Abstract: A synthetic resin article is provided for use in a fluid diversion system with one or more distribution lines. The article's frame has a top, at least one side, a bottom and an interior. At least one aperture is formed at the top. An intake port is disposed on at least one side of the frame, for engagement with the system distribution line. A drainage structure is disposed on the bottom of the frame for downward drainage of standing water into the surrounding soil or other environment. When the system delivers fluid through the distribution line, it is received in the interior of the frame and drains slowly out through the drainage structure but normally when the system delivers fluid to the interior at a sufficient rate, the fluid rises to the top of the frame and percolates out of the outlet aperture. In preferred embodiments, the top includes a plurality of small outlet gratings for additional percolation.