System and apparatus for controlling fluid flow in drainage systems

A fluid control system to control fluid flow out of an aperture of a wall, the fluid control system comprising:

• a float device coupled to a location on the wall above the aperture, wherein the float device has a spherical shape or an oval shape and includes a fluid-pervious feature, and wherein the float device has sufficient buoyancy such that at least a portion of the float device floats above a liquid;
• and
• a coupling mechanism being a tether, wherein the tether couples the float device to the location on the wall, wherein, while in a resting state, the fluid control device at least partially covers the aperture of the wall.

A fluid control system to control fluid flow within a drainage system, the fluid control system comprising:

• a float device having a spherical shape or an oval shape and including a fluid-pervious feature, wherein the float device has sufficient buoyancy such that at least a portion of the float device floats above a liquid, and wherein the float device partially restricts fluid flow from an aperture when in a resting state and allows fluid flow without restriction when in an open state, the open state being due to a flow rate of the fluid flow being at least a flow threshold;
• and
• a coupling mechanism being a tether, wherein the tether couples the float device to a structure of the drainage system.