Use of In-Stream Water Quality Measurements and Geospatial Parameters to Predict Consumer Surfactant Toxic Units in the Upper Trinity River Watershed, Texas Page: 58
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Results
The K Factor for the UTRW is shown in Figure 3-14. Though there were wide
distributions of soils with different K Factor values in the UTRW, there were distinct
patterns along defined ecoregion boundaries. The Western and Eastern Cross Timbers
tended to have soils with higher K Factor values, perhaps due to the sandy and sandy
loam substrates and topology slopes. The Grand Prairie and Blackland Prairie
ecoregions, on the other hand, had consistently moderate K Factor values representing
fertile soil (fine-textured, clayey soils) that were moderately susceptible to detachment.
In the Post Oak Savannah, south of the Blackland Prairie, K Factor values increased in
the higher elevations (sandy and sandy loams) yet remained moderate in the low-lying
areas (clay and clay loams).
Similar to the soil organic matter values, the size of the subwatersheds tended to
moderate the high and low K Factors within the subwatersheds. Averaged K Factor
values for subwatersheds ranged from 0.26 to 0.34 (Table 3-6 and Figure 3-15). The
lowest value was seen in Subwatershed 4 and the highest value was seen in
Subwatershed 1. Also similar to the organic matter values was the fact that
Subwatersheds 3 and 4 had artificially low average organic matter values due to what
appears to be incomplete soil data for Archer and Parker Counties. If Parker County
soil values were more accurate, Subwatershed 4 might have had a higher average K
Factor value due to a significant amount of subwatershed residing in the Western Cross
Timbers ecoregion.58
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Johnson, David Richard. Use of In-Stream Water Quality Measurements and Geospatial Parameters to Predict Consumer Surfactant Toxic Units in the Upper Trinity River Watershed, Texas, thesis, May 2008; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc6091/m1/74/: accessed May 1, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .