Corrigenda (51:2)
In the March 2016 issue Equations (1) and (2) were incorrect.
Two references were omitted:
Coulthard, M.A. (1979). Back-Analysis of Observed Spoil Failures Using a Two-Wedge Method. Division of Applied Geomechanics, CSIRO. Technical Report No.83, June 1979.
Gonano, L.P. (1980). An Integrated Report on Slope Failure Mechanisms at Goonyella – November 1976. Division of Applied Geomechanics, CSIRO. Technical Report No.114, October 1980.