What defines "non-perennial" water sources in Arizona?

"Non-perennial" water sources refer specifically to those that do not flow year-round. This definition is crucial within the context of Arizona's hydrological conditions, where many rivers and streams may dry up during certain seasons or in response to changes in climate, water management, or land use.

In contrast, perennial water sources remain active and flowing continuously throughout the year, which is not applicable to non-perennial sources. The other options suggesting that non-perennial sources are always frozen or contaminated do not accurately represent the essential characteristics of these water sources. Non-perennial water bodies may indeed contain water during certain periods, such as rain season or melting snow, but lack a consistent flow throughout the entire year.

Thus, recognizing the definition of non-perennial water sources is vital for understanding water availability, rights, and management in Arizona's arid environment.