Retention and removal of debris and pollutants from surface water runoff

A system to restrict and remove debris and pollutants from surface water runoff, comprising:

• a receptacle having a bottom, a peripheral sidewall, an open top, and a sump, said sidewall having an outlet port therethrough above said bottom, said receptacle being adapted for insertion into a surrounding area with said rim near the level of a contiguous area whereby to receive runoff water and debris carried by it;
• a grate mounted to said rim and extending across said grate having apertures theretbrough sized to restrict large debris and to pass water along with debris of lesser size;
• a first screen mounted to said receptacle, extending across said peripheral wall beneath said grate, said screen formed as a removable basket with a bottom, a peripheral sidewall and an open top, apertures formed through said bottom and sidewall which are sized to restrict at least some of the debris of lesser dimensions that were passed by said grate, and to permit flow of water therethrough into the sump along with some debris of still lesser dimensions;
• and
• a second screen extending laterally into said sump above and spaced from the bottom of the receptacle and directly beneath and spaced from said first screen, said second screen comprising a hollow porous body with a central, open drainage region, said second screen being mounted to said sidewall of said receptacle about said outlet port such that said open drainage region is in fluid communication with said outlet port, said second screen having pores sized to pass water, but to restrain at least some finer particles that were passed by said first screen, whereby water which flows through said second screen is substantially free of particles of objectionable size and can properly be discharged through said outlet port into a drainage system.