Official Series Description


Lab Data Summary

Aggregate lab data for the TRAWICK soil series. This aggregation is based on all pedons with a current taxon name of TRAWICK, and applied along 1-cm thick depth slices. Solid lines are the slice-wise median, bounded on either side by the interval defined by the slice-wise 5th and 95th percentiles. The median is the value that splits the data in half. Five percent of the data are less than the 5th percentile, and five percent of the data are greater than the 95th percentile. Values along the right hand side y-axis describe the proportion of pedon data that contribute to aggregate values at this depth. For example, a value of "90%" at 25cm means that 90% of the pedons correlated to TRAWICK were used in the calculation. Source: KSSL snapshot . Methods used to assemble the KSSL snapshot used by SoilWeb / SDE

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Pedons used in the lab summary:

MLRALab IDPedon IDTaxonnameCINSSL / NASIS ReportsLink To SoilWeb GMap
133B87P008386TX347009Trawick6Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties31.5769444,-94.5602798
133B89P009588TX225002Trawick7Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties31.5666676,-95.3305588
133B88P010288TX225004Trawick7Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties31.5699997,-95.351387

Water Balance

Monthly water balance estimated using a leaky-bucket style model for the TRAWICK soil series. Monthly precipitation (PPT) and potential evapotranspiration (PET) have been estimated from the 50th percentile of gridded values (PRISM 1981-2010) overlapping with the extent of SSURGO map units containing each series as a major component. Monthly PET values were estimated using the method of Thornthwaite (1948). These (and other) climatic parameters are calculated with each SSURGO refresh and provided by the fetchOSD function of the soilDB package. Representative water storage values (“AWC” in the figures) were derived from SSURGO by taking the 50th percentile of profile-total water storage (sum[awc_r * horizon thickness]) for each soil series. Note that this representation of “water storage” is based on the average ability of most plants to extract soil water between 15 bar (“permanent wilting point”) and 1/3 bar (“field capacity”) matric potential. Soil moisture state can be roughly interpreted as “dry” when storage is depleted, “moist” when storage is between 0mm and AWC, and “wet” when there is a surplus. Clearly there are a lot of assumptions baked into this kind of monthly water balance. This is still a work in progress.

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Sibling Summary

Siblings are those soil series that occur together in map units, in this case with the TRAWICK series. Sketches are arranged according to their subgroup-level taxonomic structure. Source: SSURGO snapshot , parsed OSD records and snapshot of SC database .

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Select annual climate data summaries for the TRAWICK series and siblings. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data .

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Geomorphic description summaries for the TRAWICK series and siblings. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats. Proportions can be interpreted as an aggregate representation of geomorphic membership. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Small Shannon entropy values suggest relatively consistent geomorphic association, while larger values suggest lack thereof. Source: SSURGO component records .

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There are insufficient data to create the 3D mountains figure.

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There are insufficient data to create the 3D flats position figure.

Competing Series

Soil series competing with TRAWICK share the same family level classification in Soil Taxonomy. Source: parsed OSD records and snapshot of the SC database .

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Select annual climate data summaries for the TRAWICK series and competing. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data .

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Geomorphic description summaries for the TRAWICK series and competing. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Proportions can be interpreted as an aggregate representation of geomorphic membership. Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Shannon entropy values close to 0 represent soil series with relatively consistent geomorphic association, while values close to 1 suggest lack thereof. Source: SSURGO component records .

Click the image to view it full size.

Click the image to view it full size.

There are insufficient data to create the 3D mountains figure.

There are insufficient data to create the 3D terrace figure.

There are insufficient data to create the 3D flats position figure.

Soil series sharing subgroup-level classification with TRAWICK, arranged according to family differentiae. Hovering over a series name will print full classification and a small sketch from the OSD. Source: snapshot of SC database .

Block Diagrams

Click a link below to display the diagram. Note that these diagrams may be from multiple survey areas.

  1. TX-2010-11-03-38 | Houston County - 2002

    Typical pattern of soils and parent material in the Alto-Trawick general soil map unit (Soil Survey of Houston County, Texas; 2002).

  2. TX-2010-11-04-19 | San Augustine and Sabine Counties -

    Nacogdoches-Trawick-Alto association (Soil Survey of San Augustine and Sabine Counties, Texas).

Map Units

Map units containing TRAWICK as a major component. Limited to 250 records.

Map Unit Name Symbol Map Unit Area (ac) Map Unit Key National Map Unit Symbol Soil Survey Area Publication Date Map Scale
Trawick and Bub soils, moderately steepTmF38089575171m9hxtx00119701:20000
Trawick fine sandy loam, 2 to 8 percent slopesTkD6905575169m9hvtx00119701:20000
Trawick fine sandy loam, 8 to 20 percent slopesTkF36625751702tnjftx00119701:20000
Trawick-Bub complex, 8 to 40 percent slopesBt3719457532030d15tx07319491:20000
Trawick fine sandy loam, 8 to 20 percent slopesNh202685753572tnjftx07319491:20000
Trawick fine sandy loam, strongly sloping, erodedNk11151575358m9pytx07319491:20000
Trawick clay loam, sloping, erodedNc631575352m9prtx07319491:20000
Trawick clay loam, strongly sloping, erodedNd534575353m9pstx07319491:20000
Trawick gravelly fine sandy loam, 12 to 20 percent slop es394274367630dbk1tx21319781:20000
Trawick fine sandy loam, 5 to 15 percent slopesTrE12846575556m9xbtx22519941:24000
Trawick gravelly fine sandy loam, 2 to 5 percent slopesTwC1703575557m9xctx22519941:24000
Trawick-Bub complex, 15 to 40 percent slopesTxG132857555930n21tx22519941:24000
Trawick gravelly fine sandy loam, 5 to 15 percent slopesTwE755575558m9xdtx22519941:24000
Trawick-Bub complex, 8 to 20 percent slopesTxE861936924130n22tx28919851:24000
Trawick fine sandy loam, 1 to 5 percent slopesTrB3943369240dd6ztx28919851:24000
Trawick clay loam, 8 to 20 percent slopes6317523575676mb16tx34719761:24000
Trawick fine sandy loam, 8 to 20 percent slopes61144115756742tnjftx34719761:24000
Trawick-Bub complex, 8 to 40 percent slopes64327957567730d15tx34719761:24000
Trawick gravelly fine sandy loam, 8 to 20 percent slopes622591575675mb15tx34719761:24000
Trawick-Urban land complex, 8 to 20 percent slopes651188575678mb18tx34719761:24000
Trawick gravelly clay loam, 5 to 15 percent slopesTuD16802189476321lndtx61920071:24000
Trawick clay loam, 15 to 35 percent slopesTuG771189476621lnhtx61920071:24000

Map of Series Extent

Approximate geographic distribution of the TRAWICK soil series. To learn more about how this distribution was mapped, or to compare this soil series extent to others, use the Series Extent Explorer (SEE) application. Source: generalization of SSURGO geometry .