Factors Affecting Rainfall Intensity

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Questions and Answers

What is the primary role of condensation nuclei in the formation of clouds?

  • Condensation nuclei cause the water vapor in the atmosphere to evaporate
  • Condensation nuclei have no impact on cloud formation
  • Condensation nuclei act as centers for water vapor to accumulate and form water droplets (correct)
  • Condensation nuclei prevent the formation of clouds by inhibiting water vapor condensation

How does the abundance of condensation nuclei affect rainfall?

  • Abundant condensation nuclei lead to low rainfall
  • Abundant condensation nuclei lead to heavy rains (correct)
  • Abundant condensation nuclei cause rainfall to occur only at night
  • Abundant condensation nuclei have no impact on rainfall

What is the relationship between the duration of a rainfall event and its intensity?

  • Rainfall intensity is higher for shorter durations and lower for longer durations (correct)
  • Rainfall intensity is not related to the duration of the event
  • Rainfall intensity is higher for longer durations and lower for shorter durations
  • Rainfall intensity is constant regardless of the duration

What is the typical time of day when heavy rainfalls occur?

<p>Around midday (A)</p> Signup and view all the answers

What information can be obtained from a hyetograph?

<p>All of the above (D)</p> Signup and view all the answers

What is the formula for calculating rainfall intensity (p) in mm/hr?

<p>p = 254a / (t+b) (A)</p> Signup and view all the answers

What is the formula for calculating the average rainfall depth using the Arithmetic Mean Method?

<p>Average rainfall = (Sum of rainfall depths at all gauges) / (Number of gauges) (D)</p> Signup and view all the answers

What is a hyetograph?

<p>A graphical representation of rainfall intensity over time (B)</p> Signup and view all the answers

Which characteristic of rainfall is not directly mentioned in the text?

<p>Distribution (A)</p> Signup and view all the answers

What is the purpose of the Thiessen Polygon Method?

<p>To determine the representative area for each rain gauge (C)</p> Signup and view all the answers

Which statement about the Thiessen Polygon Method is correct?

<p>It involves bisecting the edges of triangles formed by joining the rain gauge stations (D)</p> Signup and view all the answers

Which of the following factors is not mentioned in the text as influencing rainfall characteristics?

<p>Topography (B)</p> Signup and view all the answers

What is the primary factor that determines the intensity of rainfall in a given area?

<p>The availability of condensation nuclei (B)</p> Signup and view all the answers

What is the purpose of plotting isohyets on a catchment map?

<p>To identify areas of high and low precipitation (A)</p> Signup and view all the answers

Which of the following is considered one of the most accurate methods for calculating average rainfall over a catchment area?

<p>The isohyetal method (B)</p> Signup and view all the answers

In the given example, what is the average precipitation calculated using the isohyetal method?

<p>9.58 mm (C)</p> Signup and view all the answers

What is the purpose of using a planimeter in the isohyetal method?

<p>To measure the areas enclosed between isohyets (C)</p> Signup and view all the answers

Which of the following factors is least likely to impact the intensity of rainfall in a given area?

<p>The catchment area (C)</p> Signup and view all the answers

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