Closure to “Stability of Long Trenches in Sand Supported by Bentonite-Water Slurry” by George M. Filz, Tiffany Adams, and Richard R. Davidson.

The article focuses on the comments made to the study entitled "Stability of Long Trenches in Sand Supported by Bentonite-Water Slurry." It agrees with the comment that for this type of construction, three-dimensional safety factors are better than two-dimensional safety factors. It states the importance of three-dimensional effects. It also agrees to the suggestion on the development of analytical solutions for factors of safety applicable to instances where there is no formation of filter cakes.