids for derivation of <br />probability of frequency estimates based on analysis of hydrologic <br />records that have beell. adjusted as required to confonn with <br />selected reference base conditions. <br /> <br />(3) A summary of procedures for developing "regionalized" <br />hydrologic frequency estimates , based on analyses of hydrologic <br />records available at stream gaging stations, adjusted to provide <br />generalized flood-frequency relations that are considered most <br />representative of long-period hydrologic characteristics in various <br />drainage areas in the region. A:Lso, illustrations BlId explanations <br /> <br />- 1 - <br />