Arch , Portales, and Pep soils are on slightly higher landscape positions and have 35 percent or less clay in the particle-size control section. Drake soils are on calcareous eolian dunes and have 35 percent or less clay in the particle-size control section. Estacado and Pullman soils are on surrounding plains and have an argillic horizon. Lofton soils are on similar or slightly higher landscape positions and have an argillic horizon. Very slow permeability.
Surface runoff is negligible.
These soils pond for very long periods in most years. Vegetation varies according to amount of water available. It includes knotgrass, bur ragweed, sedges, spike rushes, smartweed, saltmarsh aster, curly dock, frog-fruit, and bushy knotweed. In areas of standing water longbarb arrowhead, soft-stem bulrush, and southern cattail may be present. Around the margins, where ponding occurs for shorter periods the woody vegetation includes western willow and some cottonwood.