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EROSION CALCULATIONS <br />Tributary Area = 21.84 Ac (cr� CN-87 (Bare Dirt) <br />Time of Concentration = 17.51 minutes <br />Reachl : 300' Sheet Flow @ 3.0%, n, = 0.011 (smooth surfaces) <br />Reach2: 200' Shallow Concentrated Flow @ 3.0% k.-13 (nearly bare gound) <br />I Reach3: 1160' Channel Flow @ 0.5%,14 = 20 (carth lined) <br />Time of Peak <br />2.20 I 4.07 I 1.94 <br />Required Surface Area = 1.2(Q10)/0.00096 <br />Required Surface Area = 1.2(4.07)/0.00096 <br />Required Surface Area = 5087.5 square feet <br />The above calculated surface area will be separated into two sediment ponds which <br />are located along the northerly edge of Lot 2. These ponds will then discharge into <br />the conveyance system in Lot 1 which will discharge into the propostd storm <br />drainage detention and water quality facility located in TrAct A. <br />ISform Drainnge Reporf For Arng Extrusion - Page 17 <br />