F. PRELIMINARY DESIGN F - i TABLE OF CONTENTS Page F.1 GENERAL .................................................................................................................. F - 1 F.2 OBJECTIVE PRIORITY PROJECTS ............................................................................... F - 1 F.2.1 Drainage Channel Facilities ..................................................................................... F - 1 F.2.2 Drainage Pumping Stations...................................................................................... F - 3 F.2.3 Non-Structural and Supporting Measures ................................................................ F - 3 F.3 PRELIMINARY DESIGN OF DRAINAGE CHANNEL FACILITIES ................................... F - 4 F.3.1 General ..................................................................................................................... F - 4 F.3.2 Inventory Survey of Underground and Related Facilities........................................ F - 4 F.3.3 Design Criteria for Drainage Facilities .................................................................... F - 5 F.3.4 Preliminary Design of Drainage Channel Facilities in North Manila .................... F - 10 F.3.5 Preliminary Design of Drainage Channel Facilities in South Manila .................... F - 18 F.3.6 Further Issues for extN Stage of Detailed Design.................................................. F - 28 F.4 REHABILITATION OF DRAINAGE PUMPING STATIONS ............................................ F - 29 F.4.1 General ................................................................................................................... F - 29 F.4.2 Rehabilitation Criteria for Drainage Pumping stations .......................................... F - 29 F.4.3 Rehabilitation of Drainage Pumping Stations........................................................ F - 31 F.5 NON-STRUCTURAL AND SUPPORTING MEASURES ................................................. F - 35 AEXN F.1 BLUMENTRITT INTERCEPTOR AEXN F.2 BUENDIA OUTFALL AEXN F.3 ZOBEL ROXAS DRAINAGE MAIN AEXN F.4 FARADAY DRAINAGE MAIN AEXN F.5 STRUCTURAL STUDY F - ii LIST OF TABLES Page Table F.3.1 Existing Depths of Earth Covering at Questioned Intersections ...................... F - 4 Table F.3.2 Present Conditions of Maintenance Holes ....................................................... F - 5 Table F.3.3 Design Scale for Additional Works.................................................................. F - 6 Table F.3.4 Major Soil Data in Pr iority Projects Areas....................................................... F - 7 Table F.3.5 Dimensions of Longitudinal Pr ofile of Estero de Sunog Apog...................... F - 12 Table F.3.6 Dimensions of Additional Box Culvert.......................................................... F - 15 Table F.3.7 Dimensions of Additional Box Culvert.......................................................... F - 24 Table F.3.8 Dimensions of Additional Box Culvert.......................................................... F - 26 Table F.4.1 Drainage Capacity of Pumping Stations ........................................................ F - 29 Table F.4.2 Present Pump Start/Stop Levels for Drainage Pumping Station .................... F - 30 Table F.4.3 Working Life of Pump Equi pment and Appurtenant Facilities...................... F - 31 Table F.4.4 Tentative Detailed Work Items to be Taken Up in Rehabilitation................. F - 33 Table F.5.1 Increase of Run-off Ratio by Basins of Drainage Pumping Stations ............. F - 36 Table F.5.2 Work Quantity of Observation Network........................................................ F - 40 LIST OF FIGURES Page Figure F.2.1 Locations of Priority Projects......................................................................... F - 2 Figure F.3.1 Image of Rehabilitation of Open Drainage Channels (Estero/Creek/Canal)...................................................................................... F - 8 Figure F.3.2 Ideal Typical Section of Open Channel and Its Easement ............................. F - 9 Figure F.3.3 Location Map of Priority Projects in North Manila ..................................... F - 10 Figure F.3.4 Schematic Location of Estero de Sunog Apog............................................. F - 11 Figure F.3.5 Route of Existing Blumentritt Interceptors .................................................. F - 12 Figure F.3.6 Image of Modification of Closed Maintenance Hole................................... F - 13 Figure F.3.7 Cross Section of Stop Log Gate to be Installed............................................ F - 13 Figure F.3.8 Proposed Route of Additional Blumentritt Interceptor ................................ F - 14 Figure F.3.9 Design Discharge of Additional Blumentritt Interceptor ............................. F - 15 Figure F.3.10 Image of Additional Box Culvert at Section of Rizal Avenue..................... F - 16 Figure F.3.11 Image of Inlet for Road Surface Flow.......................................................... F - 16 Figure F.3.12 Locations of Narrow sect ion of Existing Box Culvert ................................. F - 17 Figure F.3.13 Location Map of Priority Projects in South Manila ..................................... F - 18 Figure F.3.14 Schematic Locations of Objectiv e Channels to be Dredged/Cleaned .......... F - 19 Figure F.3.15 Schematic Route of Buendia Outfall............................................................ F - 21 Figure F.3.16 Present Condition of Outlet of Buendia Outfall........................................... F - 21 Figure F.3.17 Existing and Proposed Routes of obelZ Roxas Drainage Main ................... F - 22 Figure F.3.18 Design Discharge of Zobel Roxas Drainage Main....................................... F - 23 Figure F.3.19 Schematic Location Map of Pasong Tamo Drainage Main.......................... F - 24 Figure F.3.20 Existing and Additional Proposed Route of Faraday Drainage Main .......... F - 25 Figure F.3.21 Design Discharge of Faraday Drainage Main .............................................. F - 26 Figure F.5.1 Sample of Storm Water Retention Facility (Park) ....................................... F - 36 Figure F.5.2 Sample of Storm Water Retention Facility (Ground in School/University) F - 37 Figure F.5.3 Sample of Storm Water Retention by Permeable Pavement (Parking Area) F - 37 F - iii Figure F.5.4 Sample of Storm Water Retention Facility (Apartment Building)............... F - 37 Figure F.5.5 Sample of Storm Water Retention Facility (Tennis Court).......................... F - 38 Figure F.5.6 Sample of Various Storm Water Retention Facilities .................................. F - 38 Figure F.5.7 Locations of Additional Hydrological Equipment ....................................... F - 40 F - iv F.1 GENERAL The priority projects subject to a feasibility study were selected within the scope of the formulated drainage master plan. The scope of works of the priority projects consist of 1) rehabilitation and additional works for the drainage facilities and 2) rehabilitation and additional works for the drainage pumping stations. A preliminary design for the drainage facilities is made in this stage. Subsequently, a more detailed rehabilitation plan of the drainage pumping stations is examined with identification of rehabilitation work items by stations for the 12 stations. The result of the above design/study is described in the following. F.2 OBJECTIVE PRIORITY PROJECTS F.2.1 DRAINAGE CHANNEL FACILITIES The priority projects for the drainage channel f acilities identified in the master plan consist of rehabilitation and additional works for drainage channel facilities of estero/creek/canal/drainage main. Locations of objective drainage faciliti es and drainage pumping stations are presented in Figure F. 2.1. The following are the objective drainage facilities. (1) Rehabilitation and Additional Works of Drainage Channel Facilities in North Manila Estero de Sunog Apog - Dredging (Clearing) Blumentritt Interceptor - Declogging of existing interceptor and related works - Construction of additional interceptor by box culvert and remedial works (2) Rehabilitation and Additional Works of Drainage Channel Facilities in South Manila Estero de Tripa de Gallina, PNR Canal and Calatagan Creek I - Dredging (Clearing) Buendia Outfall - Declogging and related works Zobel Roxas Drainage Main - Declogging and construction of additional box culvert Pasong Tamo Drainage Main - Declogging Faraday Drainage Main - Declogging and construction of additional box culvert F - 1 Figure F.2.1 Locations of Priority Projects F - 2 F.2.2 DRAINAGE PUMPING STATIONS Presently there are 15 major drainage pumping stations in the core area. For the objective 12 aged drainage pumping stations identified in the master plan, a further detailed rehabilitation work items of repair and replacement of pump equipment and apparatus by stations will be examined in this stage. Those locations of aged pumping stations are shown in Figure F.2.1. The objective pumping stations will be as follows. - Aviles, At Aviles station, increase of pump capacity of 3m3/s is proposed in connection with the rehabilitation works as an additional work. - Quiapo, - Valencia, - Pandacan, - Paco, - Sta. Clara, - Tripa de Gallina, - Libertad, - Makati, - Binondo, - Escolta and Balete F.2.3 NON-STRUCTURAL AND SUPPORTING MEASURES The following non-structural and supporting measures are incorporated with the priority projects in the drainage improvement. In this