ThC2—Tarklin-Humphreys

ThC2—Tarklin-Humphreys complex, 5 to 12 percent slopes, eroded

Map Unit Setting

  • National map unit symbol: kpwx

  • Elevation: 600 to 1,200 feet

  • Mean annual precipitation: 46 to 60 inches

  • Mean annual air temperature: 57 to 61 degrees F

  • Frost-free period: 180 to 205 days

  • Farmland classification: Not prime farmland

Map Unit Composition

  • Tarklin and similar soils: 65 percent

  • Humphreys and similar soils: 30 percent

  • Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Tarklin

Setting
  • Landform: Hillslopes

  • Landform position (three-dimensional): Base slope

  • Parent material: Gravelly colluvium and/or alluvium derived from cherty limestone

Typical profile
  • H1 - 0 to 6 inches: gravelly silt loam

  • H2 - 6 to 35 inches: gravelly silty clay loam

  • H3 - 35 to 60 inches: gravelly silt loam

Properties and qualities
  • Slope: 5 to 12 percent

  • Depth to restrictive feature: 18 to 36 inches to fragipan

  • Natural drainage class: Moderately well drained

  • Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr)

  • Depth to water table: About 18 to 24 inches

  • Frequency of flooding: None

  • Frequency of ponding: None

  • Available water storage in profile: Low (about 5.6 inches)

Interpretive groups
  • Land capability classification (irrigated): None specified

  • Land capability classification (nonirrigated): 3e

  • Hydrologic Soil Group: B/D

  • Hydric soil rating: No

Description of Humphreys

Setting
  • Landform: Stream terraces

  • Landform position (three-dimensional): Riser

  • Parent material: Loamy alluvium and/or colluvium derived from limestone

Typical profile
  • H1 - 0 to 5 inches: gravelly silt loam

  • H2 - 5 to 58 inches: gravelly silt loam

  • H3 - 58 to 60 inches: extremely gravelly sandy loam

Properties and qualities
  • Slope: 5 to 12 percent

  • Depth to restrictive feature: More than 80 inches

  • Natural drainage class: Well drained

  • Capacity of the most limiting layer to transmit water (Ksat): High (2.00 to 6.00 in/hr)

  • Depth to water table: About 60 to 72 inches

  • Frequency of flooding: None

  • Frequency of ponding: None

  • Available water storage in profile: Moderate (about 7.1 inches)

Interpretive groups
  • Land capability classification (irrigated): None specified

  • Land capability classification (nonirrigated): 3e

  • Hydrologic Soil Group: A

  • Hydric soil rating: No

 


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