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Aerobic Wetland: 1

Aerobic Wetland: 1

Treatment Technology: 
Limestone Diversion Well
Quantity of Elements: 

Located just north of the old stone arch railroad bridge over Rausch Creek is believed to be the first limestone diversion well ever to be built in the United States. Patterned after a Swedish design, construction of the original circular well was begun in 1986 by the Dauphin Chapter of Trout Unlimited in conjunction with the PA Cooperative Fish & Wildlife Unit of Pennsylvania State University. The second (square) well was completed in 2000 by volunteers of Trout Unlimited’s Doc Fritchey Chapter, successor to the Dauphin Chapter.

The term “diversion” refers to the fact that part of the flow to be treated is diverted from the main stream channel. “Well” refers to the physical structure temporarily containing water diverted from the stream channel. Located approximately 100 yards upstream of the wells are two intake pipes which feed the water through nozzles into the wells with sufficient force to pulverize the bed of limestone gravel. The intakes are positioned such that only the circular well functions year round, and the square well is activated only during periods of high stream flow. The highly alkaline limestone particles reenter the main stream channel and chemically react to neutralize acidic water originating upstream from old coal mine drainages and acid precipitation from rainfall.

This excerpt is taken from Doc Fritchey Chapter Trout Unlimited's webpage How the Rausch Creek Diversion Wells Work