Question
Download Solution PDFSelect the option that is appropriate regarding the following two statements labelled Assertion and Reason.
Assertion: In urban areas, roofing on built-up areas, concrete and asphalts surfaces are major factors that inhibit infiltration and surface retention.
Reason: The presence of pervious surface areas decreases infiltration and initial losses and leads to consequent increase in the effective rainfall.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Infiltration is the flow of water into the ground through the soil surface.
- Roofs, concrete, and asphalt surfaces are impervious, meaning they prevent water from infiltrating.
- This reduces the amount of water that can be stored underground and replenishes groundwater supplies.
- It also increases surface runoff, which can lead to flooding problems. Hence, the assertion is correct.
- Pervious surfaces, like soil and grass, allow water to infiltrate.
- This reduces initial losses (water that evaporates or runs off before it can soak in) and increases the amount of water that can contribute to effective rainfall (the water that actually infiltrates and replenishes groundwater or contributes to plant growth).
- Thus, the reason provided is false because it incorrectly attributes the reduction of initial losses and the contribution to effective rainfall to pervious surfaces, while these are indeed correct attributes of pervious surfaces.
Last updated on May 28, 2025
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