Which of the following is considered a static water supply?

A static water supply refers to a body of water that does not flow and is typically used for firefighting or other purposes where a stable source of water is needed. The reason storage tanks, lakes, streams, and dry hydrants are categorized as static water supplies is that they hold water in a non-flowing state, allowing firefighters to draw from these sources as needed without pressure being supplied by pumps or other mechanisms.

In contrast, fire hydrants are attached to the pressurized municipal water system and thus do not qualify as static since they provide water under pressure. Similarly, pressurized water tanks are designed to maintain water under pressure for distribution and firefighting but are not considered static due to their operational mechanism. Ponds and swimming pools may seem like valid options at first glance, but they serve more passive roles and can be subject to evaporation and other changes, making the broader category of lakes and streams more fitting for static supply classifications.

Thus, selection of storage tanks, lakes, and streams as static water supply sources correctly captures the essence of what a static supply is, emphasizing its stability for use in emergency scenarios.