FA 3 (part 2) Flashcards
(25 cards)
The recession limb is largely independent of antecedent moisture conditions.
TRUE OR FALSE
FALSE
The recession coefficient is the same for all river basins.
TRUE OR FALSE
FALSE
The recession limb equation follows an exponential decay function.
TRUE OR FALSE
TRUE
Saturation of soil before a storm event results in greater surface runoff.
TRUE OR FALSE
TRUE
If K (recession constant) is small, what does it indicate?
A. Rapid depletion of stored water
B. Long duration of base flow
C. High peak discharge
B. Long duration of base flow
The storage properties of a watershed have a major effect on the slope of the recession limb.
TRUE OR FALSE
TRUE
What is the effect of compacted soil on flood hydrographs?
A. Increases infiltration
B. Increases peak discharge
C. Decreases surface runoff
B. Increases peak discharge
Why do reservoirs help control flood hydrographs?
A. They increase surface runoff
B. They delay and reduce peak discharge
C. They increase peak discharge
B. They delay and reduce peak discharge
A watershed with a large number of lakes and ponds will have a shorter lag time.
TRUE OR FALSE
FALSE
The logarithmic transformation of the recession limb can be used for linear regression analysis.
TRUE OR FALSE
TRUE
Deforestation increases the peak discharge of a hydrograph.
TRUE OR FALSE
TRUE
The base flow contribution in a river during the recession limb is due to:
A. Overland flow
B. Stormwater runoff
C. Groundwater discharge
C. Groundwater discharge
If groundwater recharge is slow, the recession limb will:
A. Have a short duration
B. Be steeper than usual
C. Extend over a longer period
C. Extend over a longer period
Which factor would increase time to peak in a flood hydrograph?
A. High-intensity rainfall
B. Impermeable surfaces
C. Large basin size
C. Large basin size
The dominant process controlling the recession limb in a humid climate is base flow contribution.
TRUE OR FALSE
TRUE
The primary reason why steep slopes contribute to a sharp hydrograph peak is:
A. Increased infiltration
B. Increased runoff velocity
C. Reduced surface flow
B. Increased runoff velocity
What is the main controlling factor in base flow depletion?
A. Soil porosity
B. Rainfall intensity
C. Stormwater drainage
A. Soil porosity
What does a steep recession limb indicate in a flood hydrograph?
A. Prolonged baseflow
B. Quick runoff depletion
C. High infiltration rate
B. Quick runoff depletion
The final phase of the recession limb is primarily influenced by groundwater discharge.
TRUE OR FALSE
TRUE
The recession limb is also called the falling limb of the hydrograph.
TRUE OR FALSE
TRUE
The presence of extensive drainage networks in a basin will result in:
A. Decreased surface runoff
B. Increased infiltration
C. Faster runoff response and higher flood peaks
C. Faster runoff response and higher flood peaks
Larger river basins generally exhibit a slower response to rainfall than smaller basins.
TRUE OR FALSE
TRUE
The initial decline of the recession limb is dominated by interflow and subsurface flow.
TRUE OR FALSE
TRUE
Reservoirs and lakes help in reducing flood peaks in downstream areas.
TRUE OR FALSE
TRUE
