The run off increases with_______.

This question was previously asked in
UKPSC JE Civil 8 May 2022 Official Paper-II
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  1. increase in intensity of rain
  2. increase in filtration capacity
  3. ncrease in permeability of soil
  4. None of the above

Answer (Detailed Solution Below)

Option 1 : increase in intensity of rain
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The factors affecting the runoff can be summarised in below tabulated form

Parameter

Description

Intensity of Rainfall

Higher the intensity of rainfall more will be the volume of water on ground and more will be runoff.

Infiltration Capacity

Higher the infiltration capacity of soil means more water is getting into inside the soil and less water available for runoff, hence reduces runoff.

Permeability of soil

Higher the permeability of soil means more water is getting into inside the soil and meeting to ground water and less water available for runoff, hence reduces runoff.

Urbanization

Urbanization reduces the infiltration capacity and hence, increases the runoff

Rainfall amount, Rainfall duration

Rainfall lasting for longer period creates more runoff.

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