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ABOS19H am Exp1mm- c9mold 9flQRT CO BSE -_ PmQe 24 <br /> Table 1 : C-Factor and P-Factor Values for Rainfall Erosion <br /> Control Measures (from HDI, December, 1991) . <br /> ent - -- C-Factor F-Factor <br /> BARE SOIL <br /> Packed and Smooth . . . . . . . . . . . . 1. 00 1. 00 <br /> Freshly Disked . . . . . . . . . . . . . 1 . 00 0 .90 <br /> Rough Irregular Surface . . . . . . . . . 1. 00 0 .90 <br /> SEDIMENT BASIN/TRAP . . . . . . . . . . . . . 1 . 00 0 .50A <br /> RMBIER4 GRAVEL FILTER, SAND BAGS 1.00 <br /> ot <br /> SILT FENCE BARRIER . . . . . . . . . . . . 1. 00 5 0 <br /> LT/&BA�� <br /> CO TE PAVEMENT . . . . . . . . . . 0 - 01 1 .00 <br /> ASPHALT/CO <br /> GRAVEL (1/40 To 1 1/20 ) @ 135 TONS/ACRE. . . . 0.05 1 . 00 <br /> ESTABLISHED NATIVE GRASS . . . . . . . . . . . Fig 4 1.00 <br /> SOD GRASS . . . . . . . . . . . . . . . . . . 0.01 1. 00 <br /> TEMPORARY VEGETATION/COVER CROP . . . . . . . 0.458 1.00 <br /> HYDRAULIC MULCH @ 2 TONS/ACRE . . . . . . . . 0.10C 1.00 <br /> . . . . <br /> SOIL SEALANT . . . . . . . . . . . . 0.01 - 0 .60D 1 .00 <br /> EROSION CONTROL MATS/BLANKETS . . . . . . . . 0. 10 1 . 00 <br /> HAY OR STRAW DRY MULCH @ 2 TONS/ACRE & ANCHORED <br /> Assumes planting of grass seed has occurred prior to <br /> application, otherwise C-Factor = 1 .00. <br /> - e- ll <br /> 1 to 10 . . . . . . . . . . . . . . . . 0. 06 1.00 <br /> 11 to 15 . . . . . . . . . . . . . . . . 0. 07 1 . 00 <br /> 16 to 20 . . . . . . . . . . . . . . . . 0.11 1. 00 <br /> 21 to 25 . . . . . . . . . . . . . . . . 0. 14 1.00 <br /> 25 to 33 . . . . . . . . . . . . . . . . 0.17 1.00 <br /> > 33 . . . . . . . . . . . . . . . . 0.20 1 .00 <br /> CONTOUR FURROWED SURFACE <br /> Must be maintained throughout construction activities, <br /> otherwise P-Factor = 1. 00 . Maximum length refers to down <br /> slope length. <br /> Slone (1) Max Length-1teeLl <br /> 1 to 2 400 . . . . . . . . . . . 1.00 0. 60 <br /> 3 to 5 300 . . . . . . . . . . . 1.00 0 .50 <br /> 6 to 8 200 . . . . . . . . . . . 1.00 0 .50 <br /> 9 to 12 120 . . . . . . . . . . . 1.00 0 . 60 <br /> 13 to 16 80 . . . . . . . . . . . 1.00 0 .70 <br /> 17 to 20 60 . . .. . . . . . . . . 1. 00 0 .80 <br /> > 20 50 . . . . . . . . . . . 1.00 0.80 <br /> NOTE: Use of other C-Factor of P-Factor values reported in this <br /> table should be substantiated by documentation <br /> A: Should be constructed as the first step in over lot grading <br /> B: Assumes planting occurs within optimal climatic conditions <br /> C: Some limitation on use in arid and semi-arid climates <br /> D: Value used must be substantiated by documentation <br />