manual for estimation of probable maximum precipitation - WMO
manual for estimation of probable maximum precipitation - WMO
manual for estimation of probable maximum precipitation - WMO
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XXII SUMMARY<br />
All but one <strong>of</strong> the procedures described are based on the<br />
meteorological, or traditional approacho The one exception is a statistical<br />
proceduree The traditional approach consists essentially <strong>of</strong> moisture<br />
maximization and. transposition <strong>of</strong> observed storms. Wind maximization is<br />
sometimes used. Storm transposition involves adjustments <strong>for</strong> elevation,<br />
moisture-inflow barriers, and distance from the moisture source.. These<br />
adjustments are founded on hypothetical storm models. A variation <strong>of</strong> the<br />
traditional approach is the use <strong>of</strong> an orographic computation model in<br />
mountainous regions. Methods are descrLbed <strong>for</strong> determining the seasonal<br />
variation and chronological and areal distribution <strong>of</strong> PMP.<br />
Tables <strong>of</strong> precipitable water in a saturated pseudo-adiabatic<br />
atmosphere are included <strong>for</strong> making various adjustments involving atmospheric<br />
moisture. Also included are world record and near-record rainfalls that may<br />
be used <strong>for</strong> making rough assessments <strong>of</strong> derived PMP estimates.<br />
This <strong>manual</strong>, as was the first version, was written under the<br />
assumption that the user would be a meteorologist. No attempt has been made<br />
to define or discuss basic meteorological terms or processes.. It is<br />
believed that the procedures described are presented in sufficient detail to<br />
permit the pr<strong>of</strong>essional meteorologist, especially one with hydrological<br />
training and ingenuity, to proceed with their application to the usual<br />
problems involved in estimating PMP.