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Tuesday, January 26 • 2:40pm - 3:00pm
Restoring Wetland Hydrology – A Novel Method For Closing Drainage Tile

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AUTHORS: Ray Finocchiaro*, U.S. Geological Survey – Northern Prairie Wildlife Research Center; Dave Azure, U.S. Fish and Wildlife Service; Brian A. Tangen, U.S. Geological Survey – Northern Prairie Wildlife Research Center; Charles F. Dahl, U.S. Geological Survey – Northern Prairie Wildlife Research Center

ABSTRACT: The restoration of wetland hydrological processes commonly includes the dismantling or disruption (closing) of a drainage tile system constructed to facilitate removal of soil water from the area. Current closing methods typically involve heavy construction equipment for the removal or destruction of the belowground tile infrastructure. Such methods can alter soil properties (e.g., infiltration, bulk density) that are critical for wetland processes. Additionally, performance of current closing methods may be hindered by operation costs, site accessibility, and in cases of working in or near satiated soils, may be confined to periods when soil moisture conditions are suitable for heavy equipment traffic and excavation. A novel method using expanding foam is being field tested for the restoration of tiled wetlands in the Prairie Pothole Region of the northern Great Plains. This method offers less soil disturbance, costs, limitations because of site conditions or accessibility, and more flexibility for hydrologic restoration strategies. Use of expanding foam affords a lasting, complete termination of the tile’s drainage function within minutes even in the presence of water with virtually no voids and can actually help stabilize the soil around the tile (i.e., slotted tile pipe), which reduces transmission of water along the outside of the tile. Application of the foam to the inside of the tile is relatively easy with trial application distances exceeding 76 m. The foam product is currently used by Federal and State agencies (e.g., Department of Transportation) for infrastructure repairs and is NSF/ANSI 61 certified for potable water.

Tuesday January 26, 2016 2:40pm - 3:00pm EST
Ambassador W