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The details of the SCS Tractive force design procedures aze presented in Appendix B -North Fork <br />of the Gunnison River data. <br />Results show that boulders aze stable for the cases of the wall and the bottom, however, since the <br />water in a large flood will hit the wall at an angle of between 60 to 90 degrees, scour of the em- <br />bankment earth under the large rock is a concern In order to address this, the existing rock or con- <br />crete slabs will be imbedded in the bank for depth of at least 3 feet and the large boulders will be <br />placed on top of this rock. If the existing rock is not of sufficient size (at least 3 ft diameter) ,then <br />additional rock must be imported for this bedding layer. See diagram below for a depiction of the <br />design: <br />NEJ StOR-` EOF~ <br />RIVER CMO ANKMEAIT ~ Yoa OP bANK <br />QQOr~cY~oN DETAIL <br />EXD SuaPE EOG,E <br />Dso=tis' ~~ ~~// <br />Aoeq ©~ .- <br />Roelc <br />Dso=3a~ <br />Dt7RHFStF RGrx <br />wW~ -- '- IMBEDa£y IN EkISriNlo gPNK <br />EXt16W AL <br />EM,pANKME"Ift~ <br />o~ 5~ IOC <br />SCAI.F <br />North Fork Pit Mazch 04 28 <br />