Graham County, Kansas
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). 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 Graham County, Kansas.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Holdrege silt loam, 1 to 3 percent slopes, plains and breaks | 159K | Well drained | C | Not limited | Very limited |
| Penden-Uly complex, 7 to 20 percent slopes | 93K | Well drained | B | Somewhat limited | Somewhat limited |
| Uly silt loam, 3 to 6 percent slopes | 80K | Well drained | B | Not limited | Somewhat limited |
| Coly silt loam, 3 to 6 percent slopes | 41K | Well drained | B | Not limited | Somewhat limited |
| Coly silt loam, 6 to 20 percent slopes | 25K | Well drained | B | Somewhat limited | Somewhat limited |
| Humbarger loam, channeled | 22K | Well drained | B | Very limited | Very limited |
| Penden-Canlon loams, 7 to 30 percent slopes | 17K | Well drained | B | Very limited | Very limited |
| Wakeen-Nibson complex, 5 to 20 percent slopes | 16K | Well drained | C | Somewhat limited | Very limited |
| Penden loam, 3 to 7 percent slopes | 14K | Well drained | B | Not limited | Somewhat limited |
| Humbarger loam, occasionally flooded | 13K | Well drained | B | Very limited | Very limited |
| Penden clay loam, 3 to 7 percent slopes, eroded | 13K | Well drained | B | Not limited | Somewhat limited |
| Holdrege silt loam, 0 to 1 percent slopes, plains and breaks | 11K | Well drained | C | Not limited | Very limited |
| Uly silt loam, 6 to 11 percent slopes | 10K | Well drained | B | Not limited | Somewhat limited |
| Hord silt loam, rarely flooded | 8K | Well drained | B | Very limited | Somewhat limited |
| Munjor sandy loam, occasionally flooded | 7K | Well drained | A | Very limited | Very limited |
| Bridgeport silt loam, rarely flooded | 6K | Well drained | B | Very limited | Somewhat limited |
| Wakeen-Nibson silt loams, 3 to 7 percent slopes | 6K | Well drained | C | Somewhat limited | Very limited |
| Campus-Canlon complex, 3 to 30 percent slopes | 6K | Well drained | C | Very limited | Very limited |
| Uly-Penden complex, 6 to 20 percent slopes | 5K | Well drained | B | Somewhat limited | Somewhat limited |
| Inavale sand, channeled | 4K | Excessively drained | A | Very limited | Very limited |
What This Means
Building & Foundations
Most soils are generally favorable for residential construction. Standard foundations are usually viable, though site-specific evaluation is always recommended.
Septic Systems
About 47% of soils have significant septic limitations, while others are more suitable. A perc test is essential — conditions vary across the area.
Gardening & Agriculture
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.