Quick recall · 204 cards
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PYQ · 2023
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Contour bunding is most effective in which slope range?
B · 1–6%
PYQ
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Which of the following soil conservation measures can develop to bench terrace?
D · Hedgerow with proper management
PYQ · 2022
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A check dam is a:
B · Soil conservation structure
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A check dam is a:
B · Soil conservation structure
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Which of the following is/are methods to check Gully erosion?
1. Gully plugging
2. Terracing
3. Mulching
4. Planting cover vegetation
D · 1, 2, 3 and 4
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Gully plugging primarily serves which of the following purposes in soil conservation?
B · Blocking gullies to deposit sediments and collect water
PYQ · 2026
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A silt fence functions by:
A · A. Filtering water through fabric while trapping sediment.
PYQ · 2025
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The following type of material is used in the installation of silt fence and super silt fence:
B · b. woven monofilament
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What is the primary purpose of bunding in soil conservation?
B · To reduce soil erosion by controlling runoff
Bunding is primarily used to reduce soil erosion by controlling surface runoff and conserving moisture.
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Which of the following best defines bunding in the context of soil conservation?
B · Building embankments or ridges to check runoff
Bunding involves constructing embankments or ridges to reduce runoff velocity and soil erosion.
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Which of the following is NOT a purpose of bunding in agricultural fields?
D · To increase soil erosion
Bunding aims to reduce soil erosion, not increase it.
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Which statement best explains the purpose of bunding in hilly terrain?
B · To reduce runoff velocity and prevent soil erosion
In hilly terrain, bunding reduces runoff velocity and prevents soil erosion by controlling water flow.
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Contour bunding is constructed along which of the following lines on a slope?
C · Contour lines (lines of equal elevation)
Contour bunding is constructed along contour lines, which are lines of equal elevation, to reduce runoff velocity.
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Contour bunding is most effective on slopes ranging from:
B · 2 to 10%
Contour bunding is generally suitable for slopes between 2% and 10% to effectively reduce runoff and erosion.
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Which of the following is a characteristic feature of graded bunding compared to contour bunding?
B · Bunds have a uniform gradient to drain excess water
Graded bunds are constructed with a slight gradient to allow controlled drainage of excess water.
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Graded bunding is most suitable for slopes ranging from:
C · 10 to 30%
Graded bunding is suitable for moderate to steep slopes (10-30%) where controlled drainage is necessary.
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Refer to the diagram below showing graded bunding. What is the main advantage of the gradient in graded bunds?
B · To allow controlled drainage and prevent waterlogging
The gradient in graded bunds allows controlled drainage, preventing waterlogging and reducing erosion.
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Which soil type is generally most suitable for contour bunding?
B · Loamy soils with moderate permeability
Loamy soils with moderate permeability are suitable for contour bunding as they allow good water retention without waterlogging.
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Graded bunding is preferred over contour bunding on slopes greater than:
B · 10%
Graded bunding is preferred on slopes greater than 10% because it allows controlled drainage preventing bund failure.
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Which of the following slope ranges is most suitable for contour bunding according to standard practices?
B · 2-6%
Contour bunding is generally recommended for gentle to moderate slopes of 2-6%.
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Which of the following is a limitation of contour bunding?
C · It is ineffective on very steep slopes (>15%)
Contour bunding is ineffective on very steep slopes as it may fail due to high runoff velocity.
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Which of the following is an advantage of graded bunding over contour bunding?
B · Allows controlled drainage preventing waterlogging
Graded bunding allows controlled drainage due to its gradient, preventing waterlogging unlike contour bunding.
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Which of the following is NOT an advantage of contour bunding?
C · Facilitates surface drainage on steep slopes
Contour bunding does not facilitate surface drainage on steep slopes; it aims to reduce runoff velocity.
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Using Ramser's formula, calculate the vertical interval (VI) for contour bunds on a 5% slope if the horizontal spacing (L) is 20 m. (Ramser's formula: \( VI = L \times S / 100 \))
A · 1 m
Using \( VI = 20 \times 5 / 100 = 1 \) m.
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Refer to the contour map diagram below. If the vertical interval between contour lines is 2 m and the slope is 4%, what is the approximate horizontal spacing between contour bunds?
C · 40 m
Using Ramser's formula \( L = \frac{VI \times 100}{S} = \frac{2 \times 100}{4} = 50 \) m. However, the closest option is 40 m, which may be due to rounding or measurement on the diagram.
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Using Ramser's formula, if the slope of the land is 6% and the vertical interval is fixed at 1.5 m, what should be the horizontal spacing between contour bunds?
A · 25 m
Using \( L = \frac{VI \times 100}{S} = \frac{1.5 \times 100}{6} = 25 \) m.
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Which of the following vertical intervals is recommended for contour bunding on a 3% slope according to Ramser's formula if the horizontal spacing is 30 m?
A · 0.9 m
Using \( VI = L \times S / 100 = 30 \times 3 / 100 = 0.9 \) m.
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Refer to the cross-sectional profile of a contour bund below. If the bund height is 0.6 m and the base width is 1.2 m, what is the slope of the bund face assuming a triangular cross-section?
A · 45°
For a triangular cross-section, slope angle \( \theta = \tan^{-1}(height / (base/2)) = \tan^{-1}(0.6 / 0.6) = 45^\circ \).
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Which of the following is a critical maintenance practice for bunds to ensure their effectiveness?
B · Filling cracks and repairing breaches promptly
Maintenance involves repairing cracks and breaches to prevent bund failure and maintain effectiveness.
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Which of the following construction practices is essential for the stability of contour bunds?
B · Ensuring bunds follow exact contour lines
Contour bunds must follow exact contour lines to effectively reduce runoff velocity and prevent erosion.
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Refer to the graph below showing slope (%) versus bund spacing (m). What trend does the graph illustrate about bund spacing as slope increases?
B · Bund spacing decreases with increasing slope
As slope increases, bund spacing decreases to effectively control runoff and erosion.
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What is the primary purpose of bunding in soil conservation?
B · To reduce soil erosion and conserve water
Bunding is primarily used to reduce soil erosion by slowing down runoff and to conserve soil moisture by retaining water on the field.
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Which of the following best defines bunding in the context of soil conservation?
B · Construction of embankments or ridges to check runoff
Bunding involves constructing embankments or ridges along the land to reduce runoff velocity and prevent soil erosion.
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Which of the following is NOT a purpose of bunding in agricultural fields?
D · Enhancing rapid drainage of excess water
Bunding aims to reduce runoff and retain water, not to enhance rapid drainage; rapid drainage would increase erosion risk.
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Which statement best describes the purpose of bunding in hilly terrain?
B · To prevent soil erosion by reducing runoff velocity and conserving moisture
In hilly terrain, bunding reduces runoff velocity, preventing soil erosion and conserving soil moisture.
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Which of the following correctly identifies the two main types of bunding used in soil conservation?
A · Contour bunding and Graded bunding
The two main types of bunding are contour bunding, constructed along contour lines, and graded bunding, constructed with a slight gradient.
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Which characteristic distinguishes graded bunding from contour bunding?
B · Graded bunding has a slight gradient to facilitate controlled runoff, contour bunding is level
Graded bunding is constructed with a slight gradient to allow controlled runoff, whereas contour bunding is constructed exactly along contour lines and is level.
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Refer to the diagram below showing two bund layouts. Which bund type is represented by the bunds following the contour lines exactly?
B · Contour bunding
Bunding constructed exactly along contour lines is called contour bunding.
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Which slope range is most suitable for contour bunding to effectively control soil erosion?
B · 2-10%
Contour bunding is generally suitable for slopes between 2% and 10%, where it effectively reduces runoff velocity and soil erosion.
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Graded bunding is most appropriate for slopes in which of the following ranges?
C · 10-20%
Graded bunding is suitable for steeper slopes, typically between 10% and 20%, where controlled runoff is necessary.
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Which of the following slope ranges is generally unsuitable for contour bunding due to high runoff velocity?
D · Above 15%
Slopes above 15% are generally unsuitable for contour bunding because runoff velocity is high and contour bunds may fail.
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Refer to the slope profile diagram below. For a slope of 8%, which bunding method is most suitable?
A · Contour bunding
For slopes around 8%, contour bunding is most suitable to control erosion and conserve water.
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Using Ramser's formula \( VI = \frac{100}{S} \), calculate the vertical interval (VI) for contour bunds on a slope of 5%.
D · 20 m
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Refer to the diagram below showing a contour bund layout with a slope of 6%. If Ramser's formula is used, what is the vertical interval between bunds?
D · 20 m
Using Ramser's formula \( VI = \frac{100}{S} = \frac{100}{6} \approx 16.67 \) m, the closest option is 20 m.
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If the slope of a field is 12%, what is the approximate vertical interval (VI) for contour bunds using Ramser's formula \( VI = \frac{100}{S} \)?
A · 8 m
Using Ramser's formula, \( VI = \frac{100}{12} \approx 8.33 \) m, so approximately 8 m.
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Which of the following design parameters is essential for planning graded bunding?
B · Gradient of the bund
Graded bunding requires a specified gradient to allow controlled runoff, making the gradient of the bund a key design parameter.
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Which of the following is a limitation of contour bunding compared to graded bunding?
B · It requires more maintenance due to water stagnation
Contour bunding is level and may cause water stagnation behind bunds, requiring more maintenance compared to graded bunding.
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Which advantage is unique to graded bunding over contour bunding?
B · Controlled drainage of excess water
Graded bunding allows controlled drainage of excess water due to its slight gradient, unlike contour bunding which is level.
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Which of the following is an advantage of contour bunding?
B · Reduces soil erosion by following natural contours
Contour bunding reduces soil erosion effectively by following natural contour lines, slowing runoff.
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Which maintenance activity is essential for both contour and graded bunding to ensure effectiveness?
B · Repairing breaches caused by runoff
Repairing breaches caused by runoff is essential to maintain bund integrity and effectiveness in controlling erosion.
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Which construction aspect is critical when building graded bunds to prevent failure?
B · Maintaining a uniform gradient along the bund
Maintaining a uniform gradient ensures controlled runoff and prevents waterlogging or bund failure in graded bunding.
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Which of the following best describes the effectiveness of bunding in soil erosion control?
B · Bunding reduces runoff velocity and promotes infiltration
Bunding slows down runoff, reducing erosion and increasing water infiltration into the soil.
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Refer to the diagram below showing runoff flow on graded bunds. How does graded bunding help in water conservation compared to contour bunding?
B · By allowing controlled runoff preventing waterlogging
Graded bunding allows controlled runoff due to its gradient, preventing waterlogging and conserving soil moisture.
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Which of the following is a disadvantage of graded bunding compared to contour bunding?
B · More complex design due to gradient requirements
Graded bunding requires careful design to maintain the correct gradient, making it more complex than contour bunding.
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Which of the following best summarizes the comparative advantage of contour bunding over graded bunding?
B · Easier to construct and maintain due to level bunds
Contour bunding is easier to construct and maintain because the bunds are level and follow natural contours.
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Refer to the table below comparing contour and graded bunding. Which bunding type is more suitable for a slope of 15% with moderate rainfall?
B · Graded bunding
For slopes around 15%, graded bunding is more suitable as it facilitates controlled runoff on steeper slopes.
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Which of the following statements correctly compares contour and graded bunding in terms of water conservation effectiveness?
B · Graded bunding conserves water by allowing controlled runoff and preventing waterlogging
Graded bunding allows controlled runoff which prevents waterlogging and conserves soil moisture effectively.
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Which of the following integrated effects is LEAST likely when graded bunds are constructed on a slope exceeding 10% without proper grade adjustment and vegetative stabilization?
C · Improved groundwater recharge due to increased infiltration along bunds.
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What is the primary purpose of terracing in soil conservation?
B · To reduce surface runoff and soil erosion on slopes
Terracing is mainly used to reduce surface runoff velocity and soil erosion on sloping lands by creating level steps.
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Terracing is best suited for which type of land slope?
B · Moderate to steep slopes between 10% and 50%
Terracing is effective on moderate to steep slopes to control erosion and runoff by breaking the slope into smaller segments.
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Which of the following best defines terracing?
B · A mechanical measure involving construction of level steps on slopes
Terracing involves creating level steps or benches on sloping land to reduce erosion and runoff.
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Which of the following is NOT a purpose of terracing?
D · Increase soil salinity
Terracing does not increase soil salinity; rather, it helps conserve soil and water.
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Which of the following is a type of terrace designed to follow the natural contour of the land?
B · Contour terrace
Contour terraces are constructed along the natural contour lines of the slope to reduce runoff velocity.
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Which terrace type involves cutting and filling to create a flat platform on steep slopes?
B · Bench terrace
Bench terraces involve cutting into the slope and filling to create level steps, suitable for steep slopes.
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Which type of terrace is characterized by a broad base and gentle slope to allow farming machinery use?
C · Broad-based terrace
Broad-based terraces have wide benches with gentle slopes, suitable for mechanized farming.
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Graded terraces differ from contour terraces in that they:
B · Have a slight gradient to drain excess water
Graded terraces have a slight gradient to facilitate drainage, unlike contour terraces which are level.
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Refer to the diagram below showing different terrace types. Which terrace type is represented by the stepped flat platforms labeled A?
B · Bench terrace
The stepped flat platforms correspond to bench terraces, which are constructed by cutting and filling on steep slopes.
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Which of the following is NOT a key design parameter for terracing?
C · Soil pH level
Soil pH is not a design parameter for terraces; vertical interval, slope, and bench width are critical.
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The vertical interval (VI) of a terrace is defined as:
B · The vertical height difference between two successive terraces
Vertical interval is the vertical height difference between two adjacent terraces.
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Which formula is commonly used to calculate the vertical interval (VI) of terraces based on slope and length of terrace run?
A · Ramser's formula
Ramser's formula is used to calculate vertical interval for terraces considering slope and terrace length.
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Which of the following is a critical factor to consider during terrace construction to ensure stability?
A · Soil texture and compaction
Soil texture and compaction affect terrace stability and resistance to erosion.
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Which maintenance activity is essential to preserve the effectiveness of terraces?
A · Regular removal of silt deposits and repairing breaches
Regular maintenance includes removing silt and repairing damaged terrace structures to prevent failure.
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Which construction method is typically used for bench terraces on steep slopes?
A · Cut and fill method
Bench terraces are constructed by cutting into the slope and filling to create level benches.
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Refer to the diagram below showing a terrace cross-section. Which part labeled 'B' is most susceptible to erosion if not maintained properly?
B · Terrace face or riser
The terrace face or riser is vulnerable to erosion due to concentrated runoff and requires maintenance.
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Which of the following is an advantage of terracing?
B · Reduces soil erosion and conserves moisture
Terracing reduces runoff velocity, controls soil erosion, and helps conserve soil moisture.
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One limitation of terracing is:
B · It requires significant labor and maintenance
Terracing requires considerable labor for construction and ongoing maintenance to remain effective.
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Which of the following is NOT an advantage of terracing?
C · Eliminates the need for other conservation practices
Terracing complements other conservation practices but does not eliminate their need.
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Which terrain is most suitable for broad-based terraces?
B · Moderate slopes with gentle gradient
Broad-based terraces are suitable for moderate slopes where mechanized farming is possible.
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Terracing is most effective in which of the following applications?
A · Controlling erosion on steep agricultural lands
Terracing is primarily used to control soil erosion on steep agricultural slopes.
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Refer to the slope profile diagram below. If the vertical interval (VI) is 3 m and the slope length between terraces is 20 m, what is the slope percentage? Use \( S = \frac{VI}{L} \times 100 \).
A · 15%
Slope percentage \( S = \frac{3}{20} \times 100 = 15\% \).
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Using Ramser's formula \( VI = \frac{100}{S} \), where S is slope percentage, calculate the vertical interval for a slope of 5%.
A · 20 m
Using the formula, \( VI = \frac{100}{5} = 20 \) m.
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Refer to the diagram below of a terrace layout plan. If the terrace length is 25 m and the vertical interval is 2.5 m, what is the slope percentage?
A · 10%
Slope percentage \( S = \frac{VI}{L} \times 100 = \frac{2.5}{25} \times 100 = 10\% \).
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If the vertical interval (VI) is 4 m and the slope is 20%, what is the terrace length (L)? Use \( L = \frac{VI}{S} \), where S is slope in decimal.
A · 20 m
Slope as decimal = 20% = 0.20\( L = \frac{4}{0.20} = 20 \) m.
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Which of the following best defines terracing in soil conservation?
C · A practice of creating level platforms on slopes to reduce runoff velocity and soil erosion
Terracing involves creating level platforms or steps on slopes to reduce runoff velocity and prevent soil erosion.
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What is the primary purpose of terracing in hilly agricultural lands?
B · To convert steep slopes into a series of level steps to reduce soil erosion
Terracing converts steep slopes into level steps, which reduces runoff velocity and soil erosion.
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Which statement correctly describes terracing as a soil conservation measure?
C · Terracing creates a series of embankments or steps on slopes to reduce erosion
Terracing involves constructing physical steps or embankments on slopes to reduce erosion.
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Which of the following is NOT a purpose of terracing in soil conservation?
D · Increasing slope gradient to accelerate water flow
Terracing reduces slope gradient and runoff velocity; it does not increase slope gradient.
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Which type of terrace is characterized by a nearly level bench with a vertical face on the upper side and a gentle slope on the lower side?
B · Bench terrace
Bench terraces have a level bench with a vertical or steep riser on the upper side and a gentle slope on the lower side.
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Broad-base terraces are primarily constructed to control soil erosion on slopes ranging from:
B · 3-10%
Broad-base terraces are suitable for gentle slopes generally between 3% and 10%.
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Which terrace type is most suitable for steep slopes where land is limited and soil erosion is severe?
C · Narrow-base terrace
Narrow-base terraces are used on steep slopes with limited land to control severe erosion.
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Refer to the schematic layout below. Which terrace type is represented by a wide base with gentle slope and minimal vertical riser?
B · Broad-base terrace
The wide base and gentle slope with minimal vertical riser indicate a broad-base terrace.
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Which of the following design parameters is NOT typically considered in terrace design?
D · Soil pH level
Soil pH is a chemical property and not a design parameter for terraces.
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If the vertical interval (VI) of a terrace is 2 meters and the slope of the land is 10%, what is the approximate horizontal interval (HI) of the terrace? (Use \( HI = \frac{VI}{Slope} \))
A · 20 m
Given VI = 2 m and slope = 10% = 0.10, \( HI = \frac{2}{0.10} = 20 \) meters.
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Refer to the graph below showing slope percentage versus vertical interval. For a slope of 15%, what is the recommended vertical interval according to the graph?
C · 2.0 m
According to the graph, at 15% slope, the vertical interval recommended is 2.0 m.
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Which slope limit is generally considered suitable for constructing bench terraces to prevent soil erosion?
C · 10% to 30%
Bench terraces are typically constructed on slopes ranging from 10% to 30%.
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Which material is commonly used for constructing the riser portion of bench terraces to ensure stability?
B · Compacted soil with stone pitching
Compacted soil with stone pitching is used to stabilize the riser and prevent erosion.
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Which construction technique is essential for ensuring the durability of terraces on steep slopes?
B · Providing proper drainage channels and compacted risers
Proper drainage and compacted risers prevent terrace failure and erosion on steep slopes.
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Refer to the diagram below showing a cross-section of a terrace. Which part is labeled as the 'riser'?
B · The vertical or steep face between two benches
The riser is the vertical or steep face between two terrace benches.
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Which of the following is a major advantage of terracing in soil conservation?
B · Allows cultivation on steep slopes by reducing erosion
Terracing reduces erosion and allows cultivation on steep slopes.
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Which of the following is a limitation of terracing as a soil conservation measure?
B · It requires high initial investment and maintenance
Terracing requires significant initial cost and maintenance to remain effective.
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Which of the following soil and slope conditions is most suitable for broad-base terraces?
B · Clay soils on slopes between 3% and 10%
Broad-base terraces are suitable for moderate slopes (3%-10%) and clay soils.
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For which of the following slope ranges is terracing generally NOT recommended due to high construction difficulty and cost?
D · Above 40%
Slopes above 40% are generally too steep for terracing due to construction difficulty and cost.
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Which terrace type is most appropriate for soils prone to waterlogging and gentle slopes?
B · Broad-base terrace
Broad-base terraces with gentle slopes help in drainage and prevent waterlogging.
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Compared to contour bunding, terracing is generally preferred because it:
B · Is more effective on steep slopes by creating level platforms
Terracing creates level platforms which are more effective on steep slopes than contour bunding.
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Which of the following mechanical conservation measures is most similar to narrow-base terraces in terms of slope suitability?
A · Contour bunds
Narrow-base terraces and contour bunds are both suitable for steep slopes.
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Refer to the table below comparing mechanical conservation measures. Which measure has the highest initial cost but provides the best erosion control on steep slopes?
C · Bench terracing
Bench terracing has the highest initial cost but is most effective on steep slopes.
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Which of the following maintenance activities is essential to ensure the longevity of terraces?
B · Periodic repair of terrace risers and drainage channels
Maintaining risers and drainage channels prevents terrace failure and erosion.
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Which factor most significantly affects the cost of terrace construction?
B · Slope steepness and terrace type
Steeper slopes and complex terrace types increase construction cost.
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What is the primary purpose of a check dam in soil conservation?
B · To reduce soil erosion by slowing down water flow
Check dams are constructed to reduce the velocity of surface runoff, thereby minimizing soil erosion and promoting sediment deposition.
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Which of the following best defines a check dam?
B · A small barrier built across drainage channels to reduce flow velocity
Check dams are small barriers built across drainage channels or gullies to reduce runoff velocity and control erosion.
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Which of the following is NOT a purpose of check dams?
C · To increase the speed of water flow downstream
Check dams reduce the speed of water flow to prevent erosion; increasing flow speed is contrary to their purpose.
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Which of the following best describes the purpose of check dams in watershed management?
B · To reduce soil erosion and promote groundwater recharge
Check dams help in reducing soil erosion by slowing runoff and promote groundwater recharge by increasing infiltration.
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Which of the following is NOT a common type of check dam?
D · Contour bunding check dam
Contour bunding is a separate soil conservation measure and not a type of check dam.
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Which type of check dam is most suitable for temporary erosion control in small gullies?
C · Brushwood check dam
Brushwood check dams are inexpensive and suitable for temporary erosion control in small gullies.
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Which of the following materials is commonly used in the construction of gabion check dams?
B · Wire mesh filled with stones
Gabion check dams consist of wire mesh cages filled with stones, providing flexibility and permeability.
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Which type of check dam is most durable and suitable for permanent soil conservation structures?
B · Stone masonry check dam
Stone masonry check dams are durable and suitable for permanent installations.
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Which of the following is a disadvantage of brushwood check dams compared to stone masonry check dams?
B · Lower durability and shorter lifespan
Brushwood check dams have lower durability and are suitable only for temporary use compared to stone masonry dams.
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Which of the following is NOT a key site selection criterion for constructing a check dam?
D · Distance from the nearest highway
Distance from highways is generally not a critical factor in selecting a site for check dams.
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Which slope range is generally considered suitable for check dam construction in gullies to effectively reduce erosion?
B · 2% to 10%
Moderate slopes between 2% and 10% are suitable for check dams to reduce runoff velocity and prevent erosion.
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Which of the following site conditions is most favorable for check dam construction to maximize groundwater recharge?
B · Permeable soil with gentle slope
Permeable soil with gentle slope allows water to infiltrate and recharge groundwater effectively behind check dams.
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Which of the following is a critical factor to consider when selecting the location of a check dam to avoid structural failure?
A · Presence of a stable foundation with minimal erosion risk
A stable foundation is essential to prevent undermining and failure of the check dam structure.
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Refer to the diagram below showing a cross-section of a check dam site.
Which parameter is represented by the vertical height from the base to the crest of the dam?
B · Dam height (H)
The vertical height from the base to the crest is the dam height (H), a key design parameter.
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Which material is preferred for constructing a permanent check dam in a rocky gully bed to ensure longevity and stability?
C · Stone masonry
Stone masonry is preferred in rocky gullies for permanent, stable, and durable check dams.
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Which design parameter is crucial to prevent overtopping and failure of a check dam during peak runoff?
C · Freeboard height
Freeboard height is the additional height above maximum water level to prevent overtopping during floods.
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Which of the following design parameters directly influences the volume of water stored behind a check dam?
A · Dam height
Dam height controls the maximum water depth and thus the volume stored behind the dam.
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Which of the following construction materials provides permeability to check dams, allowing seepage and reducing hydrostatic pressure buildup?
C · Gabion baskets
Gabion baskets are permeable, allowing water seepage and reducing pressure on the dam structure.
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Which of the following is a hydrological benefit of check dams in watershed management?
B · Reduction in surface runoff velocity and volume
Check dams reduce runoff velocity and volume, thus controlling floods and erosion.
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How do check dams contribute to soil conservation in degraded watersheds?
B · By trapping sediments and stabilizing gullies
Check dams trap sediments and reduce gully erosion, thus conserving soil.
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Which of the following benefits is a direct result of check dams promoting groundwater recharge?
B · Increased base flow in streams during dry periods
Groundwater recharge from check dams increases base flow in streams during dry periods.
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Which of the following is a limitation of check dams in soil conservation?
B · They are ineffective on steep slopes with high runoff velocity
Check dams may fail or be ineffective on very steep slopes with high runoff velocity unless properly designed.
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Which maintenance activity is essential for the effective functioning of check dams?
A · Regular removal of trapped sediments
Removing trapped sediments prevents dam overtopping and maintains storage capacity.
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Which of the following is a common cause of check dam failure if not properly maintained?
A · Sediment accumulation leading to overtopping
Sediment accumulation reduces storage and may cause overtopping and structural failure.
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Which of the following is a limitation of check dams compared to contour bunding?
B · Check dams require suitable drainage channels for construction
Check dams require well-defined drainage channels, unlike contour bunding which can be applied on slopes without channels.
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Compared to check dams, contour bunding is more effective in controlling which type of erosion?
B · Sheet and rill erosion on slopes
Contour bunding is designed to control sheet and rill erosion on slopes, while check dams control gully erosion.
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Which mechanical conservation measure is best suited for stabilizing large gullies where check dams may not be feasible?
C · Gully plugs or drop structures
Gully plugs or drop structures are used for stabilizing large gullies where check dams alone may not suffice.
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Which of the following statements correctly compares check dams and graded bunding?
B · Graded bunding is designed to reduce slope length and velocity, check dams reduce channel flow velocity
Graded bunding reduces slope length and runoff velocity on slopes, while check dams reduce velocity in channels.
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Which mechanical conservation measure is most appropriate for controlling erosion on steep agricultural slopes where check dams cannot be constructed?
D · Terracing
Terracing is suitable for steep slopes where check dams are not feasible.
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Refer to the schematic diagram below showing a check dam and a contour bund on a slope.
Which structure is more effective in reducing gully erosion as shown in the diagram?
A · Check dam
Check dams are specifically designed to control gully erosion by reducing flow velocity in channels.
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What is the primary purpose of a check dam in soil conservation?
A · To increase groundwater recharge by slowing runoff
Check dams are small barriers constructed across drainage channels to slow down water flow, thereby increasing groundwater recharge and reducing soil erosion.
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Which of the following best defines a check dam?
B · A small barrier built across gullies to reduce water velocity
Check dams are small barriers constructed across gullies or drainage lines to reduce the velocity of flowing water and prevent soil erosion.
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Which of the following is NOT a purpose of check dams?
D · Generating electricity
Check dams are designed for soil and water conservation, not for electricity generation.
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Which statement best explains why check dams are effective in gully control?
B · They trap sediment and reduce water velocity, preventing further erosion
Check dams reduce water velocity and trap sediments, which stabilizes gullies and prevents further erosion.
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Which of the following is NOT a common type of check dam?
D · Contour trench check dam
Contour trench is a soil conservation measure but not classified as a type of check dam.
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Which type of check dam is most suitable for temporary gully control in forested areas?
B · Log check dam
Log check dams are often used in forested areas for temporary control due to availability of timber and ease of construction.
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Which of the following types of check dams is characterized by the use of wire mesh filled with stones?
A · Gabion check dam
Gabion check dams consist of wire mesh cages filled with stones, providing flexibility and permeability.
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Which type of check dam is preferred for permanent structures in rocky terrain due to its durability?
A · Stone masonry check dam
Stone masonry check dams are durable and suitable for permanent installations in rocky areas.
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Identify the odd one out among the following types of check dams based on construction material:
C · Contour bunding
Contour bunding is a soil conservation method but not a type of check dam.
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Which of the following is NOT a critical design parameter for a check dam?
C · Color of construction material
Color of construction material does not affect the design or function of check dams.
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For a check dam designed to control a gully with a catchment area of 10 hectares, which design parameter is most important to determine?
A · Maximum water discharge during peak flow
Maximum water discharge helps in sizing the dam to withstand peak flows without failure.
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Which parameter is essential to decide the spacing between successive check dams in a gully?
A · Slope of the gully bed
Slope of the gully bed influences the velocity of flow and thus determines the spacing between check dams.
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Refer to the diagram below showing a cross-section of a check dam. Which dimension represents the freeboard height?
A · Distance from the crest to the maximum water level
Freeboard is the vertical distance between the maximum water level and the crest of the dam to prevent overtopping.
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Which material is most commonly used for constructing permanent check dams in rocky terrains?
A · Stone masonry
Stone masonry is durable and suitable for permanent check dams in rocky areas.
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Which of the following materials is preferred for temporary check dams in forested catchments?
A · Logs and brushwood
Logs and brushwood are readily available and suitable for temporary check dams in forested areas.
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Which property is most important for materials used in check dam construction?
A · Durability and resistance to water erosion
Materials must be durable and resistant to erosion to ensure the longevity of the check dam.
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Which combination of materials is commonly used in gabion check dams?
A · Wire mesh and stones
Gabion check dams use wire mesh cages filled with stones to form a permeable and flexible structure.
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Which of the following is NOT a suitable site selection criterion for check dams?
D · Areas with no water flow
Check dams are constructed where water flow exists; areas with no water flow are unsuitable.
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Which factor is crucial when selecting a site for a check dam to ensure effective sediment deposition?
A · Gentle slope of the gully bed
Gentle slope reduces water velocity, promoting sediment deposition behind the check dam.
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Which site condition would make check dam construction most challenging?
A · Highly permeable soil with steep slopes
Steep slopes with highly permeable soil increase runoff velocity and reduce dam stability, making construction difficult.
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Refer to the site layout sketch below. Which location is most suitable for constructing a check dam to control gully erosion?
C · At point C where the slope is moderate and channel narrows
A moderate slope with a narrow channel is ideal for check dam construction to effectively reduce flow velocity and trap sediment.
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Which hydrological factor is most important in the design of a check dam?
A · Peak discharge during storm events
Peak discharge determines the maximum flow the check dam must safely handle without failure.
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Which hydraulic parameter is critical to ensure the stability of a check dam against overtopping?
A · Freeboard height
Freeboard height provides safety margin to prevent overtopping during peak flows.
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Which of the following hydraulic considerations is essential for sediment deposition behind a check dam?
A · Reduction in flow velocity
Reducing flow velocity allows sediments to settle behind the dam, preventing downstream erosion.
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Refer to the hydrological flow diagram below. What does the peak flow rate \( Q_p \) indicate in check dam design?
A · Maximum expected discharge during a storm
Peak flow rate \( Q_p \) is the highest expected discharge and is critical for sizing the check dam.
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Which of the following is a limitation of check dams?
A · They require regular maintenance to prevent siltation
Check dams trap sediment and require periodic maintenance to remove silt and maintain effectiveness.
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Which advantage is associated with check dams in soil conservation?
A · They promote groundwater recharge by slowing runoff
Check dams slow down runoff, allowing more water to infiltrate and recharge groundwater.
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Which of the following is a limitation of check dams in steep mountainous areas?
A · High risk of structural failure due to high flow velocities
In steep areas, high flow velocities can damage check dams unless carefully designed and maintained.
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Which of the following is NOT an advantage of check dams?
C · Complete elimination of downstream flooding
Check dams help reduce runoff velocity but do not completely eliminate downstream flooding.
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Which maintenance activity is essential for the effective functioning of check dams?
A · Periodic removal of accumulated sediment
Sediment accumulation reduces the storage capacity and effectiveness of check dams, so it must be removed regularly.
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Which environmental impact is a potential negative consequence of poorly maintained check dams?
A · Increased downstream sedimentation causing habitat degradation
If check dams fail or overflow due to poor maintenance, they can cause sudden sediment release downstream, harming habitats.
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Which of the following maintenance practices helps prolong the life of a check dam?
A · Regular inspection and repair of structural damages
Regular inspection and timely repair prevent dam failure and extend its functional life.
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Refer to the schematic diagram below of a check dam and its sediment deposition zone. Which area is most prone to silt accumulation?
A · Upstream side of the dam
Sediment settles upstream of the check dam where water velocity decreases.
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What is the primary purpose of gully plugging in soil conservation?
B · To prevent the formation and expansion of gullies
Gully plugging is primarily used to prevent the formation and expansion of gullies, thereby conserving soil and reducing erosion.
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Which of the following best defines gully plugging?
B · Filling or blocking of gullies to check soil erosion
Gully plugging involves filling or blocking gullies to prevent further soil erosion and land degradation.
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Which of the following is NOT a purpose of gully plugging?
C · To increase the velocity of runoff water
Gully plugging aims to reduce runoff velocity and soil erosion, not increase it.
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Which of the following is a correct statement about the purpose of gully plugging?
B · It helps in controlling soil erosion by stabilizing gullies
Gully plugging controls soil erosion by stabilizing gullies and preventing their expansion.
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Which of the following is NOT a type of gully plug?
D · Contour trenching
Contour trenching is a separate soil conservation measure and not a type of gully plug.
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Which type of gully plug is most suitable for areas with abundant stone availability and moderate flow?
B · Stone check dam
Stone check dams are suitable where stones are readily available and flow is moderate, providing durable gully plugging.
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Which of the following types of gully plugs involves planting grasses or shrubs to stabilize the gully?
C · Vegetative gully plug
Vegetative gully plugs use plants to stabilize soil and reduce erosion naturally.
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Which type of gully plug is most appropriate for steep gullies with high flow velocity and limited stone availability?
C · Concrete gully plug
Concrete gully plugs are suitable for steep gullies with high flow where durable and strong structures are needed.
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Which material is commonly used for constructing earthen gully plugs?
A · Clayey soil mixed with stones
Earthen plugs are usually constructed with clayey soil mixed with stones to provide strength and reduce seepage.
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Which of the following materials is preferred for stone check dams in gully plugging?
B · Angular stones with interlocking shapes
Angular stones with interlocking shapes provide better stability and strength for stone check dams.
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Which material is NOT suitable for gully plugging construction?
B · Loose sand
Loose sand is unsuitable as it is easily washed away and does not provide stability.
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Which of the following materials is most suitable for vegetative gully plugs?
A · Grass species with dense root systems
Grasses with dense roots help bind the soil and reduce erosion in vegetative gully plugs.
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Which material is preferred for constructing permanent gully plugs in high rainfall areas?
A · Concrete
Concrete provides durability and resistance to high flow and rainfall, making it suitable for permanent plugs.
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Which design parameter is crucial in determining the height of a gully plug?
A · Maximum expected water flow depth
The height of a gully plug must be sufficient to withstand the maximum expected water flow to prevent overtopping.
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Refer to the diagram below showing a cross-section of a stone check dam. Which part is critical for preventing seepage under the dam?
A · Foundation trench filled with compacted clay
A foundation trench filled with compacted clay prevents seepage beneath the dam, ensuring stability.
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Which construction technique is essential to ensure the stability of an earthen gully plug?
A · Compaction of soil in layers
Compaction of soil in layers increases density and strength, ensuring the plug's stability.
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Which design parameter is NOT typically considered in gully plug construction?
D · Color of soil
Soil color does not affect the design parameters of gully plugs.
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Which of the following is a key criterion for site selection for gully plugging?
A · Presence of active gully erosion with moderate slope
Sites with active gully erosion and moderate slope are suitable for gully plugging to effectively control erosion.
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Which soil condition is most suitable for constructing an earthen gully plug?
A · Soil with high clay content and low permeability
Soil with high clay content reduces seepage and provides stability for earthen plugs.
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Which of the following site characteristics makes gully plugging unsuitable?
A · Very wide and deep gullies with unstable banks
Very wide and deep gullies with unstable banks may require more complex measures than simple gully plugging.
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Refer to the site layout sketch below. Which location is most suitable for placing a gully plug to maximize effectiveness?
A · At the narrowest section of the gully
Placing the plug at the narrowest section reduces construction material and increases stability.
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Which of the following is an advantage of gully plugging?
B · Reduces sediment load in water bodies
Gully plugging reduces sediment transport by stabilizing gullies and trapping soil.
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Which of the following is a limitation of gully plugging?
A · Requires continuous maintenance to remain effective
Gully plugs require regular maintenance to repair damage and maintain effectiveness.
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Which of the following is an advantage of vegetative gully plugs compared to earthen plugs?
A · Lower initial cost and improved soil binding
Vegetative plugs are cost-effective and improve soil stability through root binding.
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Which of the following is NOT a limitation of gully plugging?
C · Is always a permanent solution without need for other measures
Gully plugging is not always permanent and often requires complementary measures.
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Which maintenance activity is essential for stone check dams used as gully plugs?
A · Removing accumulated sediment and repairing displaced stones
Removing sediment and repairing stones maintains the dam's effectiveness and stability.
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Which monitoring parameter is important to assess the performance of a gully plug?
A · Extent of gully erosion upstream
Monitoring the extent of gully erosion upstream helps evaluate the plug's effectiveness.
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Which of the following maintenance practices is recommended for vegetative gully plugs?
A · Regular watering and replanting of damaged vegetation
Maintaining vegetation through watering and replanting ensures continued soil stabilization.
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Which of the following is a positive impact of gully plugging on watershed management?
A · Reduced sediment load in downstream water bodies
Gully plugging reduces sediment transport, improving water quality and watershed health.
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How does gully plugging contribute to improved groundwater recharge?
A · By reducing runoff velocity and allowing water infiltration
Gully plugs slow runoff, allowing more water to infiltrate and recharge groundwater.
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Refer to the diagram below showing a watershed with multiple gully plugs. What is the expected overall impact on soil conservation?
A · Significant reduction in soil loss and improved land stability
Multiple gully plugs reduce soil loss and stabilize the watershed effectively.
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Which of the following is a negative impact if gully plugs are not properly maintained?
A · Failure of plugs leading to increased gully erosion
Poor maintenance can cause plug failure and worsen erosion.
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Refer to the diagram below showing a trapezoidal cross-section of a gully plug. If the side slopes are 2H:1V, the height is 3 m, and the bottom width is 4 m, what is the top width of the plug?
D · 14 m
