What is the most significant source of surface water in Texas?

The most significant source of surface water in Texas is precipitation that falls within the state. Texas experiences a varied climate, resulting in diverse precipitation patterns across different regions. This rainfall is crucial as it replenishes rivers, lakes, and streams, which make up the surface water resources.

Reservoirs, while important for water storage and management, are ultimately reliant on the precipitation that fills them. Groundwater is another vital resource, but it is categorized separately. Desalination plants play a role in providing water, especially in arid areas, but they do not significantly contribute to the surface water supply when compared to the natural precipitation cycle. Understanding the role of precipitation highlights its fundamental importance in sustaining the surface water ecosystems of Texas.