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Q: Select 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.
  • A. Both Assertion and Reason are false.
  • B. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
  • C. Assertion is true, but Reason is false.
  • D. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Correct Answer: Option C - Infiltration is the movement of water through the soil surface and into the soil. • The infiltration rate is the rate at which water actually enters the soil during a storm, and is equal to the infiltration capacity or the rainfall rate, whichever is less. • In urban area, roofing on built-up areas, concrete and asphalts surfaces are major factors that inhibit infiltration and surface retention. • The presence of pervious surface areas increase infiltration and initial losses and leads to consequent decrease in the effective rainfall.
C. Infiltration is the movement of water through the soil surface and into the soil. • The infiltration rate is the rate at which water actually enters the soil during a storm, and is equal to the infiltration capacity or the rainfall rate, whichever is less. • In urban area, roofing on built-up areas, concrete and asphalts surfaces are major factors that inhibit infiltration and surface retention. • The presence of pervious surface areas increase infiltration and initial losses and leads to consequent decrease in the effective rainfall.

Explanations:

Infiltration is the movement of water through the soil surface and into the soil. • The infiltration rate is the rate at which water actually enters the soil during a storm, and is equal to the infiltration capacity or the rainfall rate, whichever is less. • In urban area, roofing on built-up areas, concrete and asphalts surfaces are major factors that inhibit infiltration and surface retention. • The presence of pervious surface areas increase infiltration and initial losses and leads to consequent decrease in the effective rainfall.