How do exorheic drainage systems carry water to the ocean?

Exorheic drainage systems are open systems where surface waters are transported to the ocean through well-defined networks of streams and rivers.1

These systems function as part of the global hydrologic cycle, where water that precipitates over continental landmasses—and does not evaporate—drains into the sea. The movement of water through these systems is facilitated by the following processes:1

• Channelized Flow: Water flows through drainage basins, which are areas where all precipitation is collected and directed toward a single stream or set of streams.2
• Network Connectivity: These systems often involve rivers that are temporarily impounded by permanent freshwater lakes, maintaining a continuous path toward the coast.1
• Geologic Adjustment: The specific paths taken by these rivers are often determined by drainage patterns that adjust to the underlying geologic structure, such as faults, joints, or rock strength, ensuring the water effectively navigates the landscape to reach the ocean.3

Ultimately, the discharge of these rivers delivers water back to the oceans, balancing the moisture that was originally evaporated from the sea.41