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n'nr.~mhrr lT/7 (_'PCC,• - Sediment Yield Qrmrnnntninn - Aluir 3 . - <br />• Block Suuth <br />Hydrologic Soil Group: Predominantly C <br />Land Use Description: Pasture/Range <br />Condition: Good <br />Cover Type: Gras's <br />CN: 74 <br />Dryland Reference Area <br />Hydrologic Soil Group: C <br />Land Use Description: Rleadow, Nay cropland <br />Condition: Good <br />Cover Type: grass <br />CN: 78 <br />Low Sage Reference Area , <br />Hydrologic Soil Group: D <br />Land Use Description: Pastureland/Range <br />Condition: Good <br />Cover Type: Grass and Sagebrush <br />CN: 80 <br />Pastureland Reference Area <br />Hydrologic Soil Group: C <br />Land Use Description: Pastureland/Range <br />• Condition: Good <br />Cover Type: Grass and Sagebrush <br />CN: 74 <br />Combined Reference Area <br />Hydrologic Soil Group: Predominately C <br />Land Use Description: Pasture/Range <br />Condition: Good <br />Cover Type: Grass and Sagebrush <br />CN: 77 <br />2.2 SEDIMENTOLOGY <br />Sediment yield was calculated by SEDCAD+ for single storm events for Blocks North and South and the <br />Combined Reference Area. SEDCAD+ develops a sediment graph utilizing [he Revised Universal Soil Loss <br />Equation (RUBLE) using a revised representative length-slope factor as follows: <br />}' = 95(Y x Q~)osaK(LS)(CP) <br />Where: Y <br />V <br />• QP <br />K <br />LS <br />CP <br />Sediment yield in tons <br />Runoff volume in acre-feet <br />Peak Discharge in cfs <br />Soil erodibility factor <br />Representative length-slope factor <br />Control practice factor <br />i ~ \bond re I\m i ne3 Csed\Sedm i ne 3.doc <br />