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HYDRO REMOVAL

Total questions: 60

Worksheet time: 30mins

Name
Class
Date
1.

How does soil texture influence infiltration capacity?

a)

Soil texture has no impact on infiltration

b)

Fine-textured soils allow faster infiltration

c)

Coarse-textured soils have higher infiltration rates than fine-textured soils

d)

Coarse-textured soils have lower infiltration rates than fine-textured soils

2.

True or False: Rainwater infiltration rates in agricultural fields are typically higher than in undisturbed forest land.

a)

True

b)

False

3.

How does soil particle size distribution affect infiltration?

a)

Coarse particles allow higher infiltration than fine particles

b)

Fine particles allow higher infiltration than coarse particles

c)

Particle size does not affect infiltration

d)

Smaller particles increase infiltration

4.

Vegetation on the soil surface affects infiltration by:

a)

Reducing infiltration

b)

Preventing infiltration

c)

Having no effect on infiltration

d)

Increasing infiltration by slowing runoff and allowing absorption

5.

True or False: Water with higher salinity reduces infiltration rates due to soil dispersion effects.

a)

True

b)

False

6.

How does temperature affect infiltration?

a)

Higher temperatures increase infiltration by lowering water viscosity

b)

Temperature has no effect on infiltration

c)

Lower temperatures increase infiltration

d)

Higher temperatures reduce infiltration

7.

True or False: Horton’s infiltration equation assumes a linear decrease in infiltration over time.

a)

True

b)

False

8.

Which of the following fluid properties influences infiltration the most?

a)

Color

b)

Viscosity

c)

Salinity

d)

Density

9.

Which type of soil has the highest water-holding capacity?

a)

Clayey soil

b)

Sandy soil

c)

Silty soil

d)

Loamy soil

10.

Which land surface condition favors higher infiltration?

a)

Smooth and impervious surface

b)

Sealed and compacted soil

c)

Well-vegetated surface

d)

Waterlogged fields

11.

In Horton’s infiltration model, the infiltration rate decreases with time. What is this decrease attributed to?

a)

Soil compaction

b)

Increase in rainfall intensity

c)

Decrease in soil permeability

d)

Decrease in surface water availability

12.

True or False: In Philip’s model, the relationship between the initial infiltration rate and time is characterized by a power-law function.

a)

True

b)

False

13.

What is the main difference between Horton’s and Philip’s infiltration equations?

a)

Philip’s equation includes a constant rate of infiltration

b)

Horton’s equation assumes a constant infiltration rate over time

c)

Philip’s equation accounts for both rapid and slow infiltration phases

d)

Horton’s equation is more complex than Philip’s

14.

In Philip’s infiltration model, the infiltration rate decreases over time due to:

a)

Decreasing soil moisture content

b)

Decreasing rainfall intensity

c)

Decreasing soil permeability

d)

Increasing vegetation cover

15.

In Kostyakov’s equation, the infiltration rate decreases primarily due to:

a)

Soil compaction

b)

High rainfall intensity

c)

Evaporation from the soil surface

d)

Decreased pore space as the soil becomes saturated

16.

In Kostyakov’s infiltration model, the infiltration rate is proportional to:

a)

Rainfall intensity

b)

Vegetation cover

c)

Atmospheric pressure

d)

Soil moisture content and time

17.

True or False: Kostyakov’s model is more effective than Horton’s model for predicting infiltration during heavy rainfall events.

a)

True

b)

False

18.

In Horton’s infiltration model, what happens to the infiltration rate as time increases?

a)

It decreases exponentially

b)

It increases exponentially

c)

It fluctuates randomly

d)

It remains constant

19.

True or False: The final steady infiltration rate in Horton’s model is determined by the soil’s maximum water-holding capacity.

a)

True

b)

False

20.

In Kostyakov’s model, the infiltration rate decreases primarily because:

a)

The soil becomes compacted over time

b)

The soil pores become clogged with water

c)

The soil’s ability to absorb water is limited by moisture content

d)

The infiltration rate is proportional to rainfall intensity

21.

Which of the following methods is based on a simple float traveling along the surface of the water to measure discharge?

a)

Float method

b)

Rating curve method

c)

Velocity-area method

d)

Pressure transducer method

22.

True or False: The float method can be adapted for use in rivers with strong eddies and turbulence if the float is heavy enough to maintain a consistent velocity.

a)

True

b)

False

23.

What type of pressure sensor is commonly used in discharge measurement systems?

a)

Strain gauge pressure transducer

b)

Capacitive pressure sensor

c)

Mercury-based sensor

d)

Magnetic field sensor

24.

What is the main benefit of using the velocity-area method for discharge measurement in large rivers?

a)

It is the simplest method

b)

It does not require calibration

c)

It is suitable for low-flow conditions only

d)

It accounts for varying flow velocity across the cross-section

25.

True or False: Velocity-area method works best for steady-flow rivers and is less accurate for highly turbulent rivers.

a)

True

b)

False

26.

Which type of discharge measurement method is considered the most cost-effective for small streams?

a)

Pressure transducer

b)

Velocity-area method

c)

Float method

d)

Weir method

27.

True or False: Pressure transducers measure the flow velocity, which is necessary for discharge calculation.

a)

True

b)

False

28.

The discharge measurement system that combines stage data with cross-sectional flow measurements is called:

a)

Rating curve system

b)

Velocity-area system

c)

Float method system

d)

Pressure transducer system

29.

What is one of the main limitations of using a weir for discharge measurement?

a)

It is expensive to install

b)

It can only be used in large rivers

c)

It requires consistent maintenance

d)

It does not provide accurate data during floods

30.

Which type of gauge would be least affected by water surface fluctuations caused by waves or turbulence?

a)

Float gauge

b)

Weir gauge

c)

Pressure transducer

d)

Velocity-area method

31.

For a catchment with a large area, runoff will generally:

a)

Be less

b)

Be more

c)

Not change

d)

Be the same for all catchments

32.

True or False: Infiltration rates are rapid as a result of physical attraction of soil particles, which is most commonly referred to as sublimation.

a)

True

b)

False

33.

In an urbanized area with more impervious surfaces, you would expect:

a)

Increased runoff

b)

Decreased runoff

c)

Increased infiltration

d)

Decreased rainfall intensity

34.

True or False: The time of concentration for a catchment increases with greater rainfall intensity.

a)

True

b)

False

35.

The “time of concentration” in runoff calculation refers to:

a)

The time for water to infiltrate into the soil

b)

The time it takes for water to travel from the catchment’s farthest point to the outlet

c)

The time for a rainfall event to end

d)

The time water takes to evaporate

36.

True or False: The time of concentration increases significantly in rural catchments with dense vegetation compared to those with sparse vegetation.

a)

True

b)

False

37.

The main advantage of the Rational Method is that it:

a)

Requires detailed rainfall data

b)

Is suitable for large catchments

c)

Accounts for groundwater recharge

d)

Is simple and quick to apply for small urban catchments

38.

What is the effect of a steep catchment slope on the time of concentration?

a)

The time of concentration increases

b)

The time of concentration decreases

c)

There is no effect on time of concentration

d)

It reduces the runoff volume

39.

True or False: Infiltration capacity is typically higher for clayey soils compared to sandy soils.

a)

True

b)

False

40.

The Rational Method can be used to calculate:

a)

The runoff from a small, urbanized catchment

b)

The total rainfall in a catchment

c)

The infiltration rate of a soil

d)

The groundwater recharge

41.

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

a)

Larger basins have a shorter lag time

b)

Basin size has no effect on hydrographs

c)

Smaller basins generate lower peak discharge

d)

Larger basins tend to have a delayed peak discharge

42.

True or False: Artificial storage ponds help in delaying peak discharge in flood hydrographs.

a)

True

b)

False

43.

Which of the following best describes the falling limb of a flood hydrograph?

a)

Period when runoff contribution is reducing

b)

Period when river discharge is increasing

c)

Period of base flow before rainfall

d)

Peak of the flood event

44.

What does an extremely steep rising limb in a flood hydrograph indicate?

a)

High infiltration

b)

Slow overland flow

c)

Low rainfall intensity

d)

Rapid surface runoff

45.

How does the shape of a drainage basin influence the hydrograph?

a)

Circular basins delay peak flow

b)

Circular basins produce sharper peaks

c)

Basin shape has no effect on flood hydrographs

d)

Elongated basins generate higher peak discharge

46.

How does basin slope affect the flood hydrograph?

a)

Flatter slopes cause higher peak discharge

b)

Steeper slopes lead to shorter lag time

c)

Flatter slopes reduce surface runoff

d)

Steeper slopes increase infiltration

47.

How does channel roughness affect a flood hydrograph?

a)

Rough channels increase peak discharge

b)

Rough channels reduce flow velocity

c)

Smooth channels increase lag time

d)

Smooth channels slow down flow

48.

True or False: A watershed with a high drainage density produces a lower peak discharge.

a)

True

b)

False

49.

Which feature of a drainage basin leads to a faster flood response?

a)

High infiltration capacity

b)

Vegetation cover

c)

Large basin size

d)

Steep slopes

50.

True or False: A watershed with a dense vegetation cover will produce hydrographs with steeper rising limbs.

a)

True

b)

False

51.

Which component is dominant in the final stage of the recession limb?

a)

Base flow from groundwater

b)

Direct surface runoff

c)

Rainfall excess

d)

Interflow

52.

. True or False: The base flow recession curve can be extended indefinitely.

a)

True

b)

False

53.

The recession limb is primarily influenced by which type of storage?

a)

Channel storage and groundwater storage

b)

Atmospheric moisture storage

c)

Overland flow storage

d)

Rainfall storage

54.

A recession limb with an exponential decay pattern indicates:

a)

Uniform base flow contribution

b)

A stable groundwater system

c)

Rapid decrease in peak flow

d)

Constant streamflow

55.

True or False: Watersheds with dense vegetation tend to have longer and more gradual recession limbs.

a)
True
b)
False
56.

True or False: Flood routing models often include recession limb analysis to predict downstream flows.

a)
True
b)
False
57.

Which factor increases the length of the recession limb?

a)

Steep slopes

b)

Low infiltration rates

c)

Impermeable surfaces

d)

High groundwater recharge

58.

In an urbanized watershed, the recession limb is usually:

a)

Steeper

b)

More erratic

c)

Unaffected

d)

More gradual

59.

Which of the following factors shortens the recession limb?

a)

Impermeable land surfaces

b)

High groundwater storage

c)

Vegetation cover

d)

Gentle slopes

60.

True or False: A more permeable aquifer leads to a faster recession of base flow.

a)
True
b)
False