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Full credit as soil saved is
give to local deposition because it is widely dispersed over the hillslope.
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Full credit is taken for
local deposition even though it does enrich the soil surface in coarse
particles.
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Only partial credit is taken
for remote deposition because it is concentrated in relatively small areas
away from the sediment source.
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Deposition at the lower end
of a concave slope does nothing for maintaining the upper part of the
slope. Even though sediment is
deposited at the lower end of the slope, the upper part of the slope is
permanently degraded by erosion.
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When sediment is trapped up
the slope, tillage tends to respread the deposited sediment some that benefit
of this deposition is realized, especially for lower portions of the slope.
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Thus, the credit given for
deposition depends on the amount and location of the deposition.
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In the case of terrace, the
credit also depends on spacing of the terraces. The credit is reduced as terrace spacing
becomes wide.
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