Manhole cover inflow test device

Details Manhole cover inflow test device Manhole cover inflow test device

1990-03-26

1991-07-23

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

73 38, G01F 100

Patent

active

050333100

ABSTRACT:
A test apparatus for measuring the rate (volume as a function of time) of surface water runoff infiltration inflow into a manhole that includes a portable liquid impervious barrier that can retain a predetermined volume of water and sized to extend and encompass a manhole cover and the manhole supporting structure, the barrier including a waterproof gasket along its base, and a liquid level measuring device positioned inside the barrier that can determine first and second liquid levels within the barrier as a function of time. When the liquid impervious barrier is filled with water, the device is actuated when a particular water level is reached. After liquid has infiltrated into the manhole structure, the level will drop in the barrier and when a predetermined low level is reached, the measuring device will compute the time lapsed and the volume that has left the barrier. The barrier also includes one or more apertures to ensure that a predetermined volume of liquid is in the barrier at the beginning of the test.

REFERENCES:
patent: 3548635 (1970-12-01), Hutchinson et al.
patent: 3861196 (1975-01-01), Domenighetti
patent: 4070903 (1978-01-01), Lees et al.

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