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L.G Everist, Inc. Bank Armoring Plan (cont) <br /> West Farm Reservoirs Safety Factor Calculations <br /> SF = cos B tan 0 _ 21 Ts <br /> 1t tart 0+sin 0 Ts = YRS » (ss-1)Y D o <br /> s <br /> g = face slope of pitside bank,in degrees to the horizontal <br /> 0 = angle of repose of pitside bank construction materials in degrees <br /> n = stability factor <br /> Ss = specific gravity of riprap particles <br /> Y = specific weight of water=62.4 lbslf? <br /> Dso = median riprap particle size,in feet <br /> R = hydraulic radius at normal depth of flow down pitside slope,in feet <br /> S = face slope of pitside bank,in feet per foot <br /> TS = YRS <br /> Y= 62.4 <br /> R = 2 <br /> S = 0.01 <br /> =.1.248 <br /> 21 Ts <br /> h = <br /> (Ss-1)Y Dso <br /> s = 1.248 <br /> SS = 2.4 26.2 <br /> D50 = 1 87.4 n . <br /> SF s cos 6 tan 0 <br /> n tan 0+sin 0 <br /> n =0.3 <br /> cos0 = 0.9487 0.6643 <br /> 0=18.430 tanO =0.7002 SF = <br /> 0=35° sin6 = 0.3161 0.5262 SF = 1.26 <br /> 117 <br />