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<br />I . <br /> <br />i <br />" <br /> <br />with the causative meteorological conditions. While a special meteoro- <br />logical study is desirable where possible for this purpose, it is often <br />considered that the start of a probable maximum flood could reasonably, <br />as an extreme possibility, be preceded by the start of the standard <br />project flood 4 or 5 days earlier. <br /> <br />Section 4.10. SumMary of procedure <br /> <br />Procedures used in the computation of probable maxiMUM rainfloods <br />and snowmelt floods are similar to those described in Sections 3.09 and <br />3.10 for the standard project flood. The only significant differences <br />are that criteria used are as described in this chapter and an antecedent <br />flood is used as described in Section 4.09 in lieu of a standard project <br />rainflood series. Computation procedures are as illustrated for the <br />standard project flood in figures 3.04 to 3.06. <br /> <br />Section 4.11. Use of electronic computers <br /> <br />As in the case of standard project floods, computations of probable <br />maximum floods can be accomplished using any of a number of existing <br />computer programs such as those described in Appendix 1 of this Volume <br />and Appendix 1 of Volume 1. Generalized criteria for probable Maximum <br />flood derivation can also be programmed for computer use, as has been <br />done in these two computer programs for criteria in the eastern USA. <br /> <br />4-11 <br />