APPENDIX-VII Road Network the STUDY on SABO and FLOOD CONTROL for WESTERN RIVER BASINS of MOUNT PINATUBO in the REPUBLIC of the PHILIPPINES
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The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in the Republic of the Philippines Final Report Supporting Report APPENDIX-VII Road Network THE STUDY ON SABO AND FLOOD CONTROL FOR WESTERN RIVER BASINS OF MOUNT PINATUBO IN THE REPUBLIC OF THE PHILIPPINES FINAL REPORT SUPPORTING REPORT APPENDIX VII ROAD NETWORK Table of Contents Page CHAPTER 1 GENERAL............................................................................................... VII-1 1.1 Present Conditions.......................................................................................... VII-1 1.1.1 Present Road Network...................................................................... VII-1 1.1.2 Existing Road Development Plan..................................................... VII-1 1.1.3 Existing Bridges and Other Facilities ............................................... VII-1 1.2 Proposed Master Plan ..................................................................................... VII-2 1.2.1 Proposed Master Plan for Road Network......................................... VII-2 1.2.2 Proposed Master Plan for Bridge Reconstruction............................. VII-2 1.3 Feasibility Design ........................................................................................... VII-3 1.3.1 Feasibility Design of Reconstruction of the Bucao Bridge .............. VII-3 1.3.2 Feasibility Design of Community Road ........................................... VII-5 1.3.3 Detailed Design of the Maculcol Bridge .......................................... VII-5 CHAPTER 2 TRAFFIC SURVEY AND ANALYSIS................................................... VII-6 2.1 Traffic Survey ................................................................................................. VII-6 2.1.1 Objective........................................................................................... VII-6 2.1.2 Survey Location and Duration.......................................................... VII-6 2.1.3 Vehicle Classification ....................................................................... VII-6 2.2 Analysis of Survey Results............................................................................. VII-6 2.2.1 Survey Results and Estimation of Annual Average Daily Traffic..... VII-6 2.2.2 Traffic Analysis................................................................................. VII-7 2.2.3 Traffic Growth Rates ........................................................................ VII-7 2.2.4 Future Traffic Volume....................................................................... VII-7 i List of Tables Page Table 1.1.1 Measurement of Road and Bridge........................................................VII-T1 Table 1.2.1 Measurement of Proposed Bridge against Existing Bridge .................VII-T1 Table 1.3.1 Comparison Table of Bucao Bridge Location for Reconstruction of Bucao Bridge........................................................................................VII-T2 Table 1.3.2 Comparison Table of Alignment of Approach Road in Manila Side ...VII-T3 Table 1.3.3 Applicable Span Length and Superstructure Type...............................VII-T4 Table 1.3.4 Comparison Table of Bucao Bridge Type for Reconstruction .............VII-T5 Table 2.1.1 Station and Municipality......................................................................VII-T6 Table 2.1.2 Vehicle Classification...........................................................................VII-T6 Table 2.2.1 Expansion Factor 12 to 24-hour...........................................................VII-T7 Table 2.2.2 Daily Factors........................................................................................VII-T8 Table 2.2.3 Seasonal Factors...................................................................................VII-T8 Table 2.2.4 Summary of Annual Average Daily Traffic..........................................VII-T9 ii List of Figures Page Figure 1.1.1 Location Map of Plan of Province of Zambales and Proposed Master Plan for Road and Bridge Construction...................................VII-F1 Figure 1.2.1 Traffic Volume......................................................................................VII-F2 Figure 1.2.2 General View of the Bucao Bridge for Reconstruction........................VII-F3 Figure 1.2.3 General View of the Maloma Bridge for Reconstruction ....................VII-F4 Figure 1.2.4 General View of the Maculcol Bridge for Reconstruction...................VII-F5 Figure 1.3.1 Abutment Location of Manila Side of the Bucao Bridge for Reconstruction......................................................................................VII-F6 Figure 1.3.2 Abutment Location of Iba Side at Down Stream for Reconstruction..VII-F7 Figure 1.3.3 Abutment Location of Iba Side at Upper Stream Side for Reconstruction......................................................................................VII-F8 Figure 1.3.4 Location of the Bucao Bridge ..............................................................VII-F9 Figure 1.3.5 Plan of the Bucao Bridge for Reconstruction ....................................VII-F10 Figure 1.3.6 Vertical Curvature, Alternative 1, Down Stream Side for Reconstruction.................................................................................... VII-F11 Figure 1.3.7 Vertical Curvature, Alternative 2, Upper Stream Side for Reconstruction....................................................................................VII-F12 Figure 1.3.8 General View of the Bucao Bridge for Reconstruction......................VII-F13 Figure 1.3.9 Desirable Span for Flood Discharge ..................................................VII-F14 Figure 1.3.10 Location Map of Community Road ...................................................VII-F15 Figure 1.3.11 Plan and Profile for Detailed Design for the Maculcol Bridge (DPWH) .............................................................................................VII-F16 Figure 1.3.12 General Elevation and Part Plan of Detailed Design for the Maculcol Bridge (DPWH) .................................................................VII-F17 Figure 2.1.1 Locations of Traffic Count Survey.....................................................VII-F18 Figure 2.2.1 Annual Average Daily Traffic ............................................................VII-F19 Figure 2.2.2 Future Traffic Volume ........................................................................VII-F20 iii CHAPTER㧝 GENERAL 1.1 Present Conditions 1.1.1 Present Road Network The western river basins of Mount Pinatubo are located in the province of Zambales in Region III. It is bounded on the west by the South China Sea, east by Tarlac and Pampanga, south by Bataan and north by the Province of Pangasinan which belongs to Region I. The Iba South and North Roads are the major highways in the Province of Zambales and run straight from the south to the north along the South China Sea coast. The Botolan-Capas Road is the only highway that runs from west to east and connects with the other provinces of Central Luzon. However, this road lies at a significantly lower elevation and is not passable at present due to lahar deposits. Several rivers cross the Iba South Road. Provincial roads along these rivers extend from the river mouth to the middle stream. The length of the existing road network is shown in Table 1.1.1. The total length of national and provincial roads is 91.0 km and 95.0 km, respectively. National roads serve as the main trunk line especially for transporting goods and services. Provincial roads provide the same function to supplement the national roads. Current issues relating to the road network in Zambales are summarized as follows: (1) In the case of a natural disaster occurring, there is no alternative route to the Iba South Road. (2) There is no access road to residential areas in the upper stream part of Mount Pinatubo. (3) There is no access road to the crater lake of Mount Pinatubo which is a potential tourist attraction. 1.1.2 Existing Road Development Plan The existing road development plan is shown in Figure 1.1.1. The Zambales-Tarlac Road commences in Iba in the Province of Zambales and runs from west to east ending in Tarlac City. This section of road is under construction and approximately 30% of the total length (at the Zambales end) is completed. The Zambales-Pampanga Road commences in San Marcelino in the Province of Zambales and runs from west to east ending in the Province of Pampanga. Construction has not yet started. 1.1.3 Existing Bridges and Other Facilities Measurements for the existing bridges are shown in Table 1.1.1. There are 37 bridges that have been identified along the national roads with a total length of 2,162 m, and 30 bridges identified along provincial roads with a total length of 943 m. The average length of bridges along national roads is 60m and bridges along provincial roads have an average length of 30 m. The Maculcol Bridge, which crosses the Sto. Tomas River, is the longest bridge with a total length of 381 m, followed by the Bucao Bridge with a length of 300 m, which is considered the second oldest bridge built in 1939. The Sta.Rosa steel bridge is the oldest bridge built in 1930. VII-1 Current issues regarding the bridge conditions are summarized as follows: (1) The under clearance of the Bucao, Maloma and Maculcol Bridges is very small due to a significant volume of lahar deposits. No alternate or detour bridges are available for use in case