Hydrographs

Why do large drainage basins have a higher peak discharge compared to smaller basins?

• Large basins have steeper slopes
• Large basins have more precipitation
• Large basins have more circular shape
• Large basins have longer lag times

What is the relationship between drainage density and lag time?

• Basins with high drainage density have longer lag times
• Basins with high drainage density have shorter lag times
• Drainage density has no impact on lag time
• Basins with high drainage density have unpredictable lag times

What is the purpose of flood hydrographs?

• To analyze population density
• To measure wind speed
• To predict flooding
• To study temperature variations

What is the impact of impermeable rock on surface runoff, throughflow, and infiltration?

• Impermeable rock increases surface runoff and increases throughflow and infiltration
• Impermeable rock increases surface runoff and reduces throughflow and infiltration
• Impermeable rock has no impact on surface runoff, throughflow, and infiltration
• Impermeable rock decreases surface runoff and increases throughflow and infiltration

Why do smaller basins generally have shorter lag times?

• Smaller basins have steeper slopes
• Smaller basins have more precipitation
• Smaller basins have shorter distances to travel
• Smaller basins have longer distances to travel

What is the relationship between permeable rock and lag time?

• Permeable rock increases peak discharge
• Permeable rock decreases lag time
• Permeable rock increases lag time
• Permeable rock has no effect on lag time

What is river discharge?

• The amount of rainfall in an area
• The shape of a river basin
• The delay between rainfall and peak discharge
• The volume of water passing a point each second

How does the shape of the drainage basin affect runoff and discharge?

• Circular basins have longer distances to travel
• Circular basins have longer lag times
• Circular basins have lower peak discharge
• Circular basins have shorter lag times and higher peak discharge

What physical factors affect the shape of a storm hydrograph?

• Shape of the drainage basin
• Size of the drainage basin
• Slope of the drainage basin
• All of the above

What is the lag time in a hydrograph?

• The delay between the maximum rainfall amount and the peak discharge
• The volume of water passing a point each second
• The amount of rainfall in an area
• The water that reaches the channel through slow throughflow and permeable rock below the water table