For form or function reasons, Preload’s prestressed concrete tanks are often constructed with a reinforced concrete, flat-slab roof. The flat-slab roof is supported by circular columns, each with a footing sized for the allowable soil-bearing capacity. Column capitals or drop panels are employed, compatible with the roof design. Our flat-slab roofs are sloped to meet local or project requirements and designed in accordance with provisions of the AWWA D110 Standard.