“Somewhat excessively drained” soil: Free-draining ground with a little more water-holding capacity
Sandy loams and gravelly loams. Still fast, still low in clay.
What it means for a basement
Seepage is possible after extreme rain or snowmelt, but sustained hydrostatic pressure is unusual. Surface water management is normally enough.
Where the USDA definition comes from
Drainage class is assigned per soil component in the national soil survey and describes frequency and duration of wet periods under conditions similar to those under which the soil formed. It is not a measurement taken at your house; it is a classification of a mapped soil body. That distinction is why we phrase every county page as a statement about soil, never as a statement about your basement.
USDA NRCS, National Soil Survey Handbook, part 618. Delivered per map unit in SSURGO.
Counties where “somewhat excessively drained” is the dominant class
39 counties in our coverage.
- Gilchrist County, FL
- Polk County, FL
- St. Johns County, FL
- Volusia County, FL
- Okeechobee County, FL
- Pinellas County, FL
- Hamilton County, FL
- Duval County, FL
- Lafayette County, FL
- Marion County, FL
- Palm Beach County, FL
- Clay County, FL
- Hendry County, FL
- Citrus County, FL
- Highlands County, FL
- Levy County, FL
- Pasco County, FL
- Seminole County, FL
- Sumter County, FL
- Baker County, FL
- Columbia County, FL
- Dixie County, FL
- Miami-Dade County, FL
- Loup County, NE
- Brown County, NE
- Custer County, NE
- Garden County, NE
- McPherson County, NE
- Blaine County, NE
- Cherry County, NE
- Hooker County, NE
- Logan County, NE
- Arthur County, NE
- Garfield County, NE
- Grant County, NE
- Keya Paha County, NE
- Sheridan County, NE
- Rock County, NE
- Thomas County, NE
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