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The data was derived from NRCS and USDA: http://soildatamart.nrcs.usda.gov/USDGSM.aspx#TheDataset. The K Factor was derived from the above url. The data containing spatial and attribute soil was populated into a provided MS-Access database template with a provided ascii file. ArcMap was used with the provided shapefile "gsmsoilmu_a_ca.shp" and Soil Data Viewer. The Soil Data Viewer extension used "soildb_US_2002.mbd" as the database while "gsmsoilmu_a_ca.shp" was used as the map unit. Using Soil Data Viewer, the Soil Erosion Factor was set to "K Factor, Whole Soil". The options were set to Dominant Condition for aggregation method and 15% for Component Percent Cutoff. Finally the Surface Layer was selected under Soil Data Viewer layer options. The files listed above were provided by USDA-NRCS Soil Data Mart. Microsoft Access and Soil Data Mart were used to populate the information for the state.
Soil Data Viewer can be downloaded for free from: http://soils.usda.gov/sdv/download.html |
| summary:
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The data was derived from NRCS and USDA: http://soildatamart.nrcs.usda.gov/USDGSM.aspx#TheDataset. The K Factor was derived from the above url. The data containing spatial and attribute soil was populated into a provided MS-Access database template with a provided ascii file. ArcMap was used with the provided shapefile "gsmsoilmu_a_ca.shp" and Soil Data Viewer. The Soil Data Viewer extension used "soildb_US_2002.mbd" as the database while "gsmsoilmu_a_ca.shp" was used as the map unit. Using Soil Data Viewer, the Soil Erosion Factor was set to "K Factor, Whole Soil". The options were set to Dominant Condition for aggregation method and 15% for Component Percent Cutoff. Finally the Surface Layer was selected under Soil Data Viewer layer options. The files listed above were provided by USDA-NRCS Soil Data Mart. Microsoft Access and Soil Data Mart were used to populate the information for the state.
Soil Data Viewer can be downloaded for free from: http://soils.usda.gov/sdv/download.html |
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NaN |
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| description:
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The soil-erodibility factor K represents: (1) susceptibility of soil or surface material to erosion, (2) transportability
of the sediment, and (3) the amount and rate of runoff given a particular rainfall input, as measured under a
standard condition. Fine-textured soils that are high in clay have low K values (about 0.05 to 0.15) because the
particles are resistant to detachment. Coarse-textured soils, such as sandy soils, also have low K values (about
0.05 to 0.2) because of high infiltration resulting in low runoff even though these particles are easily detached.
Medium-textured soils, such as a silt loam, have moderate K values (about 0.25 to 0.45) because they are
moderately susceptible to particle detachment and they produce runoff at moderate rates. Soils having a high
silt content are especially susceptible to erosion and have high K values, which can exceed 0.45 and can be as
large as 0.65. Silt-size particles are easily detached and tend to crust, producing high rates and large volumes
of runoff. |
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| catalogPath:
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| title:
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K_Final_Update |
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| tags:
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["RUSLE","K-Factor","Soil Erodibility","Risk Factor"] |
| culture:
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en-US |
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NaN |
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