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Chapter 2 Stormwater Management Appendix - Fauquier County

Chapter 2 Stormwater Management Appendix - Fauquier County

Design Standards Manual

Design Standards Manual 1 st Edition Figure 2.9 Runoff Curve Numbers for other Agricultural Lands* Cover Description Curve Numbers for Hydrologic Soil Groups Cover Type Hydrologic Condition A B C D Pasture, grassland, or range-continuous forage for grazing Poor 68 79 86 89 Pasture, grassland, or range-continuous forage for grazing Fair 49 69 79 84 Pasture, grassland, or range-continuous forage for grazing Good 39 61 74 80 Meadow–continuous grass, protected from grazing and generally mowed for hay - 30 58 71 78 Brush–brush-weed-grass mixture with brush the major element Poor 48 67 77 83 Brush–brush-weed-grass mixture with brush the major element Fair 35 56 70 77 Brush–brush-weed-grass mixture with brush the major element Good 30 48 65 73 Woods-grass combination (orchard or tree farm) Poor 57 73 82 86 Woods-grass combination (orchard or tree farm) Fair 43 65 76 82 Woods-grass combination (orchard or tree Good 32 58 72 79 farm) Woods Poor 45 66 77 83 Woods Fair 36 60 73 79 Woods Good 30 55 70 77 Farmsteads-buildings, lanes, driveways, and surrounding lots - 59 74 82 86 *Average runoff condition and Ia = 0.2S Source: TR-55, Table 2-2c Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-46

Design Standards Manual 1 st Edition NRCS Rainfall Depths Figure 2.10 Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-47

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