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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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What do we call the process of excess water making its way back into ponds or streams?
Precipitation
Transpiration
Runoff
Condensation
Runoff
Runoff is the movement of water from precipitation, snowmelt, or other sources across the Earth's surface. It occurs when the rate of water supply to the surface exceeds the infiltration capacity of the soil, causing water to flow into channels like streams, rivers, and ponds.
Runoff is the movement of water from precipitation, snowmelt, or other sources across the Earth's surface. It occurs when the rate of water supply to the surface exceeds the infiltration capacity of the soil, causing water to flow into channels like streams, rivers, and ponds.
R=P−L — where R is runoff, P is precipitation, and L represents losses (infiltration, evaporation, storage).
The process is driven by gravity. Once the soil becomes saturated or the rainfall intensity surpasses the infiltration capacity (f<i), the excess water forms overland flow (surface runoff). This flow follows the topographic gradient until it reaches low-lying basins or drainage networks.
Runoff is a critical component of the water budget in hydrology.
It is categorized into surface runoff, interflow, and baseflow.
Surface runoff is highly dependent on land cover, slope, and soil type.
Replenishes surface water bodies.
Essential for sustaining aquatic ecosystems.
Can lead to severe soil erosion.
Causes flash flooding in urban areas.
Flood forecasting and disaster management.
Water resources planning and dam design.
Option A (Precipitation) is the atmospheric moisture falling to earth.
Option B (Transpiration) is the release of water vapor from plants.
Option D (Condensation) is the phase change from vapor to liquid.
C is correct — Runoff is the term specifically used to describe the flow of excess water across the land surface into surface water bodies.
Always remember the difference between surface runoff and baseflow; baseflow is the delayed contribution of groundwater to streams, whereas runoff is primarily surface-driven.