Does anyone have an opinion on drilling bore holes in shorter (less than 40 feet tall) earth dams? I have been told to avoid this practice at all costs as a hole in a dam is not a good thing! I suppose drilling in a clay core is one issue but a vertical small diameter hole drilled off the crest properly (tamped) backfilled should not be an issue. Getting past that, if holes are drilled, is there a preferred backfill method or material to use? Thanks for any input.
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