Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent
1992-06-22
1993-06-15
Taylor, Dennis L.
Hydraulic and earth engineering
Drainage or irrigation
Porous or apertured pipe, flume, or tileway
405 36, 405 45, E02B 1100, E02B 1300
Patent
active
052192431
ABSTRACT:
The hydrology of a "perched water table" soil profile is regulated by installing a simple subsurface air-pipe system in the gravel layer of the soil profile to uniformly control the air pressure under the turf and to adjust the equilibrium condition between the capillary rise and the gravitational forces on the water in the soil. The air pipe system includes perforated pipes extending horizontally through the gravel layer of the soil profile at regular, spaced-apart intervals. The pipes are located adjacent the gravel layer/choker layer interface in vertical alignment with each drain pipe in the water drainpipe trench(es). The pipes are oriented such that the perforations extend along one (or both) sides of the pipe. A vacuum is applied to the pipes and the air is withdrawn uniformly across the gravel layer and the choker layer. According to one aspect of the invention, the air pressure difference across the rootzone acts as an additional force assisting gravity in the extraction of water from the rootzone. According to another aspect of the invention, sub-atmospheric pressure in the gravel layer is provided by the air pipes to increase the driving force of the water through the soil.
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Taylor Dennis L.
The Ohio State University
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