Patent ID: 7677835

Claim:
A modular raintank structure comprising: a plurality of sidewall plate modules, said sidewall plate modules interconnected to form a box-shaped raintank with a hollow interior space; a plurality of cross plates extending within the hollow interior space of said raintank between opposing sidewall plate modules; each said sidewall plate module comprising a first planar member having an alternating pattern of support surfaces and openings, and a second planar member spaced from and substantially parallel to said first planar member, said second planar member having an alternating pattern of support surfaces and openings, with each opening of said second planar member being aligned with a support surface of said first planar member, and with each support surface of said second planar member being aligned with an opening of said first planar member; a plurality of joining members connecting the support surfaces of said first planar members to adjacent support surfaces of said second planar members; each of said cross plates including a skeletal framework of a plurality of interconnecting struts, said struts having openings therebetween; wherein water can freely flow into and out of said modular raintank through said openings of the first and second planar members and through the openings of the cross plates.