Soil Survey of Dallas County, Texas Page: 13
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DALLAS COUNTY, TEXAS
crops, crop residue should be left on the surface to help
control runoff and erosion, reduce soil temperature, con-
serve moisture, and maintain soil tilth and productivity.
This soil is well suited to improved bermudagrass.
This soil has medium potential for urban uses. The
moderate depth, low strength, corrosivity, and high
shrink-swell potential of the soil and the hazard of ero-
sion are limitations to urban development.
This soil is in capability subclass IVe and in the Clay
Loam range site.
7-Austn-Lewisvllle complex, 5 to 8 percent
slopes, eroded. This complex is made up of moderately
deep and deep, well drained soils. These soils are on
the walls and flood plains of sloping, narrow valleys
along creeks. The mapped areas mostly are long and
narrow and range from about 20 to more than 100 acres.
Erosion has removed the original surface layer on about
40 percent of the acreage of these soils. Gullies that are
1 to 2 feet deep and 5 to 20 feet wide are common.
The Austin soil makes up about 50 percent of this
complex, the Lewisville soil makes up about 30 percent,
and minor soils make up the rest. These soils are so
intermingled that it was not practical to separate them at
the scale used in mapping. Typically, the Austin soil is on
the upper and lower parts of slopes, and the Lewisville
soil is on the middle part of slopes and in areas near the
streams.
Typically, the surface layer of the Austin soil is moder-
ately alkaline, very dark grayish brown silty clay about 6
inches thick. Fine chalk fragments are common. To a
depth of 20 inches, the soil is moderately alkaline, dark
brown silty clay. The underlying material is platy chalk or
soft limestone.
Permeability of the Austin soil is moderately slow, and
the available water capacity is low. Runoff is rapid. The
hazard of erosion is severe.
Typically, the surface layer of the Lewisville soil is
moderately alkaline, dark grayish brown silty clay about
19 inches thick. It has a few fragments of soft limestone
and snail shells throughout. To a depth of 66 inches, the
soil is moderately alkaline, light grayish brown silty clay.
The underlying material is platy chalky limestone.
Permeability of the Lewisville soil is moderate, and the
available water capacity is high. Runoff is medium. The
hazard of erosion is severe.
Included in mapping are small areas of Austin silty clay
loam and Brackett, Eddy, Frio, and Stephen soils. The
included soils make up less than 20 percent of any one
mapped area.
These soils generally are wooded and are used as
rangeland. They have medium potential for use as pas-
ture and rangeland.
These soils have medium potential for urban uses.
The severe hazard of erosion, the high shrink-swell po-
tential, low soil strength, corrosivity, moderate depth to
rock, and the hazard of overflow in areas near stream
channels are limitations to urban development. Thesesoils are suitable for parks, nature study areas, and wild-
life habitat.
These soils are in capability subclass Vie and in the
Clay Loam range site.
8-Austin-Urban land complex, 0 to 2 percent
slopes. This complex is made up of nearly level and
gently sloping, well drained soils and areas of Urban
land on uplands (fig. 6). The areas are oval to oblong
and are as much as several hundred acres in size.
The Austin soil makes up about 50 percent of this
complex, and Urban land, which consists of areas cov-
ered by buildings and pavement, makes up 40 percent.
The rest of the complex is made up of minor soils.
These soils and Urban land are so intermingled that it
was not practical to separate them in mapping at the
scale used.
Typically, the surface layer of the Austin soil is very
dark grayish brown, moderately alkaline silty clay about
10 inches thick. To a depth of 32 inches, the soil is
moderately alkaline, brown silty clay. The underlying ma-
terial is white, platy chalk.
Permeability is moderately slow, and the available
water capacity is low. Runoff is medium. The hazard of
erosion is moderate.
Included in mapping are small areas of Dalco, Eddy,
Lewisville, and Stephen soils. The included soils make
up less than 10 percent of any one mapped area.
The soils in this complex have medium potential for
urban uses. The high shrink-swell potential, corrosivity,
low strength, and moderate depth of the soil are limita-
tions.
This map unit was not assigned to a capability sub-
class or a range site.
9-Austin-Urban land complex, 2 to 5 percent
slopes. This complex is made up of gently sloping, well
drained soils and areas of Urban land on uplands. The
areas are oval to oblong and range from 20 to a few
hundred acres in size.
The Austin soil makes up about 60 percent of this
complex, and Urban land, which consists of areas cov-
ered with buildings and pavement, makes up 30 percent.
The rest of this complex is made up of minor soils.
These soils and Urban land are so intermingled that it
was not practical to separate them in mapping at the
scale used.
Typically, the surface layer of the Austin soil is moder-
ately alkaline, very dark grayish brown silty clay about 8
inches thick. To a depth of 20 inches, the soil is moder-
ately alkaline, brown silty clay. The underlying material is
white chalk that is platy in the upper part and massive
below that.
Permeability is moderately slow, and the available
water capacity is low. Runoff is medium. The hazard of
erosion is moderate.
Included in mapping are small areas of Brackett, Eddy,
Lewisville, and Stephen soils. The included soils make
up as much as 10 percent of any one mapped area.13
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General Soil Map, Dallas County, Texas (Map)
Map displays soil types along with creeks, towns, schools, churches, power transmission lines, oil and gas pipelines, roads, and railroads. Includes legend and symbols. Scale 1:253,400
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Coffee, Daniel R. Soil Survey of Dallas County, Texas, book, 1980; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth130211/m1/23/?rotate=90: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.