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<br />In many computations, a space (isohyetal) pattern is not used, but <br />a transposition coefficient is used that accounts for the degree to <br />which the isohyetal pattern does not coincide with the basin boundary. <br />Unless the basin shape is very unusual, transposition coefficients for <br />actual storms on actual drainage basins usually are very high - in the <br />order of 0.95. <br />Derivation of storm rainfall for a particular drainage basin from <br />generalized criteria is illustrated for probable maximum storm criteria <br />in paragraph 4.03, Similar techniques can advantageously be used for <br />standard project storm determination. <br /> <br />3-03 <br />