TrA—Trace

TrA—Trace silt loam, 0 to 2 percent slopes, occasionally flooded

Map Unit Setting

  • National map unit symbol: kpwy

  • Elevation: 430 to 600 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

  • Trace and similar soils: 95 percent

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

Description of Trace

Setting
  • Landform: Stream terraces

  • Landform position (three-dimensional): Tread

  • Parent material: Silty alluvium over gravelly alluvium

Typical profile
  • H1 - 0 to 8 inches: silt loam

  • H2 - 8 to 36 inches: silt loam

  • H3 - 36 to 41 inches: gravelly silt loam

  • H4 - 41 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): Moderately high to high (0.60 to 2.00 in/hr)

  • Depth to water table: More than 80 inches

  • Frequency of flooding: Occasional

  • Frequency of ponding: None

  • Available water storage in profile: Moderate (about 8.3 inches)

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

  • Land capability classification (nonirrigated): 2w

  • Hydrologic Soil Group: B

  • Hydric soil rating: No

TrB—Trace silt loam, 2 to 5 percent slopes, rarely flooded

Map Unit Setting

  • National map unit symbol: kpwz

  • Elevation: 430 to 600 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

  • Trace and similar soils: 85 percent

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

Description of Trace

Setting
  • Landform: Stream terraces

  • Landform position (three-dimensional): Tread

  • Parent material: Silty alluvium over gravelly alluvium

Typical profile
  • H1 - 0 to 8 inches: silt loam

  • H2 - 8 to 36 inches: silt loam

  • H3 - 36 to 41 inches: gravelly silt loam

  • H4 - 41 to 60 inches: extremely gravelly sandy loam

Properties and qualities
  • Slope: 2 to 5 percent

  • Depth to restrictive feature: More than 80 inches

  • Natural drainage class: Well drained

  • Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.60 to 2.00 in/hr)

  • Depth to water table: More than 80 inches

  • Frequency of flooding: Rare

  • Frequency of ponding: None

  • Available water storage in profile: Moderate (about 8.3 inches)

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

  • Land capability classification (nonirrigated): 2e

  • Hydrologic Soil Group: B

  • Hydric soil rating: No

 


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