a frame for retaining a grate over a trench for directing storm water to subterranean basins includes a frame that is embedded in the concrete surrounding the trench . the frame includes a support member , including a vertical support that is sized and dimensioned to abut the wall of the trench , and a horizontal flange that is cantilevered over the trench to receive a grate member . the frame further includes a reinforcement member that runs parallel to the length of the support member , and a plurality of rib members that couple the reinforcement member to the support member . the reinforcement member and rib members are embedded in the pavement adjacent the trench , to provide a back structure for reinforcing the support of the grate .