Knox County, Texas
The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high runoff). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Knox County, Texas.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Knoco-Badland complex, 1 to 12 percent slopes | 100K | Well drained | D | Very limited | Very limited |
| Miles fine sandy loam, moist, 0 to 1 percent slopes | 39K | Well drained | B | Somewhat limited | Somewhat limited |
| Cottonwood-Knoco complex, 3 to 20 percent slopes | 38K | Well drained | D | Very limited | Very limited |
| Miles fine sandy loam, moist, 1 to 3 percent slopes | 23K | Well drained | B | Somewhat limited | Somewhat limited |
| Grandfield-Devol complex, 0 to 3 percent slopes | 22K | Well drained | B | Not limited | Very limited |
| Hollister clay loam, 0 to 1 percent slopes | 22K | Well drained | C | Very limited | Very limited |
| Mangum clay, frequently flooded | 21K | Well drained | D | Very limited | Very limited |
| Rotan clay loam, 0 to 1 percent slopes | 20K | Well drained | C | Somewhat limited | Very limited |
| Knoco-Vernon complex, 3 to 12 percent slopes | 17K | Well drained | D | Very limited | Very limited |
| Vernon clay, 3 to 8 percent slopes | 17K | Well drained | D | Somewhat limited | Very limited |
| Tillman clay loam, 1 to 3 percent slopes | 16K | Well drained | C | Very limited | Very limited |
| Tillman clay loam, 0 to 1 percent slopes | 15K | Well drained | C | Very limited | Very limited |
| Sagerton clay loam, moist, 0 to 1 percent slopes | 14K | Well drained | C | Somewhat limited | Very limited |
| Clairemont silt loam, 0 to 1 percent slopes, frequently flooded | 13K | Well drained | B | Very limited | Very limited |
| Rotan-Winters-Miles complex, 0 to 1 percent slopes | 12K | Well drained | C | Somewhat limited | Very limited |
| Wichita clay loam, 0 to 1 percent slopes | 10K | Well drained | C | Somewhat limited | Very limited |
| Lincoln-Westola complex, occasionally flooded | 10K | Somewhat excessively drained | A | Very limited | Very limited |
| Cosh fine sandy loam, 1 to 5 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Altus fine sandy loam, warm, 0 to 1 percent slopes | 9K | Well drained | B | Not limited | Very limited |
| Enterprise very fine sandy loam, 0 to 1 percent slopes | 8K | Well drained | A | Not limited | Very limited |
What This Means
Building & Foundations
About 59% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 85% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.