Whether a site requires a single tank or several tanks, the design flexibility of ZCL | Xerxes fiberglass tanks makes them ideal for storm water applications. Our watertight, corrosion-resistant tanks, with integral ribs, are designed to withstand H-20 and H-25 axle loads, and are not limited by burial depth. Easy to ship and install, they require no ongoing maintenance. Single tanks are available in capacities up to 60,000 gal and up to 12 ft in diameter.