A chamber has an inlet for receiving polluted storm-water runoff and an outlet for the storm water to flow out. Within the chamber is a collection reservoir having an adjustable weir with a skimming edge for skimming off floating matter such as motor oil, other hydrocarbons, and detergents. In alternative embodiments, there are included a screen, one or more baffles, and/or a pivotal filter for further dispersing, detaining, and/or filtering the storm water.

 
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