|colspan = 2|The Curves table is designed to accommodate ponds of roughly conical dimensions. A rainwater cistern is usually cuboid or cylindrical in shape, so that the area (m<sup>2</sup>) will remain the same throughout the depth. Instead, the dimensions of the rainwater cistern can be placed into the fields: | |colspan = 2|The Curves table is designed to accommodate ponds of roughly conical dimensions. A rainwater cistern is usually cuboid or cylindrical in shape, so that the area (m<sup>2</sup>) will remain the same throughout the depth. Instead, the dimensions of the rainwater cistern can be placed into the fields: |