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Description of Land use | Hydrologic Soil Group |
A | B | C | D |
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Paved parking lots, roofs, driveways | 98 | 98 | 98 | 98 |
Streets and Roads: |
Paved with curbs and storm sewers | 98 | 98 | 98 | 98 |
Gravel | 76 | 85 | 89 | 91 |
Dirt | 72 | 82 | 87 | 89 |
Cultivated (Agricultural Crop) Land: |
Without conservation treatment (no terraces) | 72 | 81 | 88 | 91 |
With conservation treatment (terraces, contours) | 62 | 71 | 78 | 81 |
Pasture or Range Land: |
Poor (<50% ground cover or heavily grazed) | 68 | 79 | 86 | 89 |
Good (50–75% ground cover; not heavily grazed) | 39 | 61 | 74 | 80 |
Meadow (grass, no grazing, mowed for hay) | 30 | 58 | 71 | 78 |
Brush (good, >75 ground cover) | 30 | 48 | 65 | 73 |
Woods and Forests: |
Poor (small trees/brush destroyed by over-grazing or burning) | 45 | 66 | 77 | 83 |
Fair (grazing but not burned; some brush) | 36 | 60 | 73 | 79 |
Good (no grazing; brush covers ground) | 30 | 55 | 70 | 77 |
Open Spaces (lawns, parks, golf courses, cemeteries, etc.): |
Fair (grass covers 50–75% of area) | 49 | 69 | 79 | 84 |
Good (grass covers >75% of area) | 39 | 61 | 74 | 80 |
Commercial and Business Districts (85 impervious) | 89 | 92 | 94 | 95 |
Industrial Districts (72 impervious) | 81 | 88 | 91 | 93 |
Residential Areas: |
1/8 Acre lots, about 65% impervious | 77 | 85 | 90 | 92 |
1/4 Acre lots, about 38% impervious | 61 | 75 | 83 | 87 |
1/2 Acre lots, about 25% impervious | 54 | 70 | 80 | 85 |
1 Acre lots, about 20% impervious | 51 | 68 | 79 | 84 |
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