The depth za may be reduced to 2m if the wall is built on

competent strata1 with 'distinct' Figure 11.1. Recommended depth of (i.e. known) ge°l°gy. With investigation points for excavations 'indistinct' geology, at least one borehole should go to at least 5m.

If bedrock is encountered, it becomes the reference level for za.

Greater depths of investigation may be needed for very large or highly complex projects or where unfavourable geological conditions are encountered. [EN 1997-2 §B.3(2)NOTE and B.3(3)]

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