This 360' x 62' x 7' deep buried reservoir detains storm water runoff from the site and meters the discharge at a rate that does not impact the drainage system. The vault's capacity is approximately 1.1 million gallons to meet a 100 year storm design. In final configuration, the impact of such a large structure does not adversely affect the project since it is hidden below ground with a parking area above. The lid is constructed with 270 pieces of 12½" thick by 4' wide prestressed, precast untopped hollow core slabs. They span 20' and are designed to support HS25 truck loading and 2' of soil and asphalt cover.
