Abstract: A modular fluid capture system retains stormwater runoff beneath a ground surface. Internal components include columns and struts, while outer components include walls, ceilings, and/or floors. Load bearing vertical column components having column openings are spaced apart and/or stacked to form capture system layer(s). Elongated horizontal strut components install into the column openings to couple columns into an interconnected internal structure that distributes physical loads across all or most column components. Wall, ceiling, and/or floor components couple to this interconnected internal structure to form the outer walls, ceiling, and floor. The overall fluid retention volume is the overall volume within the walls, ceiling, and floor, minus the displacement volume of the internal components. This overall system fluid retention volume is substantially greater than the displacement volume.

Abstract: A modular fluid capture system retains stormwater runoff beneath a ground surface. Internal components include columns and struts, while outer components include walls, ceilings, and/or floors. Load bearing vertical column components having column openings are spaced apart and/or stacked to form capture system layer(s). Elongated horizontal strut components install into the column openings to couple columns into an interconnected internal structure that distributes physical loads across all or most column components. Wall, ceiling, and/or floor components couple to this interconnected internal structure to form the outer walls, ceiling, and floor. The overall fluid retention volume is the overall volume within the walls, ceiling, and floor, minus the displacement volume of the internal components. This overall system fluid retention volume is substantially greater than the displacement volume.