DRAFT Government of Nepal Ministry of Physical Planning and Works Department of Roads ROAD SECTOR DEVELOPMENT PROJECT (AF) (IDA GRANT NO: H629 – NP)(IDA CREDIT No: 4832 – NP) (New Project Preparation and Supervision Services) FEASIBILITY STUDY REPORT FOR UPGRADING OF Birgunj to Narayanghat Section MMM Group Ltd. (Canada) in JV with SAI Consulting Engineers (P) Ltd. (India) in association with ITECO Nepal (P) Ltd. (Nepal) & Total Management Services (Nepal) July 2011 Feasibility Study Report July 2011 Birgunj to Narayanghat Section TABLE OF CONTENTS EXECUTIVE SUMMARY 1 INTRODUCTION ........................................................................................................ 1-1 1.1 Background ...................................................................................................... 1-1 1.2 Study Road Section .......................................................................................... 1-1 1.3 Fesibility Study ................................................................................................. 1-3 2 PROJECT DESCRIPTION ......................................................................................... 2-1 2.1 Project Roads ................................................................................................... 2-1 2.2 Study Options ................................................................................................... 2-4 2.3 Improvement Standards ................................................................................... 2-4 2.3.1 Asian Highway Standards .............................................................................. 2-4 2.3.2 Recommended Standards .............................................................................. 2-4 3 FIELD WORK ............................................................................................................. 3-1 3.1 Desk Study ....................................................................................................... 3-1 3.2 Road Inventory and Engineer’s Survey ............................................................ 3-1 3.3 Hydrological Survey ......................................................................................... 3-1 3.4 Construction Material Investigation .................................................................. 3-1 3.5 Bio-Engineering Survey .................................................................................... 3-1 3.6 Traffic Survey ................................................................................................... 3-2 3.7 Pavement and Subgrade Investigations ........................................................... 3-2 3.8 Environmental Survey ...................................................................................... 3-2 3.9 Social Survey ................................................................................................... 3-2 4 BRIDGE INVENTORY WORK .................................................................................... 4-1 4.1 Inventory Work ................................................................................................. 4-1 4.2 General Condition of Bridges ........................................................................... 4-1 4.3 New Bridges ..................................................................................................... 4-4 4.3.1 Karra Bridge ................................................................................................... 4-4 4.3.2 Existing Causeways ....................................................................................... 4-4 4.4 Recommendations ........................................................................................... 4-5 5 HYDROLOGICAL STUDIES ...................................................................................... 5-1 5.1 General ............................................................................................................. 5-1 5.2 Rainfall Analysis ............................................................................................... 5-1 5.3 Design Flood Estimation .................................................................................. 5-4 5.4 Drainage Design ............................................................................................... 5-4 5.4.1 Drainage Facilities .......................................................................................... 5-4 5.4.2 Design Criteria ............................................................................................... 5-5 5.4.3 Cross Drains .................................................................................................. 5-5 5.4.4 Side Drains ..................................................................................................... 5-6 6 GEOLOGICAL STUDY ............................................................................................... 6-1 6.1 Regional Geology and Geomorphology ........................................................... 6-1 6.2 Surface Geology ............................................................................................... 6-1 6.3 Slope Stability Conditions ................................................................................. 6-2 6.4 Hazard Assessment ......................................................................................... 6-3 Road Sector Development Project (AF), (IDA Grant No: H629-NP, IDA Credit No:4832-NP) New Project Preparation & Supervision Page -i Feasibility Study Report July 2011 Birgunj to Narayanghat Section 7 BIO-ENGINEERING SURVEY ................................................................................... 7-1 7.1 General ............................................................................................................. 7-1 7.2 Field Survey ..................................................................................................... 7-1 7.3 Nursery ............................................................................................................. 7-1 7.4 Site Assessment and Identification for Bio-engineering Application for Slope Protection ........................................................................................................ 7-1 7.5 Design of Bio-engineering Works ..................................................................... 7-2 7.5.1 Design of Vegetative Structures ..................................................................... 7-2 7.6 Cost Estimates ................................................................................................. 7-4 7.7 Bio-engineering Planting Programme .............................................................. 7-4 8 CONSTRUCTION MATERIAL AND PAVEMENT INVESTIGATION ......................... 8-1 8.1 Material Source Survey and Testing ................................................................ 8-1 8.2 Material Sources .............................................................................................. 8-1 8.3 Laboratory Testing of Samples from Material Sources .................................... 8-5 8.4 Existing Road Sub-grade Investigation and Testing ........................................ 8-5 8.5 General Remarks on Test Results ................................................................. 8-12 8.5.1 Construction Material/Stability of the Pavement Structure ............................ 8-12 8.5.2 Sub-grade Material ....................................................................................... 8-12 9 TRAFFIC STUDY ....................................................................................................... 9-1 9.1 Introduction ....................................................................................................... 9-1 9.2 Desk Study ....................................................................................................... 9-1 9.3 Methodology ..................................................................................................... 9-1 9.4 2011 Traffic Estimate ....................................................................................... 9-3 9.5 Traffic Growth ................................................................................................... 9-3 9.6 Network-wide Traffic Mix .................................................................................. 9-7 9.7 Generated & Diverted Traffic ............................................................................ 9-7 9.8 Base Year 2016 Traffic ..................................................................................... 9-9 9.9 Recommendation for Road Carrriageway ...................................................... 9-12 10 PRELIMINARY ENGINEERING DESIGN ................................................................ 10-1 10.1 Data Entry and Calculation ............................................................................. 10-1 10.2 Design Standards ........................................................................................... 10-1 10.3 Pavement Design ........................................................................................... 10-4 10.3.1 General ........................................................................................................ 10-4 10.3.2 Existing Pavement Structure ........................................................................ 10-4 10.3.3 Existing Pavement Condition ........................................................................ 10-4 10.3.4 Pavement Structural Strength