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*Use of [[permeable paving]] within the roadway is not economical when there are adjacent [[swales]] to filter and infiltrate runoff
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*Use of [[permeable pavements]] within the roadway is not economical when there are adjacent [[swales]] to filter and infiltrate runoff
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*[[Bioswales]] or the use of [[perforated pipes]] beneath grass swales can reduce the nuisance problems associated with conventional swales like standing surface water and steep slopes
*[[Bioswales]] or the use of [[perforated pipes]] beneath grass swales can reduce the nuisance problems associated with conventional swales like standing surface water and steep slopes