HomeMy WebLinkAboutSW3230604_Soils/Geotechnical Report_20230914 3 Hydrologic Soil G cup—Union County,North Carolina
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Map projection:Wd:Mercator Corner coordinates:WCS84 Edge tics:UTM Zone 17N WCZ84
USDA Natural Resources Web Soil Survey 7/12/2021
mom Conservation Service National Cooperative Soil Survey Page 1 of 4
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Hydrologic Soil G cup—Union County,North Carolina Arm yRoad
Hydrologic Soil G ioup
M ap unit symbol M p unit name Dating A cres in AO I Rrcent of AO I
BaB B adin channery silt C 0 .9 1 .6%
loam,2 to 8 percent
slopes
BaC B adin channery silt C 0 .0 0 .0%
loam,8 to 15 percent
slopes
BdB2 B adin channery silty C 1 7.5 3 0.7%
clay loam,2 to 8
percent slopes,
m cderately eroded
Cm B Gd channery silt loam,1 D 1 2.4 2 1.8%
to 5 percent slopes
o GsB G ldston-Badin D 2 6.1 4 5.9%
corn Ilex,2 to 8
percent slopes
Totals for Area of Interest 5 6.9 1 00.0%
USDA Natural Resources Web Soil Survey 7/12/2021
Conservation Service National Cooperative Soil Survey Page 3 of 4
Hydrologic Soil G cup—Union County, North Carolina Arm yRoad
Description
Hydrologic soil groups are based on estim aces of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storm s
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
G cup A. Soils having a high infiltration rate (low runoff potential)when
thoroughly wet. These consist m anly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transm ssion.
G cup B. Soils having a m cderate infiltration rate when thoroughly wet. These
consist chiefly of m oderately deep or deep, m oderately well drained or well
drained soils that have m oderately fine texture to m oderately coarse texture.
These soils have a m cderate rate of water transm ssion.
G cup C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that im pedes the downward m wem ent of water or
soils of m oderately fine texture or fine texture. These soils have a slow rate of
water transm ssion.
G cup D. Soils having a very slow infiltration rate (high runoff potential)when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly im pervious
m aerial. These soils have a very slow rate of water transm ssion.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. 0 riy the soils that in
their natural condition are in group D are assigned to dual classes.
Rating 0 !lions
Aggregation Mahod: Dom hant Condition
Com ponent Percent Cutoff..None Specified
Tie-break Rule: Higher
USDA Natural Resources Web Soil Survey 7/12/2021
Conservation Service National Cooperative Soil Survey Page 4 of 4