FA 3 (part 1)

Question 1

A large drainage basin will have a longer time to peak than a small drainage basin.

TRUE OR FALSE

Answer 1

TRUE

Question 2

Flat terrain promotes infiltration and results in a hydrograph with a lower peak and longer duration.

TRUE OR FALSE

Answer 2

TRUE

Question 3

The presence of karst topography in a watershed will generally result in a sharper hydrograph peak.

TRUE OR FALSE

Answer 3

FALSE

Question 4

High wind speed has a significant impact on the shape of a flood hydrograph.

TRUE OR FALSE

Answer 4

FALSE

Question 5

If a basin has a steep slope, the recession limb will be:

A. Steeper

B. Flatter

C. Irregular

Answer 5

A. Steeper

Question 6

A river with a low gradient will have a longer lag time compared to a river with a steep gradient

TRUE OR FALSE

Answer 6

TRUE

Question 7

The recession limb is independent of the initial soil moisture conditions.

TRUE OR FALSE

Answer 7

FALSE

Question 8

The parameter K in the recession equation represents:

A. Runoff coefficient

B. Time of concentration

C. Recession constant

Answer 8

C. Recession constant

Question 9

A flat recession curve is common in watersheds with significant storage capacity.

TRUE OR FALSE

Answer 9

TRUE

Question 10

The recession limb of a hydrograph primarily represents:

A. The increase in river discharge after peak flow

B. The depletion of stored water after peak flow

C. The initial rise in water level due to rainfall

Answer 10

B. The depletion of stored water after peak flow

Question 11

The recession limb is generally longer than the rising limb.

TRUE OR FALSE

Answer 11

TRUE

Question 12

The time of concentration of a watershed is inversely proportional to the watershed’s slope.

TRUE OR FALSE

Answer 12

TRUE

Question 13

Forested watersheds exhibit lower peak discharges and longer recession limbs compared to deforested watersheds.

TRUE OR FALSE

Answer 13

TRUE

Question 14

A large contributing drainage area will typically result in a lower peak discharge.

TRUE OR FALSE

Answer 14

FALSE

Question 15

A watershed with a dense vegetation cover will produce hydrographs with steeper rising limbs

TRUE OR FALSE

Answer 15

FALSE

Question 16

The recession constant (K) is influenced by:

A. Basin geology and storage characteristics

B. Only precipitation intensity

C. Temperature changes alone

Answer 16

A. Basin geology and storage characteristics

Question 17

Which type of storm duration is likely to cause a flood hydrograph with a prolonged peak?

A. Short, intense storm

B. Long-duration, moderate rainfall

C. Short drizzle

Answer 17

B. Long-duration, moderate rainfall

Question 18

What effect does the size of a drainage basin have on a flood hydrograph?

A. Larger basins have a shorter lag time

B. Smaller basins generate lower peak discharge

C. Larger basins tend to have a delayed peak discharge

Answer 18

C. Larger basins tend to have a delayed peak discharge

Question 19

The presence of vegetation in a watershed reduces surface runoff and lowers peak discharge.

TRUE OR FALSE

Answer 19

TRUE

Question 20

In a highly permeable basin, the recession limb is generally:

A. Steeper

B. Gentler

C. Unaffected

Answer 20

B. Gentler

Question 21

A very short recession limb indicates high water retention in the basin.

TRUE OR FALSE

Answer 21

FALSE

Question 22

A watershed with extensive agricultural land will have a steeper rising limb in a hydrograph.

TRUE OR FALSE

Answer 22

FALSE

Question 23

The unit hydrograph concept is used in predicting runoff from a given rainfall event.

TRUE OR FALSE

Answer 23

TRUE

Question 24

The shape of a watershed has no significant impact on the peak discharge of a flood hydrograph.

TRUE OR FALSE

Answer 24

FALSE

Question 25

The Manning’s equation is frequently used to analyze the recession limb. TRUE OR FALSE

Answer 25

FALSE