Liquid purification or separation – Structural installation – Geographic
Reexamination Certificate
2000-05-23
2001-11-13
Upton, Christopher (Department: 1724)
Liquid purification or separation
Structural installation
Geographic
C210S254000, C210S283000, C210S289000, C210S293000
Reexamination Certificate
active
06315897
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to the art of water purification and more particularly to a filtering system for treating rain water run-off.
The Chesapeake Bay is in crisis because of pollutants from a variety of sources. A major contributor to bay pollution is rain water which runs off of large buildings roofs and parking lots during a storm. Heavy rains rinse these surfaces of accumulated contaminants, flushing them quickly into the bay through storm sewers designed to handle heavy flow rates.
Riparian owners downstream of commercial developments note increased stream volume and flooding during storms. Such areas are designed to shed water, rather than permitting it to soak into the ground where it falls. The effect is the antithesis of a pond system, which catches moderate runoff and allows it to soak into the ground without flooding nearby streams.
It would be beneficial to riparian owners, and, we believe, to the environmental health of the bay, to simulate a pond system in highly developed areas where open ponds are impractical.
Prior inventors have developed a number of water treatment tanks, for example oil-water separators, many containing an aggregate for coalescing oil, or other purpose. This invention is not aimed so much at oil separation as flow control and phosphorus removal. Nevertheless, patents such as U.S. Pat. Nos. 3,962,084, 4,783,272, 4,985,148, 5,017,044, 5,073,261, 5,204,000, 5,330,651, 5,50,132 and 5,503,747 are of interest.
SUMMARY OF THE INVENTION
An object of the invention is to accumulate water during heavy rains, and release it slowly, to reduce peak run-off volume.
Another object of the invention is to reduce pollutant levels in rain water run-off.
A further object of the invention is to provide a simulated pond with the ability to handle unusually heavy flow volumes.
These and other objects are attained by a rain water run-off filtering system comprising one or more large-volume tanks installed below ground at a shopping center or the like, for receiving run-off from building roofs, parking lots and the like during storms, and releasing the water accumulated to a storm sewer system over time.
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Eastern States Associates
Shoemaker and Mattare
Upton Christopher
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