Underdrain for wastewater filtration container

An underdrain configured to be placed at a bottom of a wastewater container wherein the underdrain comprises:

• a base member, said base member having a bottom, said bottom of said base member being planar in manner having a first end and a second end, said base member having opposing lateral longitudinal edges, said base member having opposing lateral longitudinal leg members contiguously formed with said bottom extending upward from said opposing lateral longitudinal edges;
• a baffle member, said baffle member having a first end and a second end being equivalent in length to said base member, said baffle member being superposed above said base member forming a void therebetween, said baffle member being manufactured from four contiguous portions, said four contiguous portions consisting of two inner portions, said two inner portions being contiguous along a center seam of the baffle member and having an obtuse angle between the two inner portions, said four contiguous portions further consisting of two outer portions, said two outer portions being on opposing sides of said inner portions, wherein one of said two outer portions is contiguous with a first of said two inner portions having an acute angle between said one of said two outer portions and said first of said two inner portions, and wherein a second one of said two outer portions is contiguous with a second of said two inner portions on an opposing side of said baffle member and having an acute angle between said second one of said two outer portions and said second of said two inner portions;
• a top member, said top member being superposed a top end of said baffle member, said top member being planar in manner, said top member being equivalent in length to said baffle member, said top member having a multitude of apertures formed therein;
• a screen member, said screen member being semi-annular in shape, said screen member being operably coupled to said base member along said opposing lateral longitudinal edges, said screen member extending over said baffle member,
• wherein said baffle member is M-shaped.