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The Universal Soil Loss Equation (USLE) is a widely used mathematical model that describes soil erosion processes. [1]Erosion models play critical roles in soil and water resource conservation and nonpoint source pollution assessments, including: sediment load assessment and inventory, conservation planning and design for sediment control, and for the advancement of scientific understanding.
In its early stages of development, soil loss tolerance rates were inconsistent because they were obtained based on rough estimates. From 1961 to 1962, several groups of soil in the United States were designated with T rates ranging from 2 to 6 tons per acre per year. The rate was subsequently adjusted to 1 to 5 tons per acre per year. [5]
In the United States and Canada, floor space ratio (FSR) and floor area ratio (FAR) are both used. [10] Use ratios are used as a measure of the density of the site being developed. High FAR indicates a dense construction. The ratio is generated by dividing the building area by the parcel area, using the same units.
Summary of hydrologic and physical properties of rock and soil materials as analyzed by the Hydrologic Laboratory of the U.S. Geological Survey 1948-1960. U.S. Geological Survey Water Supply Paper 1839-D. 42 p. De Wiest, R. J. (1966). On the storage coefficient and the equations of groundwater flow.
The total coverage by impervious surfaces in an area, such as a municipality or a watershed, is usually expressed as a percentage of the total land area. The coverage increases with rising urbanization. In rural areas, impervious cover may only be one or two percent.
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It’s tamale time. This Mexican comfort food has a long history and is an essential part of every major holiday, particularly Christmas. It’s also the perfect portable snack for holiday travelers.
In California, this coverage is offered through the California Earthquake Authority. Sinkhole coverage: Sinkholes occur in many regions of the U.S. but are not covered by a standard homeowners policy.
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