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...Appendix d testing geotechnical methods for karst feasibility the following information on bmp design and swm in areas has been adapted from carroll county water resource management manual ordinance ccwrm dated july a complete discussion of these items please refer to document section stormwater general runoff should not be concentrated conveyed through vegetated addition facilities designed accordance with standards detention retention ponds constructed synthetic or clay liner approved by local plan approval authority discharges directly impervious surfaces routed within feet edge any existing unremediated sinkhole flow then directed an area underlain carbonate rock alternatively may stable watercourse via pipe lined channel sinkholes occurring structures repaired hours first observation occurrence liners where natural soil permeabilities are greater than cm sec x inches per hour two foot interval below depth proposed facility low permeability shall installed as follows one less b c c...