A
Water table
FIGURĘ 11.4 (A) In this natural system, the stream drains water from the region—not only surface runoff, but ground water from adjacent satu-rated rocks and soil that slowly drains into the stream. Such slow ground-water influx explains why many streams can keep flowing even when there has been no rain for weeks. The stream represents a site of groundwater discharge. (B) Here. water from the stream channel percolates downward to add to the groundwater supply.