Rainstore3 is a modular and stackable structure used to store storm water underground. Made from injection molded recycled plastic, a single panel contains 36 vertical columns and exceeds H-20 loading, allowing the construction of driving areas, parking lots or other small structures above the system. Built-in compression fittings and a variety of depths from 4-in. to 7.9 ft permit design flexibility. All Rainstore3 units are shipped pre-assembled for a drop-in ease of installation.