Excerpt
PEOPLE who attempt to use the wind erosion equation (1) to estimate soil loss often experience the inconvenience of evaluating the E4 factor in the equation, particularly when the information appears in a textbook or other publication. A moveable scale must be cut from a page in the textbook or publication and moved on the vertical axis of a graph to complete the estimation. The moveable scale can then be misplaced or soon wears out through repeated use. Such disadvantages limit the application of graphical solutions to the equation.
To overcome these disadvantages, the moveable scale can be placed on the horizontal axis of a graph. A group of lines inclined 45° are used to deflect any value on the horizontal axis to any desired location on the vertical axis. Such an arrangement is equivalent to moving the moveable scale on the verticle axis, thereby eliminating the moveable scale from the estimaton procedure. This graphical aid should encourage use of the wind erosion equation to estimate soil loss.
Seven steps
1. Follow the procedure described by Neil Woodruff and Frank Siddoway (1) to obtain the values of Ez and El.
2. Enter the value of Ez on the vertical axis and the value …
Footnotes
Shu-Tung Chu is a professor, Department of Agricultural Engineering, South Dakota State University, Brookings, South Dakota 57007. This manuscript is published with the approval of the director of the South Dakota Agricultural Experiment Station as journal article No. 1996.
- Copyright 1985 by the Soil and Water Conservation Society
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