👉Culvert & Drainage Construction (Design, Hydraulics & Site Practice – Practical & Technical) Job entrance exam!!
🚧1. What is a culvert?
A hydraulic structure provided to allow water to pass beneath roads, railways, or embankments.
🚧2. What are the main functions of culverts?
To safely convey surface runoff, prevent flooding, protect embankments, and maintain roadway stability.
🚧3. How are culverts classified based on shape?
Pipe culverts, box culverts, slab culverts, and arch culverts.
🚧4. How are culverts classified based on material?
Reinforced concrete, precast concrete, corrugated steel, masonry, and HDPE pipes.
🚧5. What factors govern culvert design?
Catchment area, rainfall intensity, discharge, soil condition, road geometry, and hydraulic head.
🚧6. How is discharge for culvert design estimated?
Using Rational Method, unit hydrograph, or flood frequency analysis.
🚧7. What is the Rational formula for runoff?
Q = C I A
Where C = runoff coefficient, I = rainfall intensity, A = catchment area.
🚧8. What is inlet control and outlet control in culverts?
Inlet control depends on entrance conditions; outlet control depends on downstream water level and channel conditions.
🚧9. What is headwater depth?
Water depth upstream of culvert entrance during design discharge.
🚧10. What is the importance of freeboard in culvert design?
Provides safety margin against overtopping and hydraulic uncertainties.
🚧11. What is a wing wall and its function?
A retaining wall provided at culvert ends to guide flow and retain embankment soil.
🚧12. What is apron and cut-off wall in culverts?
Apron prevents scour; cut-off wall prevents undermining of the structure.
🚧13. What causes failure of culverts?
Inadequate hydraulic capacity, poor foundation, scour, blockage, and poor construction quality.
🚧14. What construction sequence is followed for box culverts?
Foundation excavation, blinding, base slab casting, wall casting, slab casting, and backfilling.
🚧15. What precautions are taken during culvert foundation construction?
Dewatering, soil inspection, proper compaction, and alignment control.
🚧16. What materials are commonly used for road drainage systems?
Concrete drains, masonry drains, HDPE pipes, and precast elements.
🚧17. What is longitudinal drain and its purpose?
A drain running parallel to the road to collect and convey surface water.
🚧18. What is cross drainage and when is it required?
Drainage provided across the road alignment to pass natural water courses.
🚧19. What QA/QC checks are required in culvert construction?
Concrete strength tests, reinforcement inspection, level and alignment checks, and compaction tests.
🚧20. What records must be maintained for culvert and drainage works?
Hydrological calculations, drawings, inspection reports, concrete test results, and as-built drawings.
⭐️Our YouTube Channel👇
https://youtube.com/@ethiopianconstruction7?si=lDOVQ_4iWbv4KcBf
@etconp
🚧1. What is a culvert?
A hydraulic structure provided to allow water to pass beneath roads, railways, or embankments.
🚧2. What are the main functions of culverts?
To safely convey surface runoff, prevent flooding, protect embankments, and maintain roadway stability.
🚧3. How are culverts classified based on shape?
Pipe culverts, box culverts, slab culverts, and arch culverts.
🚧4. How are culverts classified based on material?
Reinforced concrete, precast concrete, corrugated steel, masonry, and HDPE pipes.
🚧5. What factors govern culvert design?
Catchment area, rainfall intensity, discharge, soil condition, road geometry, and hydraulic head.
🚧6. How is discharge for culvert design estimated?
Using Rational Method, unit hydrograph, or flood frequency analysis.
🚧7. What is the Rational formula for runoff?
Q = C I A
Where C = runoff coefficient, I = rainfall intensity, A = catchment area.
🚧8. What is inlet control and outlet control in culverts?
Inlet control depends on entrance conditions; outlet control depends on downstream water level and channel conditions.
🚧9. What is headwater depth?
Water depth upstream of culvert entrance during design discharge.
🚧10. What is the importance of freeboard in culvert design?
Provides safety margin against overtopping and hydraulic uncertainties.
🚧11. What is a wing wall and its function?
A retaining wall provided at culvert ends to guide flow and retain embankment soil.
🚧12. What is apron and cut-off wall in culverts?
Apron prevents scour; cut-off wall prevents undermining of the structure.
🚧13. What causes failure of culverts?
Inadequate hydraulic capacity, poor foundation, scour, blockage, and poor construction quality.
🚧14. What construction sequence is followed for box culverts?
Foundation excavation, blinding, base slab casting, wall casting, slab casting, and backfilling.
🚧15. What precautions are taken during culvert foundation construction?
Dewatering, soil inspection, proper compaction, and alignment control.
🚧16. What materials are commonly used for road drainage systems?
Concrete drains, masonry drains, HDPE pipes, and precast elements.
🚧17. What is longitudinal drain and its purpose?
A drain running parallel to the road to collect and convey surface water.
🚧18. What is cross drainage and when is it required?
Drainage provided across the road alignment to pass natural water courses.
🚧19. What QA/QC checks are required in culvert construction?
Concrete strength tests, reinforcement inspection, level and alignment checks, and compaction tests.
🚧20. What records must be maintained for culvert and drainage works?
Hydrological calculations, drawings, inspection reports, concrete test results, and as-built drawings.
⭐️Our YouTube Channel👇
https://youtube.com/@ethiopianconstruction7?si=lDOVQ_4iWbv4KcBf
@etconp
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