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n= 21 Ts <br />(S~) Dso <br />T~ yRS <br />In which, <br />0 - face slope of pitside bank, in degrees <br />~ - angle of repose of pitside bank construction <br />materials in degrees <br />S~ specific gravity of riprap particles <br />y - specific weight of water 62.4 lbs/f t' <br />Dso - median riprap particle size, in feet <br />R - hydraulic radius at normal depth of flow down <br />pitside slope, in feet <br />S - face slope of pitside bank, in feet per foot <br />SF - Safety factor <br />T = Tractive force <br />Once the Dso is established using the above described proce- <br />dure, a gradation is to be selected. The gradation shall <br />follow the general provisions specified in the USDCM. Material <br />shall be placed in accordance with the criteria specified in <br />the USDCM and as shown on Figure 2.5. <br />2.9.2 Riprap with Vegetation <br />The methodology presented in Section 2.4.1 - Riprap shall be <br />used for sizing riprap when used in conjunction with vegetation <br />on pitside banks. When riprap with vegetation is to be used to <br />stabilize the pitside bank of riverside berms, the placement <br />shall be in accordance with the requirements presented in <br />Section 2.3.2 - Riprap with Vegetation. <br />UD6Fm GRAVEL GUIDELINES 12/17/87 <br />2-14 <br />