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              Development of TMDLs and Implementation Plans Problem Identification
Final Report 12 September 2003
Ava Series. The Ava series consists of moderately well drained soils on convex ridges
and side slopes of drainage ways on till plains. They formed in loess and the underlying
silty or loamy deposits that overlie a strongly developed paleosol. They have a bisequal
profile that is moderately deep to a fragipan and very deep to bedrock. Ava soils are
moderately permeable in the upper part of the solum, and very slowly permeable in the
fragipan horizon. Slope ranges from 0 to 18 percent.
Bluford Series. The Bluford series consists of very deep, somewhat poorly drained soils
on hill slopes and knolls. They formed in loess and the underlying silty or loamy
sediments. Permeability is low. Slopes range from 0 to 7 percent.
Cisne Series. The Cisne series consists of very deep, poorly drained, very slowly
permeable soils on till plains. They formed in loess and the underlying gritty loess or
pedisediment. Slopes range from 0 to 2 percent.
Darmstadt Series. The Darmstadt series consists of very deep, somewhat poorly drained,
very slowly permeable soils formed in loess, or in loess and the underlying silty
pedisediment on till plains. These soils contain a concentration of exchangeable sodium
in the subsoil. Slopes range from 0 to 10 percent.
Hickory Series. The Hickory series consists of very deep, well-drained, moderately
permeable soils on dissected till plains. They formed in till that can be capped with up to
20 inches of loess. Slope ranges from 5 to 70 percent.
Hoyleton Series. The Hoyleton series consists of deep, somewhat poorly drained, slowly
permeable soils on low convex ridges on uplands. They formed in loess and the
underlying silty or loamy deposits which overlie a strongly weathered paleosol in the
Illinoian till. Slopes range from 0 to 7 percent.
Hurst Series. The Hurst series consists of very deep, somewhat poorly drained, very
slowly permeable soils on lacustrine terraces and lake plains, mainly along major
tributaries of the Mississippi River. They formed dominantly in clayey lacustrine
sediments and typically have a thin mantle of loess or other silty material. Slopes range
from 0 to 15 percent.
Patton Series. The Patton series consists of deep, poorly drained and very poorly drained
soils formed in lacustrine sediments on stream terraces and glacial lake plains.
Permeability is moderate in the solum and moderate or moderately slow in the underlying
material. Slope gradient range from 0 to 2 percent.