18 Questions
What is the primary role of condensation nuclei in the formation of clouds?
Condensation nuclei act as centers for water vapor to accumulate and form water droplets
How does the abundance of condensation nuclei affect rainfall?
Abundant condensation nuclei lead to heavy rains
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
What is the typical time of day when heavy rainfalls occur?
Around midday
What information can be obtained from a hyetograph?
All of the above
What is the formula for calculating rainfall intensity (p) in mm/hr?
p = 254a / (t+b)
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)
What is a hyetograph?
A graphical representation of rainfall intensity over time
Which characteristic of rainfall is not directly mentioned in the text?
Distribution
What is the purpose of the Thiessen Polygon Method?
To determine the representative area for each rain gauge
Which statement about the Thiessen Polygon Method is correct?
It involves bisecting the edges of triangles formed by joining the rain gauge stations
Which of the following factors is not mentioned in the text as influencing rainfall characteristics?
Topography
What is the primary factor that determines the intensity of rainfall in a given area?
The availability of condensation nuclei
What is the purpose of plotting isohyets on a catchment map?
To identify areas of high and low precipitation
Which of the following is considered one of the most accurate methods for calculating average rainfall over a catchment area?
The isohyetal method
In the given example, what is the average precipitation calculated using the isohyetal method?
9.58 mm
What is the purpose of using a planimeter in the isohyetal method?
To measure the areas enclosed between isohyets
Which of the following factors is least likely to impact the intensity of rainfall in a given area?
The catchment area
Explore the factors that influence the intensity of rainfall, such as the availability of condensation nuclei and the time of day. Learn how the presence of minute particles like dust and ash, as well as convectional uplift due to heating, can impact the amount of rainfall in a particular area.
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