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~ a ~n ~, . ~ <br />Revised 1/11/80 <br />'. • Section 780.21(b) Continued. <br />Generally, all diversions have been designed and will be <br />constructed, maintained and reclaimed in accordance with <br />Section 816.43. Specific design criteria for both tempo- <br />rary and permanent diversion structures are shown in Tab- <br />le 100, Temporary Diversion Structure Specifications and <br />Figure 32, Permanent Diversion Structures, respectively, <br />and are discussed in more detail under Sections 780.29 <br />and 816.43. <br />LRCWE has re-sized the permanent diversion ditches for <br />EFC, using Charts 15, 17, 19 and 21 from "Design Charts <br />~ ~ for Open-Channel Flow" previously cited. For grass chan- <br />nels an "n" of 0.03 was used; riprap lined channels were <br />assigned an "n" of 0.045. A revised Figure 32 reflects <br />these lower "n" values. Backup calculations have been <br />included in Appendix C which has been added to Exhibit <br />13. <br />LRCWE has recalculated the curve numbers for EFC, using <br />CN 90 (AMC-II) for disturbed areas, CN 68 for undisturbed <br />areas. Average CN calculations were performed using <br />standard area-weighting techniques. As shown on p. 816- <br />• <br />780-151(a) <br />