Public Disclosure Authorized Volume 1 OPERATION, MA1FNTENANCE AM) SAFETY MANUAL FOR THE hI14GAT DAM Public Disclosure Authorized Public Disclosure Authorized Magat River Integrated Irrigation System Cauayan City, Isabela Public Disclosure Authorized November 2007 Republi ka ng Pilipinas . , DEI'ARTMENT OF AGKICU1,TUIe Pambansang Pangasiwaan ng Patubig L-., ;. (NATIONALIRRIGA'I'ION ADMINISTI~'~ION) buGAT RIVER INTEGRATED IHRIGATION SYSTEM [\' -.,a L>IS'I'R[Cl' -..,. - I-IMIN.~~1. CAI IASAN Cln' 3305 October 3 1.2007 FOR : The Administrator This Agency THRU : The Deputy Administrator FROM : The Acting Opcrations Mnnagcr This System SUBJECT : OPERATION. MAINTENANCE AND SAFETY MANUAL FOR THE MAGAT DAM We have the honor to submit tile updated Operation, Maintenance and Safety Manual for thc Magat Dam for your approval and refercncc. The Manual was prcpsrcd by n MARIIS Committee thc nlernbership of which was drawn'from the different Divisions of MARIlS bascd on the 1985 Manual prepared by NIA and the 1992 Flood Operation Rule jointly prcparcd by NIA, NPC and PAG-ASA in coordination with the SN ABOITIZ Technical Staff. CONFORMED: EMMANUE,~v RUB~O CEO, SYAP Recommending Approval: APPROVED: &b#f@uJ MARCEL V. T JGAOEN, JR. Ph.D NlA DeputJ. Administrator NIA ~dmynistrator OPERATION, MAINTENANCE AND SAFETY MANUAL FOR THE MAGAT DAM The members of the Technical Working Group (TWG) of both NIA-MARIIS and SN ABOlTlZ Inc. hereby propose the immediate adoption of this updated Manual in the operation and maintenance of the Magat High Dam and its appurtenant structures and facilities with the recommendation that whenever there are new policies, guidelines and/or technologies that need to be adopted, same must be incorporated into the Manual. NIA-MARIIS TWG MEMBERS A VICTORINO T. ARON Member 1''Member 4' i / I' '4' FLO 0 C. BANIQUED JR. Co-chairman L PORFIRIO V. REYES STIG 0.AKSDAL TABLE OF CONTENTS PREFACE MAGAT CONTINGENCY PLAN L GENERAL lL OBJECTIVE 111. CONCEPT 1 IV. ACTION PLAN FOR EMERGENCY RELEASE OF WATER 2 3 W. COORDINATING INSTRUCTION 4 WL ADMINISTRATION AND LOGISTICS 5 WIL APPENDICES Error! Bookmark not defined. CHAPTER l INTRODUCTION 1.1 GENERAL 1.2 PURPOSE, FORMAT AND SCOPE OF MANUAL 1.3 IMPORTANT OPERATING PRECAUTIONS DISTRIBUTION AND CUSTODY OF THE MANUAL. REVISION AND AMENDMENTS SUPPORTING DOCUMENTS REFERENCE MATERIALS CHAPTER 2 2.1 MARUS AND THE DRD (DRD) 2.2.1 OPERATIONS MANAGER MARIIS 2.2.2 MANAGER, DRD 2.2.3 CWIL WORKS SECTION 2.2.4 ELECTRICAWMECKANICAL SECTION 2.2.5 INSTRUMENTATION AND FLOOD FORECASTING AND WARNING SECTION 2.2.6 WATERSHED MANAGEMENT SECTION 2.3 OTHER AUTHORITIES 25 a. EMERGENCHY ACTION PLANG,TYPHOONS AND FLOOD FORECAST, AND DISASTER RELIEF 25 b. POWER GENERATION AND TRANSMlSSlON 25 c. WA TERSHED AND RESERVOIR 25 d. ACCESS ROADS AND fllGHII'A YS 25 2.4 REPORTING PROCEDURES 26 2.4.1 REGULAR MONTHLY OPERATIONS AND MAINTENANCE REPORTS 26 2.4.2 INSTRUMENTATION AND DAM SAFETY REPORT 26 2.4.3 UNUSUAL OCCURRENCE OR EMERGENCY REPORTS. 26 2.5 POLICIES AND GUIDELINES 26 CHAPTER 3 29 GENERAL PROJECT AND SYSTEM INFORMATION 29 3.1 PURPOSE OF TEE PROJECT 29 3.2 THE MAGAT AND BALIGATAN DAM S 3.2.1 GENERAL 3.2.2 WATERSHED 3.2.3 RESERVOIR 3.2.3.1 The Magat Reservoir after 22 years of operation 3.2.4 EMBANKMENTS 3.2.5 GROUT CURTrUN 3.2.6 EMBANKMENTICONCRETE INTERFACES 3.2.7 SPILLWAY HEADWORKS a. OGEE BAYS b. ORIRCERAYS c. GATE CONTROL HOUSE d. SANDBY GEMGW TOR HOUSE e. SPILLHAYBRIDGE 3.2.8 SPILLWAY a. CHUTE b. FWP BUCKET c. PLUNGE POOL AND OUTLET C~YIYNEL 3.2.9 HEADWORKS POWER LNTAKE 3.2.10 APPROACH CHANNEL 3.2.1 1 GALLERIES AND ACCESS POINTS a. HE4 D WORKS b. FOUNDATION 3.2.12 DRAINAGE 3.2.13 DIVERSION TUNNELS AND LOW LEVEL OUTLET GATES 3.2.14 MAGAT-BALIGATAN CONNECTION CHANNEL a. .YOML POWER SUPPLY b. EMEXGENCYPOWERSLIPPLY a. INTERIOR b. OUTDOOR 3.2.19 COMMUNICATIONS 3.3 MARIS DIVERSION DAM 45 3.4 BALIGATAN DIVERSION DAM CHAPTER 4 RESERVOIR OPERATION 4.1 NORMAL OPERATION 4.1.1 RESERVOIR OPERATING RULE CURVE 4.1.2 NORMAL IRRIGATION AND POWER RELEASES 4.1.3 SPlLLW AY RELEASES FOR IRRlGATlON 4.2 FLOOD OPERA'IION 4.2.1. Flood Forecasting and Warning System (a) Monitoring of hydro-meteorological data and weather conditions (b) Prediction of raid31 and inflow (c) Dccision to ooperase the spillway for pre-release (d) Preparation of the Pre-release Plan (e) Warning on Prerelease (f) Adjustment of Discharge (g) Resumption of Dischargmg 4.2.2. Spillway Operation a. Operation Criteria b. Principles Of Flood Passing Operations c. Opening of Spillway Gates d. Closing Spillway Gates 4.2.3 EMERGENCY RELEASES 4.2.4 DEBRlS M RESERVOIR CHAPTER 5 OPERATION AND MAINTENANCE OF EQUIPMENT 5.1 SPILLWAY 5.1.1 OGEE SPILLWAY RADIAL GATES 5.1.2 ORIFICE SPILLWAY RADIAL GATES 5.1.3 OPERATION a. OGEE SPILL WA Y R4 DL4 L G4 TE OPERA TlNG INSIR UCTIOh!5' h. ORIFICE SPII,L WA Y R4DIA I, DATE OPERATING INXJZIJCTIONS c. STANDBY STA TIONARY PO WER GENERA TOR UNIT OPERATING INSTRUCTIONS 5.1.4 PERSONNEL 5.1.4 COMMUNICATION 5.1.5 EMERGENCY POWER 5.1.6 MAINTENANCE a. OGEE SPILL WA Y GATES (b) ORIFICE SPILL RA I' GA TES c. ROUTINE MINTENA NCE d. INSPECTION AFIER EARTHQUAKE c. SCHEDULES 5.2 TBE POWER INTAKES 5.2.1 TRASH RACKS 5.22 CLOSURE GATE 5.2.3 INSTRUMENTS OPERATION FILLING THE PENSTOCK INDICA TIONAT PO WERHOUSE POWER INTAKE CLOSURE GA TE OPERA TING INSTR UClI ONS MAINTENANCE BULKHEAD GATE DEU!4 TERING LIFTING OF CLOSURE GATE TO THE UAINTEN4 NCE CHAhfBER REFILLING OF TIIE PEitrST0CK ROUTINE UAIiVI I.V.4\'CE I,YSPECTIOA.'AFTFTE EARTHQUAKE SCHEU ULES 5.3 HEADWORKS GANTRY CRANE 5.4 LOW LEVEL OUTLET GATES - DIVERSION TUNNEL 1 5.4.1 GENERAL 5.4.2 OPERATION AND ABANDONMENT 5.4.3 ACCESS TO GATE CFIAMBER 5.4.4 SAFETY 5.4.5 LIGHTING AND POWER 5.4.6 MAINTENANCE 5.5 BALIGATAN OUTLET WORKS 5.5.1 GENERAL 5.5.1 DESCRIPTION 5.5.3 OPERATIONS a. PREPARA TI0hr 6. CONDUCT FILLJNG c. NORMIL OPERATIONS - STILUNG BASINRELE4SES d. FLOOD PROTECTION e. EMERGENCY OPERA TlONS f: TANDm4 HIGH PRESSUW G4 TE OPER4 TION NSTliUfflONS 5.5.4 MAINTENANCE a. INTAKE BULKHEAD 6. EMPTYING THE CONDUITS c REFILJNG THE CONDUIT d. NORMAL ImENANCE e. INSPECTIONAFTER E4R THQ LMKE f SC'HED UI,E 5.6. MARIS DIVERSION DAM 5.6.1. GENERAL 5.6.2. OPERATIONS 5.6.3. STOP LOGS 5.7. BALIGATAN DIVERSION DAM 5.7.1 CANAL INTAKE GATES 5.7.2 RADIAL GATE 5.7.3 OPERATION AND MAINTENANCE 5.8 INSPECTION AND TRIAL OPERATION SCHEDULES FOR EQUIPMENT 5.9 MAJOR EQUIPMENT SUPPLIERS NAMES AND ADDRESSES CHAPTER 6 INSTRUMENTATION 6.1 GENERAL 6.2 TYPES AND PURPOSES OF MAGAT INSTRUMENTATION 6.2.1 TYPES OF INSTRUMENTS INSTALLED 6.2.2 PURPOSES OF INSTRUMENTS a. PIEZOMETERS b. SOIL PRESSURE CELLS c. T0Rl"ORPDOINCLINOMETER CASING (TIC) d. EYTENSOAETEPS e. DOUBLE FLUID SET7'LE4dEAVTDEUCE3 (DFSD) J IM/ER TED PL UMBLINES g. SURFACE SETTLEMENT AND DEFLECl'ION hiEASWiENTS h. STRONG M0mNA CCELEROGRAPHSAND PEAK A CCELERATION RECORDERS i. FLOW A4EASUREMEhT DEL7CES 6.3 INSTRUMENTATION BY PROJECT FEATURE 6.3.1 EMBANKMENTS 6.3.2 CONCRETE HEAD WORKS STRUCTURE 6.3.3 SPILLWAY CHUTE AND FLIP BUCKET 6.3.4 FOUNDATION AND DR4INAGE GALLERIES 6.4 INSTRUMENTATION DATA COLLECTION, REDUCTION AND PRESENTATION 6.4.1 GENERAL 6.4.2 COLLECTION FREQUENCY 6.4.3 DATA COLLECTION AND REDUCTlON a. SAFETY OF PERSONNEl, b. PIEZOMETERS c. SOIL PRESSURE CELLS d. TORPEDO INCWAObiEER CASINGS e. EkTENSOMETIiXS f: DOUBLE FLUID SEi'TLEhENT DEWCES g. IMERTED PL UkfBLINES h. SUIU.4CE SEi'7"NTAND DEFLECTION MEASUREMENTS I. S7RONG MOTION ACCELEROGRAPHS AND PFAK ACCELER4 TION RECORDERS j. FLOW h4IL4SUIEkIEN7' WIERS k. FLOWS FROM GALLERY DRA IN HOLES I. LO WANGLE SHE4R ZOA'E MEASUWZhfENTSAND CA LCULA TIOIVS ~n. SURWYELEVATIOhrS 6.4.4 DATA PRESENTATION a. SUMMARY FORMS b. GRAPHICAL PRESEhTA TZUN 6.5 INSTRUMENTATION DATA ANALYSIS AND TNTERPRETATION 6.5.1 GENERAL 6.5.2 ANALYSIS AND INTERPRETATION BY INSTRUMENTATION TYPE a. PIEZOhfETERS b. SOIL PRESSURE CELLS C. TORPEDO INCLINOAdEER CY SINGS d. EUENSOMETER DA T4 e. DFSD Loops 1: Inwrledplumblines g. Surface settlement and deflection measurements h. flow measurement devices i. Low angle shear zone instrumentation 6.6 INSTRUMENTATION REPORTS 6.61 MONTLY REPORTS a. Completed summa9 forms b. Completedgraphicalpresentationforms c. Instrumentation analysis and interpretation 6.6.2 Annual report CHAPTER 7 124 INSPECTION AND MAINTENANCE OF STRUCTURES 124 7.1 GENERAL 7.1.1 PLRi'oSE 7.1.2 SCOPE 7.2 DAM SAFETY EVALUATIONS 7.2.1 PRINCIPLES AND CONCEPTS 7.2.2 FREQUENCY OF EVALUATIONS 7.2.3 DAM SAFEREVALUATION PROCEDURES a. PRE-INSPECTION PROCED WS 6. FIELD INSPECTION PROCEDUKES C. REPORTS AND FOLLOW-UP ACTIONS 7.2.4 SAFETY EVALUATION TEAM 7.3 NORMAL INSPECTIONS AND MAINTENANCE OF STRUCTURES 127 7.3.1 SAFETY OF PERSONNEL 127 7.3.2 WARNING SIGNS OF POTENTIAL DANGER TO DAM SAFETY 127 a. EMBANKMENTS 127 h. SONRt5T .Y7RUCTURES 128 7.3 3 EMBANKMENTS 128 a. SElTLEhiEA4T/DISPL4CEn.ENT 128 6. SEEPAGWLEAKAGE 129 c. SLOPES AND C'AMINTENANCE 129 7.3.4 CUTSLOPES 130 7.3.5 CONCRETE STRUCTURES 130 7.3.6 MAGAT SPILLWAY. SPILLWAY CHUTE. FLIP BUCKETS AND SPILLWAY APPROACH CHANNEL 132 7.3.7 PLUNGE POOL AND OUTLET CHANNEL 133 7.3.8 POWER WAKES 134 7.3.9 DIVERSION TUNNELS 134 7.3.10 BALIGATAN OUTLET WORKS 134 7.3.11 FOUMlATIONS AND FOUNDATION DRAINAGE 135 7.3.12 MARIS DIVERSION DAM 135 7.3.13 RESERVOIR AREA 136 a.