What is the term for water that flows over the ground surface after precipitation?

What is the term for water that flows over the ground surface after precipitation?

• A. Runoff
• B. River system
• C. Wetlands
• D. Ponds and lakes

Answer: (A)

Overland flow after precipitation is runoff. When rainfall is heavy or the soil can’t absorb water quickly enough—due to dry conditions, a saturated ground, or surfaces that don’t allow infiltration like pavement—the extra water runs across the surface. This water moves downslope, can form tiny channels, and eventually feeds streams and rivers. That overland flow is what hydrologists call runoff, and it’s a key part of how water travels through a watershed. This idea is different from a river system, which is the network of streams and rivers; wetlands, which are areas where the land is saturated and may hold standing water; and ponds and lakes, which are bodies of still water rather than flowing over the land.

Overland flow after precipitation is runoff. When rainfall is heavy or the soil can’t absorb water quickly enough—due to dry conditions, a saturated ground, or surfaces that don’t allow infiltration like pavement—the extra water runs across the surface. This water moves downslope, can form tiny channels, and eventually feeds streams and rivers. That overland flow is what hydrologists call runoff, and it’s a key part of how water travels through a watershed.

This idea is different from a river system, which is the network of streams and rivers; wetlands, which are areas where the land is saturated and may hold standing water; and ponds and lakes, which are bodies of still water rather than flowing over the land.