road construction costs key concepts. types of main road works routine maintenance works are...
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ROAD CONSTRUCTION COSTSKey Concepts
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Types of Main Road Works• Routine Maintenance Works are day-to-day runningrepairs,
• e.g. Potholes, depressions, crack sealing etc.• Periodic Maintenance Works are planned,
• e.g. resurfacing works - expected to be undertaken every 10 years or so
• Rehabilitation or Up-gradation Works• Undertaken when the pavement is not providing an appropriate
level of service• Determined by roughness, distress and maintenance costs
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Interrelationships
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Cost Estimation Inputs• Pavement
• Traffic (current and future), existing condition, design life, type of pavement
• Bridges and other Cross Drainage Structures• Structural design or rehabilitation requirements• Type of the structure, life of the structure• Hydrology
• Ancillary works• Road Signs, Pavement markings etc.• Pedestrian facilities Road side drainage• Lighting etc.
• Environmental & Social Impact Management Measures• E.g. Land Acquisition
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Typical preparation for a Major Work
Data collection
• Surveying• Pavement Condition Assessments• Soil and Material Testing• Traffic • Drainage and Hydrological Studies
Designing
• Pavement Design• Structural Design of Bridges• Identification of material sources• Environmental and Social Assessment
Estimation
• Quantify Takeoff• Estimating Unit rates for the items.• Finalize time for construction• Usually ends with Economic justification of the investments
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Remember : Triple Constraint
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Possible Reasons for Cost Variance • Size of the Project• Location of the Project• Construction Time• Heterogeneous Specifications • Market Competition• Reliability of Funding• Oversight/Governance• Procurement and Contract Management Procedures• Tax Structure (Exemptions)• Contracting Methodology
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Possible Source of Cost Estimates
• Detailed Design Reports• Historical Unit Rates • Road Agency’s Database of Major Contracts
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Cost per KM for Recent Road Contracts
25-180 Km 10-25 Km <10 Km
Size does matter!!
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Cost Per Km & Source of Funding
Bank Funded ADBGOL
Stable Funding helps!!
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Cost Per Km & Procurement Method
ICB NCB Sole SourcedLIB
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Cost Per Km & Contracting Methodology
DBOMT DBT INPUT
Performance Contracts Perform!!
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Questions?