Terrebonne Parish, Louisiana

Survey Area LA109 Louisiana

The dominant drainage class is Very poorly 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 Terrebonne Parish, Louisiana.

Soil Map UnitAcresDrainageHydro GroupDwellingsSeptic
Water 309K Not ratedNot rated
Kenner muck, 0 to 1 percent slopes, very frequently flooded 116K Very poorly drainedDVery limitedVery limited
Allemands muck, 0 to 0.2 percent slopes, very frequently flooded 71K Very poorly drainedA/DVery limitedVery limited
Timbalier muck, 0 to 0.2 percent slopes, tidal 69K Very poorly drainedA/DVery limitedVery limited
Clovelly muck, slightly saline, tidal 52K Very poorly drainedDVery limitedVery limited
Barbary muck, 0 to 1 percent slopes, frequently flooded 46K Very poorly drainedDVery limitedVery limited
Bellpass muck, 0 to 0.2 percent slopes, very frequently flooded 40K Very poorly drainedDVery limitedVery limited
Lafitte muck, slightly saline, tidal 36K Very poorly drainedA/DVery limitedVery limited
Fausse clay, 0 to 1 percent slopes, frequently flooded 31K Very poorly drainedDVery limitedVery limited
Clovelly muck, very slightly saline, tidal 25K Very poorly drainedA/DVery limitedVery limited
Schriever clay, 0 to 1 percent slopes, rarely flooded 25K Poorly drainedDVery limitedVery limited
Scatlake muck, 0 to 0.2 percent slopes, tidal 25K Very poorly drainedDVery limitedVery limited
Cancienne silty clay loam, 0 to 1 percent slopes 22K Somewhat poorly drainedCSomewhat limitedVery limited
Aquents, dredged, 1 to 5 percent slopes, occasionally flooded 21K Very poorly drainedDNot ratedNot rated
Lafitte muck, very slightly saline, tidal 20K Very poorly drainedA/DVery limitedVery limited
Larose muck, 0 to 0.5 percent slopes, tidal 19K Very poorly drainedC/DVery limitedVery limited
Schriever clay, 0 to 1 percent slopes, occasionally flooded 19K Poorly drainedDVery limitedVery limited
Schriever clay, 0 to 1 percent slopes, frequently flooded 18K Poorly drainedDVery limitedVery limited
Allemands and Carlin soils, 0 to 0.2 percent slopes, very frequently flooded 16K Very poorly drainedA/DVery limitedVery limited
Cancienne silt loam, 0 to 1 percent slopes 13K Somewhat poorly drainedCSomewhat limitedVery limited

What This Means

Building & Foundations

About 63% 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 66% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.

Gardening & Agriculture

Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.

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