This table is based on over 40 years’ experience by the authors’ practice. Where exceptionally large depressions are anticipated, e.g. due to the presence of old mine workings, swallow-holes, pipes and sink holes, their size must be determined from ﬁrst principles.
(2) The design span for local depressions is established from Fig. 13.5, based on the local depression diameter and the depth of compacted hardcore or granular ﬁll.
|Table 13.1 Design diameter for local depressions|
|Fig. 13.5 Design span of local depressions. For soil classiﬁcations see Table 13.1.|