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UNDERSTANDING OF ROADSIDE DRAINAGES & THEIR IMPACTS

This presentation provides insights into water movement, drainage types, configurations, impacts on roads and communities, watershed understanding, drainage outlets, and the role of engineers in designing effective drainage systems. It also emphasizes the importance of proper planning, design, and maintenance to mitigate drainage-related issues.

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UNDERSTANDING OF ROADSIDE DRAINAGES & THEIR IMPACTS

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  1. EXPERINCE SHARING ON UNDERSTANDING OF ROADSIDE DRAINAGES & THEIR IMPACTS Kinzang Wangchuk Dy. Executive Engineer ORIO-RGOB Project July 23, 2018

  2. PRESENTATION OUTLINES • Overview understanding of Water movement. • Types of drainages • Choices of Drain configuration in road works • Practices in DoR • Impacts of road side drainages to the road and public properties • Conclusions and Recommendations

  3. PRESENTATION OUTLINES • Overview understanding of Watersheds • Global water source • Country’s watershed & dendritic pattern • Watershed of project area • Drainages outlets and their Impacts. • Role of Geometric/Pavement designer and construction engineer • Drainage Outlets vs community • Conclusions

  4. Watershed in Global Perspective

  5. Country’s Dendritic Pattern

  6. Khundrungay Watershed of Project a Area Homa Khola Sunkosh river

  7. Drain Outlets vs Road 6 • Drainage system includes: • Catchment area • Soil conditions • Road geometry • Cross falls • Pavement designs • Drainage outlets • Cross drainage spacing • Open drains • Under ground drains • Soil types 4 5 Impacts: • Erosions due to outlet discharge 3 2 1 Planning, Designing & Construction phases

  8. u/s culvert choked & submerged by debris IMPACTS Formation of new drain by runoff Gabion cascade Choked culvert

  9. IMPACTS Road bend failure Road edge scoring Road edge failure R/wall Toe Failure

  10. Role of geometric/Pavement designer & construction engineer GEOLOGICAL MAP OF BHUTAN

  11. Role of geometric/Pavement designer & construction engineer Source of water in Roads

  12. Role of geometric/Pavement designer & construction engineer Understanding of water movements

  13. Role of Geometric/Pavement designer & construction engineer Roadway & Roadside Drainage

  14. Role of Geometric/Pavement designer & construction engineer Choice of Appropriate structures

  15. DRAINAGE OUTLETS VS COMMUNITY Deorali Village • Impacts: • Damage to public properties • No outlet space • Alteration of drAIN DESIGN

  16. CONCLUSIONS • Review of Road design guide lines is suggested incorporating following items: • Designing and planning of drainage system • Design of erosion and sedimentation control. • Good management Practices (GMP) in drainage constructions. • Present practice of roadside drains may be reviewed further.

  17. CONCLUSIONS 2. An adequate time to be allocated for planning and design phases. 3. A thorough review is needed by a group of expertise for any designs submitted by consultancy firms before acceptance 4. Drainage outlet rights to be incorporated in road Act. 5. In-house capacity building by road specialists and principal engineers to fresh and young engineers.

  18. FUNS ON ROAD TERMINOLOGY • Permanent works (PW) • Box cutting Permanent works (PW) = “Long term Structures” Box cutting =“Through cutting or in cutting”

  19. THANK YOU FOR YOUR KIND ATTENTION

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