The surface Run-off is the quantity of watera)absorbed by soilb)interc...
Runoff is the amount of water that doesn't get infiltrated into the soil, thus it is the amount from the total precipitation which moves into the stream
The surface Run-off is the quantity of watera)absorbed by soilb)interc...
Understanding Surface Run-off
Surface run-off refers to the flow of excess water that does not infiltrate into the soil or evaporate but instead moves over the land surface towards water bodies. It is a critical concept in hydrology and civil engineering, influencing various aspects of water management.
Key Characteristics of Surface Run-off:
- Water Movement: Surface run-off primarily consists of water that has fallen as precipitation and cannot be absorbed by the ground due to saturation or impervious surfaces.
- Contribution to Water Bodies: The run-off eventually reaches streams, rivers, lakes, or oceans, thus playing a crucial role in the hydrological cycle.
- Impact of Urbanization: In urban areas, impervious surfaces like roads and buildings increase surface run-off because they prevent water from soaking into the ground, leading to higher volumes reaching drainage systems.
Why Option D is Correct:
- Definition of Surface Run-off: The correct definition of surface run-off is precisely the water that reaches stream channels, making option 'D' the accurate choice.
- Distinction from Other Options:
- Option A (absorbed by soil): Refers to infiltration, not run-off.
- Option B (intercepted by buildings and vegetation): This describes water temporarily held up, not the run-off itself.
- Option C (required to fill surface depressions): This is water that may contribute to run-off after pooling, but it does not define run-off.
- Option E (that gets evaporated): This pertains to evaporation, which is a different process altogether.
Conclusion:
Understanding surface run-off is essential for effective water resource management, flood control, and environmental sustainability in civil engineering projects. Recognizing that it is the water reaching the stream channels clarifies its role in the hydrological cycle and informs effective planning and infrastructure development.
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