Limestone Channel Bars

Limestone channel bars on a tributary to Swatara Creek, PA
Limestone channel bars have been constructed by combining limestone gravel and sand. These particular channels washed out in a fairly small flood.

Open Limestone Channels (not pictured)
Open Limestone channels (not pictured) made of cobble-sized limestone are best used in steep terrain with oxygenated water.
The limestone gets coated by iron or aluminum hydroxides, but some limestone dissolution still occurs.

These methods are most effective for streams that have low pH, but also relatively low dissolved metal concentrations. Iron and/or aluminum hydroxides precipitate in the stream, but probably over a shorter stretch than without treatment.

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