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How much soil rainfall removes per hectare in a year, and the effect of cover and terracing.
Pre-sizing and estimating tool: the results do not replace a design, calculation, or report signed by a qualified professional, nor verification against the applicable standards.
Annual loss for different C factors, with the other factors held constant.
Annual loss for different slopes, with the slope length you entered.
Drag the controls to simulate data different from what you entered (from 30% less to 30% more) and watch the result change instantly.
Soil loss (t/ha/year) for combinations of slope and slope length, with the other factors entered. Values marked with an asterisk exceed the tolerable loss.
The calculation done in steps, with the values you entered.
The calculation memo gathers this page's inputs, results, equations, assumptions, and references, with fields for project, responsible person, and review. The full report also includes the charts and interpretations, in color. In the print window, choose Save as PDF.
Enter the rainfall erosivity (R), the soil erodibility (K), the slope length and gradient of the land, the cover management (C), and the conservation practices (P). The calculator estimates the annual soil loss and compares it with the tolerable loss.
R = 7,000 MJ·mm/(ha·h·year), K = 0.03, slope length of 100 m, slope of 6%, C = 0.10 and P = 1.0.
LS = 1.10 (6% gradient on a 100 m slope). A = 7,000 × 0.03 × 1.10 × 0.10 × 1.0 = 23.1 t/ha/year.
With a tolerable loss of 10 t/ha/year, the example is above the limit: cover or practices need to improve.
It depends on the soil and the effective depth. Brazilian studies often use reference values between 5 and 12 t/ha/year; confirm the value with the local technician.
From the P factor (contour planting, terraces and vegetation strips), with tabulated values. Well-applied practices reduce P and, so, the loss.
Important notice: the Agrocalcs tools make estimates and preliminary sizing based on the data entered and on published engineering methods. They do not replace a design, a calculation report or a report signed by a qualified professional (CREA/ART), nor verification against the applicable technical standards and legislation, such as the Regulatory Standards of the Ministry of Labor. Material and fuel properties vary: check with the manufacturer or with analyses of your process before deciding. By using the site, you agree to the Terms of Use.
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