HuA—Humphreys

HuA—Humphreys gravelly silt loam, 0 to 2 percent slopes, occasionally flooded

Map Unit Setting

  • National map unit symbol: kpw3

  • 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: All areas are prime farmland

Map Unit Composition

  • Humphreys and similar soils: 90 percent

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

Description of Humphreys

Setting
  • Landform: Stream terraces

  • Landform position (three-dimensional): Tread

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

Typical profile
  • H1 - 0 to 9 inches: gravelly silt loam

  • H2 - 9 to 39 inches: gravelly silt loam

  • H3 - 39 to 60 inches: extremely gravelly sandy loam

Properties and qualities
  • Slope: 0 to 2 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: Occasional

  • 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): 2w

  • Hydrologic Soil Group: A

  • Hydric soil rating: No

HuB—Humphreys gravelly silt loam, 2 to 5 percent slopes

Map Unit Setting

  • National map unit symbol: 2qh70

  • Elevation: 360 to 800 feet

  • Mean annual precipitation: 48 to 58 inches

  • Mean annual air temperature: 57 to 59 degrees F

  • Frost-free period: 190 to 230 days

  • Farmland classification: All areas are prime farmland

Map Unit Composition

  • Humphreys and similar soils: 90 percent

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

Description of Humphreys

Setting
  • Landform: Stream terraces

  • Landform position (two-dimensional): Footslope

  • Landform position (three-dimensional): Base slope, tread

  • Down-slope shape: Concave, convex

  • Across-slope shape: Linear, convex

  • Parent material: Gravelly slope alluvium derived from cherty limestone

Typical profile
  • Ap - 0 to 10 inches: gravelly silt loam

  • Bt - 10 to 27 inches: gravelly silt loam

  • BC, C - 27 to 42 inches: extremely gravelly coarse sandy loam

  • 2Bt - 42 to 80 inches: gravelly silt loam

Properties and qualities
  • Slope: 2 to 5 percent

  • Depth to restrictive feature: More than 80 inches

  • Natural drainage class: Well drained

  • Runoff class: Very low

  • 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

  • Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)

  • Available water storage in profile: Moderate (about 6.1 inches)

Interpretive groups
  • Land capability classification (irrigated): 2e

  • Land capability classification (nonirrigated): 2e

  • Hydrologic Soil Group: A

  • Hydric soil rating: No

 


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