Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1996-08-30
1998-07-14
Raevis, Robert
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
057807205
ABSTRACT:
A self-contained outflow meter for resting on pavement and measuring the rate of water drainage from the pavement. The outflow meter includes a vertical tube for containing water and having a bottom water discharge end sealed by a rubber sealing ring. A spring-loaded plunger is suspended from a cap mounted on the upper end of the tube for selectively sealing a water discharge opening provided in the base. Upper and lower float switches are suspended from the cap into the tube and include upper and lower switch floats, respectively, which are vertically displaceably mounted. A timer is provided on the cap and is wired to the float switches. The base is placed on the pavement surface with the plunger sealing the water discharge opening and water is poured into the tube. As the water level exceeds the respective levels of the switch floats, the floats are displaced upwardly. The plunger is then released, allowing the water to flow from the tube through the discharge opening onto the pavement and under the sealing ring on the base. The floats are sequentially displaced by gravity and the timer records the elapsed time of water flow between the float switches and from the tube, thus indicating the rate of water drainage from the pavement.
REFERENCES:
patent: 4164139 (1979-08-01), Jones
patent: 4341110 (1982-07-01), Block
patent: 5079950 (1992-01-01), McKiernan et al.
Outflow Meter Manual, Engineering Services Div. of Fed.Hwy. Admin. Sep. 1978.
Harrison John M.
Raevis Robert
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