Abstract: An apparatus for use in catch basin openings and being located on the inside peripheral edge of the storm sewer opening at or immediately below the point where storm water enters the catch basin opening. The apparatus includes at least one of trough located along the inside peripheral edge of the storm sewer opening. Each trough or trough section is located on the inside peripheral edge of the catch basin opening and discharges to at least one rigid sump. Each trough is positioned at or below the elevation of the point where the storm water would normally discharge down into the storm sewer and diverts the majority of this storm water and any debris into the rigid sump from at least one open end in each said trough. The rigid sump is cooperatively engaged with at least one trough to form a modular unit. It is envisioned that two modular rigid sump and trough combinations will interconnect to form one apparatus for each catch basin. Both trough and sump occupy a portion of the peripheral edge.