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This dam separates a former part of a roadway from one that is
still in use. In front of that dam a lot of mud has settled down, as it is
clearly visible in this photo. Usually the pipes in the dam are used for checking the
part of the roadway that is no longer in use concerning the concentration of
methane gas etc.. In this case the dam has been built after that the colliery
was closed in order to make the water spread in all former roadways in the same
way.
©
Richard Binder
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