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| Rule
of Thumb for Deposition |
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| Beginning on Concave Slopes |
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| Average steepness
of |
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| concave portion |
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| Example: |
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| Assume average
slope of |
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| concave section =
10% |
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| ½ of 10% is 5% |
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| Deposition begins
at location |
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| where the
steepness is 5% |
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| Deposition begins at
location |
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| where steepness =
½ average |
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| steepness of
concave portion |
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| Deposition begins |