Applicability  
When considering the use of cisterns in a rainwater collection system, one must consider cost, site conditions, scale issues, installation requirements, intended purpose of water collected, the quality of rainfall in the area, and the climate.

The cistern is the primary expense of a rainwater collection system. A well designed rainwater collection system, which provides the water needs of a home, can cost the same as putting in a well. The operating expenses of the rainwater system are less. Cisterns work best in areas where a well can not be dug.