| These watershed restoration projects include remediation of abandoned mine drainage through the construction of treatment systems. Treatment systems can be constructed as passive or active (or semi-active). Passive systems do not use electricity to function and are low maintenance. Examples of passive treatment include Anoxic Limestone Drains and Constructed Wetlands. Active systems may include mechanical parts and electrical use, may need to be monitored more regularly than passive systems to ensure proper function, and typically require more maintenance than passive systems. The type of treatment system that is best for a particular project depends on the chemistry and flow rate of the drainage. Treating abandoned mine drainage reduces detrimental impacts to receiving surface waters, improving water quality for human and wildlife use. |
