Hydrographs and Rainfall Analysis

The video tutorial introduces two important hydrology concepts: hydrographs and mass curves. It explains that a hydrograph is a graph showing the relationship between rainfall intensity and time, while a mass curve represents the cumulative depth of rainfall over time. The tutorial provides step-by-step instructions on how to plot both graphs using given rainfall data, emphasizing the calculation of cumulative rainfall depth and the interpretation of these graphs in hydrological studies.

What is the primary purpose of a hydrograph?

• To determine the depth of a river

• To graph the relationship between rainfall intensity and time

• To calculate the speed of wind

• To measure temperature changes over time

Which formula is used to calculate rainfall intensity?

• I = P / T

• I = T - P

• I = T / P

• I = P * T

What does a recording type of rain gauge measure?

• Temperature

• Humidity

• Wind speed

• Rainfall intensity

In a hydrograph, what does a gap in the intensity values indicate?

• No rainfall

• Decreased temperature

• Increased rainfall

• High wind speed

How is the cumulative depth of rainfall determined from a hydrograph?

• By counting the number of bars

• By calculating the area under the graph

• By measuring the height of the graph

• By adding the time intervals

What is a mass curve?

• A graph showing temperature over time

• A graph between cumulative depth of rainfall and time

• A graph of wind speed variations

• A graph of humidity levels

What unit is used for the cumulative depth of rainfall in a mass curve?

• Centimeters

• Inches

• Meters

• Liters

How is the cumulative depth calculated in a mass curve?

• By dividing total rainfall by time

• By multiplying intensity by time

• By adding individual precipitation depths

• By subtracting initial depth from final depth

What does a straight line in a mass curve indicate?

• Constant rainfall

• No rainfall

• Increasing rainfall

• Decreasing rainfall

What is indicated by the term 'storm duration' in a mass curve?

• The period of no rainfall

• The time between two storms

• The time taken for water to evaporate

• The duration of a single rainfall event