What the USDA soil descriptions say
| Soil | Where you find it | What it means for a dig |
|---|---|---|
| Dothan | Broad uplands; farmed for peanuts, cotton and corn | Well drained; sandy top, sandy clay below; plinthite from about 24–60 in |
| Fuquay | Uplands with a thick sandy top | 20–40 in of sand; seasonal water table 40–60 in down, January to March |
| Tifton | Uplands with ironstone pebbles | Well drained; seasonal water table 50–60 in, January to March |
| Grady | Depressions and shallow drainageways | Poorly drained; water at or near the surface 6–8 months a year |
USDA Official Soil Series Descriptions, checked November 2026. Your lot may differ; the builder sees the real profile when they dig.
The plinthite layer
Plinthite is an iron-rich, mottled layer that hardens when exposed and slows water moving down. In Dothan soils it starts somewhere between 24 and 60 in (USDA), which is right around the depth of a pool floor. After a long wet spell, water can sit on top of it for a while. That's why a winter dig sometimes finds a damp floor even on a yard that never puddles.
When sand walls cave
Loose sand doesn't hold a vertical cut for long. Blue Haven's Dothan office lists caving sand among local hazards, alongside roots, rock, a high water table in places, and unmarked utility lines, and describes fixes such as compacted pea-gravel backfill, extra gunite and steel, plywood forms and, where needed, a soil engineer (Blue Haven). Ask how your builder handles it and whether it's in the price.
If your yard sits low
A yard that holds water after storms may be on a wetter soil like Grady. In that case ask about pumping during the dig and a hydrostatic relief valve in the main drain, and never drain the pool without talking to the builder. On most upland lots around Dothan this is a minor point, but it's cheap to ask.
Questions for the site visit
Sources & further reading
- USDA soil series: Dothan
- USDA soil series: Fuquay
- USDA soil series: Tifton
- USDA soil series: Grady
- Blue Haven Pools: Dothan. Local site hazards
Editorial note: General planning information, not engineering or legal advice. Prices are estimates; confirm current rules with your local officials and a qualified pro.