Filter

DETAILED DESCRIPTION The invention is a filter for a drainage basin comprising a filter bag formed with two sidewalls which are joined at their edges and with an open top so that when the sidewalls are separated a filter bag is formed through which water may pass.
A debris dam joined to the upper edge of one of the sidewalls fits into the overflow slot when the filter bag is positioned within a catch basin to prevent unfiltered runoff from entering the drainage basin through the curb overflow slot.
The filter bag is secured to be positioned under a drainage basin grate.
The sidewalls which constitute the boundaries of the filter bag are made of a semi-permeable geosynthetic material through which water may pass, however solid debris is trapped.
Rigid rebar handles are inserted in loops formed at the top of the sidewalls.
These handles remain above the drainage basin grate when the filter is in place to keep the filter bag in the proper position and to facilitate removal of the filter for cleaning or replacement.
Water, solid debris, and environmental contaminants flow through the drainage basin grate.
Solid debris and environmental contaminants are separated from the water, as the water is allowed to pass through the filter bag while the debris and other contaminants are trapped within the bag.
The debris dam prevents debris from entering the sewer system through the overflow slot.
The debris and contaminants accumulate in the filter bag until such time as the filter is removed and the contents dumped from the filter bag.
The filter may also be washed after removal.
The filter may again then be installed along the opening of the drainage basin.
One advantage of the present invention is that debris and contaminants may be prevented from entering a drainage basin without causing excessive impedance to the flow of water into the basin.
Another advantage of the present invention is that the filter can be easily installed, removed, and reused.
Yet another advantage of the present invention is that unfiltered water is prevented from entering the drainage basin through the curb overflow slot