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If the liquefaction point SZV is situated landwards of the observation point Ssign, the criteria is not met, which means that the global Global check PASSES.
If the liquefaction point SZV is not situated landwards of the observation point Ssign, the criteria is met, so go to step 1c.
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In case of natural deposited slopes, go to step 1d.
Step 1d: Flow slide possible based
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on the criteria of "the steepest slope over 5 m" ?
If the previous step (step 1c) has not been passed, a check on criteria of occurrence (“optredingscriterium”) must be performed.
The occurrence of flow slide is possible if one of the two following conditions if the following condition is met:
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the average slope is steeper than or equal to 1:4, over a height of at least 5 m
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.
If the criteria of occurrence is met, both Global and Overall checks FAIL and it should be switched to Advanced methods.
If the criteria of occurrence is not met, go to step 1e.
Step 1e: Flow slide possible based on average geometry ?
If the previous step (step 1d) has not been passed, a check on the average geometry must be performed.
The occurrence of flow slide is possible if one of the two following conditions is met:
- The total slope (channel edge-channel bottom) is on average steeper than or equal to 1:7.
- Breaching is possible (see paragraph below called "Breaching criteria")
If the criteria of occurrence is met, the Global check FAILS and it should be switched to the Detailed method.
If the criteria of occurrence is not met, go to step 5.
Step 6: Are there layers present with a thickness of minimal 5 m, in which D50 < 200 μm or D15 < 100 μm averaged over a thickness of 5 m?
The answer is "Yes" if D50 < 200 μm or D15 < 100 μm
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the Global and the Overall checks SUCCEED.
Breaching criteria:
This criterion corresponds to step 5 of CUR Aanbeveling 113, 2008.
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If so then the slope is breaching sensitive, so the check FAILEDfails, so a Detailed check is needed. In the case the slope height is over 40 m a Detailed check is also needed.
If not then the check SUCCEEDED.
Different cases are considered to determine the critical slope:
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