V3 RESUBMISSION Stormwater Management Report Rev 2 Dated November 3 2022

Chapter 2 Estimating Runoff chnical Release 5: Urban Hydrology for Small Watersheds, Table 2-2c — Runoff curve numbers for other agricultural lands -———--~ Cover description Curve numbers for hydrologic soil group — Hydrologic Cover type condition A B c D Pasture, grassland, or range—continuous Poor 68 79 86 89 forage for grazing, ¥ Fair 49 69 79 84 Good 39 61 4 80 Meadow—continuous grass, protected from _ 30 58 a 78 grazing and generally mowed for hay. Brush—brush-weed-grass mixture with brush Poor 48 67 7 83 the major element. ¥ Fair 35 56 70 7 Good 30" 48 65 B Woods—grass combination (orchard Poor 57 3 82 86 or tree farm). Fair 3 65 76 82 Good 32 58 2B 79 Woods. Poor 45 66 7 83 Fair 36 60 B 79 Good 304 55 70 7 Farmsteads—buildings, lanes, driveways, — 74 82 86 and smrounding lots. ! Average runoff condition, and I, = 0.28. Poor: <50%) ground cover or heavily grazed with no mulch. Fair: 50 to 75% ground cover and not heavily grazed. Good: >7 <50% ground cover. 50 to 75% ground cover. Good: >75% ground cover. 1 Actual curve number is less than 30; use C ° CN's shown were computed for areas with 50% wo from the CN’s for woods and pasture. % Poor: Forest litter, small trees, and brush are destroyed by heavy grazing or regular bumning. oods ani 4 ground cover and lightly or only occasionally grazed. 0) for runoff computations, 50% grass (pasture) cover. Other combinations of conditions may be computed Fair: Woods are grazed but not burned, and some forest lilter covers the soil. Good: Woods are protected from grav (210-VET) ng, and litter and brush adequately cover the soil. 5, Second Ed., Jume 1986)