19. Insufficient flatness of a slope either at the time of excavation or after exposure to meteorological influences.
20. The strain upon the face from lumps of earth being allowed to remain upon a slope during the construction of the works, or the gullet being excavated for a considerable distance in advance; the cohesion of the soil being thereby unduly and unequally strained.
21. By overweighting.
22. By unequal loading.
23. The establishment of spoil banks upon the cess, or the additional loading of the ground near and outside a railway fence, in soft soils having practically no cohesion or tenacity.
24. The excavation removed destroying the continuity of support, especially in soils partaking of a semi-fluid character.
25. The want of uniformity of the covering of a slope causing unequal percolation or exudation of water.
26. The neglect to fill up, or otherwise remedy, cracks or fissures in the slopes or cess.
27. By artificial or irregular consolidation either of the formation or slopes superinducing movement and weathering in any portion not so compacted.
28. From an accumulation of water behind a retaining wall at the foot of a slope, resulting in the stability of the wall being overcome by pressure.