Which of the following describes a Distribution System Small (DSS)?

A Distribution System Small (DSS) is characterized by its operational methods and configuration, particularly in terms of water storage and pressure management. The correct choice highlights that a DSS operates primarily using pressure tanks and storage tanks, which is a crucial aspect of its functionality.

In smaller distribution systems, pressure and storage management are essential for maintaining consistent water delivery to users, especially in communities where the demand may fluctuate. These systems rely on pressure tanks to ensure adequate water pressure for distribution, while storage tanks help manage peak usage demands and maintain supply during intermittent operational periods.

The other options describe scenarios that do not align with the defining characteristics of a DSS. For example, a system serving multiple water sources refers to a larger or more complex arrangement, which is not typical of small distribution systems. Similarly, serving only non-residents or focusing exclusively on rainwater collection does not encompass the broader operational framework of a DSS, which is designed to cater to various residential water needs through reliable pressurized systems and adequate storage.