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Annex Vi : Flood Control the Feasibility Study of the Flood Control Project for the Lower Cagayan River in the Republic of the Philippines

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Annex Vi : Flood Control the Feasibility Study of the Flood Control Project for the Lower Cagayan River in the Republic of the Philippines The Feasibility Study of the Flood Control Project for the Lower Cagayan River in the Republic of the Philippines Final Report Supporting Report ANNEX VI : FLOOD CONTROL THE FEASIBILITY STUDY OF THE FLOOD CONTROL PROJECT FOR THE LOWER CAGAYAN RIVER IN THE REPUBLIC OF THE PHILIPPINES FINAL REPORT Volume VI-1 SUPPORTING REPORT ANNEX VI FLOOD CONTROL Table of Contents Page CHAPTER 1 PRESENT RIVER CONDITION......................................................... VI-1 1.1 Present River Condition..................................................................................... VI-1 1.1.1 River System ....................................................................................... VI-1 1.1.2 General Features of Present River Channel .......................................... VI-2 1.1.3 River Morphology ............................................................................... VI-3 1.2 Flood Damages.................................................................................................. VI-14 1.2.1 Bank Erosion and Sedimentation ......................................................... VI-15 1.2.2 Flood Inundation ................................................................................. VI-18 1.2.3 Flood Damages.................................................................................... VI-19 1.3 Existing Flood Control Projects (Structural Measures)....................................... VI-20 1.4 Flood Disaster Prevention System (Non-structural Measures)............................ VI-21 1.4.1 Existing Disaster Management Plans and Activities ............................. VI-21 1.4.2 Existing Flood Forecasting and Warning System.................................. VI-23 1.4.3 Existing Evacuation Center.................................................................. VI-24 1.5 Existing Flood Control Facilities and River Related Structures.......................... VI-25 1.5.1 Flood Control Facilities ....................................................................... VI-25 1.5.2 River Related Structures ...................................................................... VI-25 CHAPTER 2 LONG TERM FLOOD CONTROL PLAN .......................................... VI-28 2.1 Basic Concept of Flood Control......................................................................... VI-28 2.1.1 Target Area .......................................................................................... VI-28 2.1.2 Basic Concept...................................................................................... VI-28 2.1.3 Conditions for Formulating Flood Control Plan ................................... VI-29 2.1.4 Upper Cagayan .................................................................................... VI-31 2.1.5 Middle Cagayan................................................................................... VI-32 2.1.6 Lower Cagayan.................................................................................... VI-32 2.2 Alternative Study of Flood Control Long Term Plans (from Magapit to Tuguegarao) ...................................................................................................... VI-36 2.2.1 Objective Reaches of Alternative Study ............................................... VI-36 2.2.2 Flood Control Plan in the Magapit Narrows (Magapit to Alcala)................................................................................................. VI-36 2.2.3 Flood Control Plan in the Reach from Alcala to Buntun Bridge.................................................................................................. VI-38 2.2.4 Flood Control Plan in the Reach from Buntun Bridge to Tuguegarao.......................................................................................... VI-41 2.3 Structural Measures of Flood Control Long Term Plan in the Middle Lower Cagayan ................................................................................................. VI-43 VI - i 2.3.1 Selection of Optimum Plan .................................................................. VI-43 2.3.2 Reviewed Flood Control Long Term Plan ............................................ VI-45 2.3.3 Cost Estimate....................................................................................... VI-47 2.4 Non-structural Measures.................................................................................... VI-48 2.4.1 Evacuation System .............................................................................. VI-48 2.4.2 Resettlement ........................................................................................ VI-50 2.4.3 Hazard Map......................................................................................... VI-50 CHAPTER 3 FLOOD CONTROL PRIORITY PROJECTS ...................................... VI-52 3.1 Structural Measures ........................................................................................... VI-52 3.1.1 General................................................................................................ VI-52 3.1.2 Objective Priority Projects subject to Feasibility Study ........................ VI-52 3.1.3 Project Formulation Criteria ................................................................ VI-52 3.1.4 Structural Measures of Priority Projects for the Lower Cagayan River ..................................................................................... VI-55 3.1.5 Urgent Works of Bank Protection for the Lower Cagayan River.................................................................................................... VI-58 3.2 Non-structural Measures.................................................................................... VI-59 3.2.1 Evacuation System Improvement......................................................... VI-59 3.2.2 Resettlement Area Development .......................................................... VI-61 CHAPTER 4 PRELIMINARY DESIGN OF FLOOD CONTROL PRIORITY PROJECTS ....................................................................... VI-62 4.1 General.............................................................................................................. VI-62 4.1.1 Design Criteria .................................................................................... VI-62 4.1.2 River Channel Improvement ................................................................ VI-62 4.1.3 River and Related Structures................................................................ VI-68 4.1.4 Estimation of Bill of Quantities............................................................ VI-71 4.2 Non-structural Measures.................................................................................... VI-72 4.2.1 Flood Forecasting and Warning System Strengthening Project ............. VI-72 4.2.2 Evacuation Center Strengthening Project ............................................. VI-75 4.2.3 Resettlement Site Development Project................................................ VI-76 VI - ii List of Tables Page Table 1.2.1 Critical Bank Erosion Sites in Cagayan River and Tributaries............VI-T1 Table 1.2.2 Recorded Major Disasters from 1987 to 1999 in the Republic of the Philippines...............................................................................VI- T2 Table 1.2.3 Summary on the Effects of the Destructive Tropical Cyclones in the Republic of the Philippines (1990-1999)..................................VI- T3 Table 1.2.4 Flood Damages due to Typhoon in Region II/CAR ..........................VI- T12 Table 1.3.1 Ongoing Flood Control Projects in Region 2 Office (for the year 2000) .........................................................................................VI- T15 Table 1.3.2 Proposed Flood Control Projects in Region 2 Office (for the year 2001) .........................................................................................VI- T16 Table 1.3.3 Ongoing and Proposed Flood Control Projects by LGUs (Pesos million) ..................................................................................VI- T17 Table 1.4.1 Existing Evacuation Centers ............................................................VI- T18 Table 1.5.1 Existing Flood Control Structures in Cagayan River Basin ................VI- T27 Table 1.5.2 Principal Features of Magat Dam and Major Intake Weirs .................VI- T28 Table 1.5.3 Principal Features of Irrigation Pump Stations along Cagayan River .................................................................................................VI- T29 Table 1.5.4 Principal Features of Major Bridges ..................................................VI- T30 Table 2.2.1 Cost Estimate of Preliminary Study (Alcala to Buntun Bridge) ..............................................................................................VI- T31 Table 2.2.2 Cost Estimate of Preliminary Study (Buntun Bridge to Upstream of Tuguegarao) ..................................................................VI- T33 Table 2.3.1 Cost Estimate of Alternative Plans for Flood Control Long Term Plan..........................................................................................VI- T35 Table 2.3.2 Bank Protection Works in the Reviewed Flood Control Long Term Plan..........................................................................................VI- T39 Table 2.3.3 Quantities of Major Works of Other Schemes in the Reviewed Flood Control Long Term Plan (lowermost, middle and upper reaches).............................................................................VI-
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