Abstract: Apparatus for optimizing fluid flow while maximizing selective filtration of select debris and detritus functions as catch basin in conjunction with conventional sewers. Proximate to a curb inlet a diverter is located, and at least one sieve-member or element is disposed within the catch basin defining a primary and supplemental space for collecting solid materials, in combination with a drain access aperture allowing for ingress and egress to the supplemental space from the primary space to preclude blockage by facilitating access to the catch basin drain.

Abstract: Novel enhanced catch basin constructions, especially for use with conventional sewers, feature a supplemental maintenance access hatch, which, when combined with a diverter and a sieve-like screen element facilitate ready access to and removal of trash/debris/detritus lodged proximate to an outlet drain or bottom of a catch basin to maintain a continuous flow path and preclude blockage. Readily removable covers for the supplemental maintenance access hatches allow workers, tools or later developed extraction schemes to maintain flow through both primary and supplemental debris collection spaces in catch basins. Methods of constructing and using the same feature these novel mechanisms.