Islands of Truk, Federated States of Micronesia
The dominant drainage class is Well drained and the dominant hydrologic group is A (high infiltration, low 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 Islands of Truk, Federated States of Micronesia.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Tolonier very stony silty clay loam, 30 to 50 percent slopes | 5K | Well drained | A | Very limited | Very limited |
| Chia mucky peat, 0 to 2 percent slopes, frequently flooded | 2K | Very poorly drained | A/D | Very limited | Very limited |
| Tolonier very stony silty clay loam, 50 to 75 percent slopes | 2K | Well drained | A | Very limited | Very limited |
| Tolonier very stony silty clay loam, 12 to 30 percent slopes | 2K | Well drained | A | Very limited | Very limited |
| Dolen silty clay loam, 12 to 30 percent slopes | 2K | Well drained | A | Very limited | Very limited |
| Rock outcrop-Rubble land complex, 0 to 99 percent slopes | 1K | Not rated | Not rated | ||
| Ngerungor mucky peat, 0 to 1 percent slopes, MLRA 195 | 1K | Very poorly drained | A/D | Very limited | Very limited |
| Dolen silty clay loam, 6 to 12 percent slopes | 1K | Well drained | A | Somewhat limited | Very limited |
| Typic Udorthents-Urban land complex, 0 to 1 percent slopes | 857 | Well drained | A | Not limited | Very limited |
| Dolen silty clay loam, 30 to 50 percent slopes | 850 | Well drained | A | Very limited | Very limited |
| Tolonier very stony silty clay loam, 6 to 12 percent slopes | 758 | Well drained | A | Very limited | Very limited |
| Dublon loamy fine sand, 0 to 2 percent slopes, occasionally flooded | 677 | Somewhat poorly drained | A | Very limited | Very limited |
| Ollei taxadjunct-Wahrekdam complex, 2 to 8 percent slopes | 440 | Well drained | D | Very limited | Very limited |
| Insak taxadjunct sandy peat, 0 to 2 percent slopes, frequently flooded | 380 | Very poorly drained | B/D | Very limited | Very limited |
| Dolen silty clay loam, 50 to 75 percent slopes | 148 | Well drained | A | Very limited | Very limited |
| Typic Tropohemists, 0 to 2 percent slopes, MLRA 195 | 30 | Very poorly drained | A/D | Very limited | Very limited |
| Water | 11 | D | Not rated | Not rated |
What This Means
Building & Foundations
About 85% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 94% 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
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.