Factors Affecting Rainfall Intensity

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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?

Around midday Signup and view all the answers

What information can be obtained from a hyetograph?

All of the above Signup and view all the answers

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

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

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

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

What is a hyetograph?

A graphical representation of rainfall intensity over time Signup and view all the answers

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

Distribution Signup and view all the answers

What is the purpose of the Thiessen Polygon Method?

To determine the representative area for each rain gauge Signup and view all the answers

Which statement about the Thiessen Polygon Method is correct?

It involves bisecting the edges of triangles formed by joining the rain gauge stations Signup and view all the answers

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

Topography Signup and view all the answers

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

The availability of condensation nuclei Signup and view all the answers

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

To identify areas of high and low precipitation 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?

The isohyetal method Signup and view all the answers

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

9.58 mm Signup and view all the answers

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

To measure the areas enclosed between isohyets Signup and view all the answers

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

The catchment area Signup and view all the answers

Factors Affecting Rainfall Intensity

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