A fluid management system can include a first chamber, a diffusion plate positioned in the first chamber configured to receive fluid and to direct the fluid along a bypass fluid flow path or a primary fluid flow path, a riser pipe positioned within the first chamber that conveys fluid from the diffusion plate into a second chamber, and a filtering apparatus positioned in the second chamber. The filtering apparatus can include a plate having a first opening, one or more modules coupled to the plate having one or more perforations and a second opening corresponding to the first opening, and filter media disposed adjacent to the one or more modules, and a slab positioned above the filtering apparatus.

A filtration apparatus includes: a filtration tank; a layer of filter medium disposed in an interior of the filtration tank, the layer of filter medium being used to pass supplied raw water therethrough from bottom to top to filter the raw water; and a filter medium washing device having a helical screw placed upright in the layer of filter medium and a screw driving unit configured to rotate the screw about a screw axis, the filter medium washing device being configured to rotate the screw to scrub and wash the filter medium. The filter medium washing device, which does not include an outer cylinder surrounding the screw, is further configured to transport the filter medium upward in a state in which an outer peripheral edge of the screw is in direct contact with the layer of filter medium.