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E. Drainage Facility Plan E. DRAINAGE FACILITY PLAN E - i TABLE OF CONTENTS Page E.1 GENERAL .................................................................................................................. E - 1 E.2 PREVIOUS STUDIES AND PLANNED PROJECTS OF FLOOD CONTROL AND DRAINAGE IMPROVEMENT.......................................................................................................... E - 2 E.2.1 General .................................................................................................................... E - 2 E.2.2 Previous Flood Control and Drainage Improvement Plans..................................... E - 2 E.2.3 Current Studies Related to Drainage Improvement in the Core Area ................... E - 12 E.3 COMPLETED AND ONGOING FLOOD CONTROL AND DRAINAGE IMPROVEMENT PROJECTS IN THE CORE AREA................................................................................ E - 16 E.3.1 General .................................................................................................................. E - 16 E.3.2 Completed Projects ............................................................................................... E - 16 E.3.3 Ongoing Projects................................................................................................... E - 20 E.4 DRAINAGE CONDITIONS ......................................................................................... E - 24 E.4.1 Drainage System in the Core Area........................................................................ E - 24 E.4.2 Drainage Facilities................................................................................................. E - 31 E.4.3 Drainage Basin ...................................................................................................... E - 39 E.4.4 Drainage Channels ................................................................................................ E - 55 E.4.5 Necessity of Additional Work ........................................................................... E - 75 E.4.6 Problems and Constraints in the Drainage Sector ................................................. E - 76 E.5 DRAINAGE IMPROVEMENT PLAN ........................................................................... E - 78 E.5.1 Basic Concept and Conditions for Formulating Drainage Improvement Plan...... E - 78 E.5.2 Basic Consideration of Drainage Improvement Plan ............................................ E - 83 E.5.3 Improvement Plan for Drainage Channels ............................................................ E - 99 E.5.4 Improvement Plan for Drainage Pumping Stations.............................................. E - 109 E.5.5 Non-Structural Measures...................................................................................... E - 115 E.5.6 Supporting Measures............................................................................................ E - 116 E.5.7 Feature and Phasing of Structural Measures ........................................................ E - 117 E.5.8 Priority Projects.................................................................................................... E - 126 ANNEX E.1 LONGITUDINAL PROFILE OF DRAINAGE CHANNELS ANNEX E.2 CALCULATION OF PROBABLE PEAK DISCHARGE ANNEX E.3 PRELIMINARY EXAMINATION OF DIMENSION OF STOP LOG GATE ANNEX E.4 PRELIMINARY EXAMINATION OF ADDITIONAL WORKS FOR DRAINAGE CHANNELS ANNEX E.5 ALTERNATIVE STUDY E - ii LIST OF TABLES Page Table E.2.1 Major Studies and Planned Projects................................................................ E - 2 Table E.2.2 Master Plan Framework Priority Projects ....................................................... E - 4 Table E.2.3 Planned Sewerage Projects............................................................................ E - 13 Table E.2.4 Planned Sanitation Projects........................................................................... E - 13 Table E.2.5 Structure of the Disater Management Plan for Metro Manila....................... E - 15 Table E.3.1 Drainage Improvement Project ..................................................................... E - 16 Table E.3.2 Features of Constructed Drainage Pumping Stations (1/3) ........................... E - 17 Table E.3.3 Features of Constructed Drainage Pumping Stations (2/3) ........................... E - 18 Table E.3.4 Features of Constructed Drainage Pumping Stations (3/3) ........................... E - 18 Table E.3.5 Small Pumping Stations ................................................................................ E - 18 Table E.4.1 Definition of Drainage Channels and Facilities ............................................ E - 24 Table E.4.2 Major Dimensions of Each Drainage Block in North Manila....................... E - 24 Table E.4.3 Major Dimensions of Each Drainage Block in South Manila....................... E - 25 Table E.4.4 Total Drainage Capacity and Area of Drainage Basin for Large Pumping Stations........................................................................... E - 32 Table E.4.5 Detailed Design Dimensions of Large Drainage Pumping Stations.............. E - 33 Table E.4.6 Tide Gauge Elevation.................................................................................... E - 34 Table E.4.7 Total Operating Hours of Pumps at Major Stations ...................................... E - 34 Table E.4.8 Annual Operating Hours and Fuel Consumption of Drainage Pumping Stations....................................................................... E - 35 Table E.4.9 Capacities of Small Pumping Stations .......................................................... E - 36 Table E.4.10 Dimensions of Floodgates............................................................................. E - 37 Table E.4.11 Outline of Present Sewerage Systems in Metropolitan Manila..................... E - 38 Table E.4.12 Sub-Basin for North Drainage Area.............................................................. E - 42 Table E.4.13 Sub-Basin for South Drainage Area.............................................................. E - 43 Table E.4.14 Runoff Coefficient by Land Use ................................................................... E - 45 Table E.4.15 Summary of Land Use in the Study Area...................................................... E - 47 Table E.4.16 Summary of Runoff Coefficient of the Study Area....................................... E - 47 Table E.4.17 Comparison of Pump Drainage Basins by Different Studies ........................ E - 48 Table E.4.18 Increase in Runoff Coefficients of Pump Drainage Basins........................... E - 49 Table E.4.19 Runoff Coefficient by Future (Planned) Land Use ....................................... E - 51 Table E.4.20 Future (Planned) Runoff Coefficient by Reach Basin for North Manila ...... E - 53 Table E.4.21 Future (Planned) Runoff Coefficient by Reach Basin for South Manila ...... E - 54 Table E.4.22 Main Dimensions of Esteros/Creeks ............................................................. E - 59 Table E.4.23 Dimensions of Drainage Mains (1/2) ............................................................ E - 63 Table E.4.23 Dimensions of Drainage Mains (2/2) ............................................................ E - 64 Table E.4.24 Estimated Probable Peak Discharge (1/2)..................................................... E - 69 Table E.4.24 Estimated Probable Peak Discharge (2/2)..................................................... E - 70 Table E.4.25 Dredging Volume from Esteros/Creeks (1/2)................................................ E - 73 Table E.4.25 Dredging Volume from Esteros/Creeks (2/2)................................................ E - 74 Table E.5.1 Objective Drainage Channels and Facilities ................................................. E - 78 Table E.5.2 Definition of Category of Drainage Channels............................................... E - 79 Table E.5.3 Design Scale for Additional Works............................................................... E - 82 Table E.5.4 Proposed Drainage Blocks ............................................................................ E - 93 Table E.5.5 Sub-Basin for Proposed Drainage Scheme (1/2)........................................... E - 96 Table E.5.5 Sub-Basin for Proposed Drainage Scheme (2/2)........................................... E - 97 E - iii Table E.5.7 Summary of Dredging and Declogging Volumes ......................................... E - 99 Table E.5.6 Estimated Probable Peak Discharge for Proposed Drainage Scheme (1/2)................................................................................. E - 103 Table E.5.6 Estimated Probable Peak Discharge for Proposed Drainage Scheme (2/2)................................................................................. E - 104 Table E.5.8 Stop Log Gate............................................................................................... E - 106 Table E.5.9 Proposed Additional Works for Drainage Channels (1/2) ........................... E - 107 Table E.5.9 Proposed Additional Works for Drainage Channels (2/2) ........................... E - 108 Table E.5.10 Discharge Capacity of Pumping Stations..................................................... E - 109 Table E.5.11 Criteria for Mechanical Checking and Diagnosis ........................................ E - 111 Table E.5.12 Criteria for Electrical Checking and Diagnosis............................................ E - 111 Table E.5.13 Technical Checking Results for
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