P1A 03 Factors affecting hydrographs

The two hydrographs show an urban and forest area. Which one shows an urban area?

• A
• B

The two hydrographs show a large and a small catchment area. Which one shows the small catchment area?

• A
• B

The hydrographs show a catchment area surrounded by steep slopes and a catchment area surrounded by gentle slopes.  Identify the gentle slope area.

• A
• B

The graphs show two catchment areas. One has a permeable surface and the other has an impermeable surface. Which one shows the impermeable surface?

• A
• B

Which of the following factors will cause a higher peak discharge if all other conditions are the same for both?

• A circular catchment area
• An elongated catchment area

Which of the following factors will cause a higher peak discharge if all other conditions are the same for both?

• A high density drainage basin
• A low density drainage basin

True or False? An intense thunderstorm will affect peak discharge but not lag time.

• True
• False

True or False? Flooding can be reduced by planting more trees in a catchment area.

• True
• False

True or False? Overgrazing will not decrease lag time in a catchment area.

• True
• False

True or False? Anything that will increase surface runoff and reduce infiltration and evapotranspiration will cause more flooding by streams.

• True
• False