Understanding Rainfall Hyetographs

Dr. Doyle introduces the concept of a rainfall hyetograph, a graph showing rainfall intensity over time. The video explains the components of a hyetograph, including intensity, duration, and frequency, and discusses how these elements are measured and interpreted. The concept of frequency and exceedance probability is explored, along with the idea of a cumulative rainfall hyetograph. The video concludes with a preview of the next topic, IDF curves.

What does the x-axis represent in a rainfall hyetograph?

• Frequency

• Location

• Time

• Intensity of rainfall

Which of the following is NOT a component of a rainfall hyetograph?

• Frequency

• Duration

• Temperature

• Intensity

How is intensity typically measured in a rainfall hyetograph?

• Centimeters per day

• Gallons per second

• Millimeters per hour

• Liters per minute

What does the duration of a storm refer to in a hyetograph?

• The average intensity of the storm

• The total amount of rainfall

• The time between the first and last drop of rain

• The frequency of rainfall events

What statistical concept is used to describe the frequency of rainfall events?

• Standard deviation

• Mean

• Exceedance probability

• Median

What is a '100-year storm' an example of?

• Cumulative rainfall

• Return period

• Duration

• Intensity

What does a cumulative rainfall hyetograph show?

• The total rainfall at any point during the storm

• The average intensity of the storm

• The frequency of rainfall events

• The duration of the storm

How is a cumulative rainfall hyetograph normalized?

• By measuring the total rainfall in liters

• By calculating the exceedance probability

• By averaging the intensity over the duration

• By dividing time by total time and precipitation by total precipitation

What does the slope of a cumulative rainfall curve indicate?

• The total duration of the storm

• The location of the storm

• The frequency of rainfall events

• The intensity of rainfall

At what point does a cumulative rainfall hyetograph start?

• At zero

• At the end of the storm

• At the peak intensity

• At the average intensity