Lamar and Delta Counties, Texas
The dominant drainage class is Moderately 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 Lamar and Delta Counties, Texas.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Houston Black clay, 1 to 3 percent slopes | 76K | Moderately well drained | D | Very limited | Very limited |
| Annona loam, 1 to 4 percent slopes | 58K | Moderately well drained | D | Very limited | Very limited |
| Freestone-Hicota complex, 0 to 3 percent slopes | 58K | Moderately well drained | C | Somewhat limited | Very limited |
| Wilson silt loam, 0 to 2 percent slopes | 50K | Moderately well drained | D | Very limited | Very limited |
| Leson clay, 1 to 3 percent slopes | 45K | Moderately well drained | D | Very limited | Very limited |
| Crockett loam, 1 to 3 percent slopes | 36K | Moderately well drained | D | Very limited | Very limited |
| Woodtell loam, 5 to 12 percent slopes | 28K | Well drained | D | Very limited | Very limited |
| Normangee clay loam, 1 to 3 percent slopes | 25K | Moderately well drained | C | Very limited | Very limited |
| Water | 25K | D | Not rated | Not rated | |
| Normangee clay loam, 2 to 5 percent slopes, eroded | 24K | Moderately well drained | C | Very limited | Very limited |
| Trinity clay, 0 to 1 percent slopes, occasionally flooded | 24K | Moderately well drained | D | Very limited | Very limited |
| Whakana-Porum complex, 8 to 20 percent slopes | 21K | Well drained | B | Somewhat limited | Somewhat limited |
| Heiden clay, 2 to 5 percent slopes | 19K | Well drained | D | Very limited | Very limited |
| Trinity clay, 0 to 1 percent slopes, frequently flooded | 18K | Moderately well drained | D | Very limited | Very limited |
| Derly, occasionally ponded-Raino complex, 0 to 1 percent slopes | 16K | Poorly drained | D | Very limited | Very limited |
| Deport clay, 1 to 3 percent slopes | 16K | Somewhat poorly drained | D | Very limited | Very limited |
| Kaufman clay, 0 to 1 percent slopes, frequently flooded | 15K | Moderately well drained | D | Very limited | Very limited |
| Whakana fine sandy loam, 1 to 5 percent slopes | 15K | Well drained | B | Somewhat limited | Somewhat limited |
| Heiden-Ferris complex, 3 to 5 percent slopes | 15K | Well drained | D | Very limited | Very limited |
| Ferris clay, 5 to 12 percent slopes, eroded | 15K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 80% of soils are rated "very limited" for dwellings with basements. Specific challenges include poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 89% 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.