How many inches of sand are required when a 20,000-gallon water bladder is placed on rocky or uneven surfaces?

When placing a 20,000-gallon water bladder on rocky or uneven surfaces, the correct amount of sand required is 2 inches. This is recommended to create a stable and protective base for the bladder. The sandy layer acts to absorb irregularities in the underlying surface, helping to distribute the weight of the bladder evenly and preventing punctures or damage.

A 2-inch layer is generally sufficient to provide this support while also allowing for drainage, which reduces the risk of water accumulating underneath the bladder. This careful consideration in ground preparation is vital to ensure the bladder's integrity and functionality, especially when it's deployed in less-than-optimal conditions where there might be sharp or jagged rocks that could compromise its structure.