Final answer:
The discharge of most streams in periglacial regions depends on factors like precipitation patterns and vegetation. River discharge increases after a heavy rainstorm due to surface runoff, but the normal flow is primarily from groundwater. Groundwater also contributes dissolved minerals in river water.
Step-by-step explanation:
The discharge of most streams in periglacial regions depends on various factors such as precipitation patterns, vegetation, topography, land use, and soil characteristics. After a heavy rainstorm, river discharge increases due to surface runoff.
However, the steady normal flow of river water is mainly from groundwater that discharges into the river. Groundwater also contributes a large amount of dissolved minerals in river water. River discharge is important as it is a water resource for irrigation and drinking water for many cities.