This document provides guidance to help dam owners, in coordination with emergency management authorities, effectively develop and exercise Emergency Action Plans (EAPs) for dams. The purpose of the guidance in this document is to meet that need.
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Published Date:02-04-2018
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EMERGENCY PREPAREDNESS PLAN FOR DAM FOR SHEP DAM IN CASE OF UNPRECEDENTED FLOODS, INCREASE IN SILT CONTENT, EARTHQUAKE, NATURAL CALAMITY ETC. ALAKHNANDA HYDRO POWER COMPANT LTD. (330MW) SRINAGAR HYDRO ELECTRIC PROJECT SRINAGAR-246174 UTTRAKHAND PREPARED BY: CHECKED BY:- Mr. SACHIN JAIN Mr. MANISH JAIN Certified Energy Manager Dy. General Manager Shift In-charge, SHEP, DAM SHEP, DAM (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM TABLE OF CONTENT Item. No. Title Page No 1.0 Introduction 4 1.1 Emergency Action Plan 5 1.2 Notification Flow Chart 6 2.0 Responsibilities 6 2.1 Responsibilities for Evacuation, Rescue & Relief 8 2.1.1 Team at Srinagar Township and adjoining area 9 2.1.2 Team for maintenance of Electrical Supply 10 2.1.3 Security team for SHEP Dam 11 2.2 Approval of the Plan 12 3.0 Emergency Procedure 12 3.1 Emergency Identification, Evacuation & 12 Classification 3.1.1 Hydrologic 13 3.1.2 Earthquake 13 3.1.3 All other events 13 3.2 Assessment of Degree of Seriousness 14 3.2.1 Definitions of Alert Levels 14 3.2.2 Alert and Warning System 14 3.3 Notification Procedure 15 3.3.1 Event Report 16 4.0 Emergency Supplies and Resources 16 4.1 Material Availability 16 4.2 Machine Equipments availability 17 4.3 Labour 17 4.4 Engineer Expert 17 4.5 Alternate Source of Power 17 5.0 Emergency management Plan for SHEP Dam in case 17 of Cloud Burst & Floods 5.1 Reservoir Operation Levels 17 5.2 Spillway Gate Operation Schedule 19 5.3 Flood Discharge and Water Level Control 20 6.0 Dam Instrumentation and Other Observations 22 7.0 Silt Content 26 (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 2 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM LIST OF ANNEXURES Sr.No Title Annexure Page No. 1 Gate Operation Schedule I 20 2 Silt Content Table II 26 3 Graph- Water Level d/s of dam axis III 27 and discharge through gates 4 Images- Dam IV 29 5 Check list for Powerhouse V 30 Shutdown 6 Contact Number of CWC Member VI 31 at Rudrapreyag Flood Control Room 7 Repair and Maintenance schedule VII 32 of upkeep different components of SHEP Dam. 8 Form-1, Form-2 & Form- 3 for VIII 33 different emergency conditions 9 Facility to made Available in Control IX 36 Room 10 Sample Warning Messages at X 37 Different Situations 11 Notification Flow Chart- XI 38 Internal/External Alert 12 Contact Number of DM, SDM, Local XII 42 Panchayat. 13 Inter Telecom number- SHEP staff XIII 43 14 Salient Features of SHEP XIV 47 15 Area Capacity Curve XV 50 16 Information Flow Chart- Internal XVI 51 17 SHEP- Plant Layout XVII 52 (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 3 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM EMERGENCY PREPAREDNESS PLAN FOR SHEP DAM 1.0 INTRODUCTION The present emergency action plan is designed for such a gigantic project which roosts prominently in the world map of large dam. The Shrinagar Hydro Electric Project, located near Shrinagar town of Tehri Garhwal and Pouri Garhwal District of Uttarakhand State, is constructed across Alaknanda river to install 4 Power Units of 82.5 MW each (Total 330MW). This is a run of the river type project with small storage. The project comprises construction of 90m high and 248m long concrete diversion dam with 8 Nos. of spillway bays. 4 Nos. of under sluices are provided in spillway block Nos. 10 & 11 for extraction of silt deposited. The main purpose of providing these under sluices in the spillway blocks is to remove the deposited silt by opening the service gates and also to deplete the reservoir in case of emergency. Two nos. concrete lined head race tunnels each of 9.8m dia. with requisite Intake structure is provided on the right bank of the dam. A reinforced cement concrete surface desilting basin with two compartments, silt extraction system is provided on the d/s of HRT/supana nalla conduit with requisite gated structure for extraction of silt deposited in silt chamber. A 3 0 5 0 m long concrete lined Power channel is located on the d/s of desilting basin to carry clean water. A concrete lined Forebay channel is provided immediately D/s of Power Channel upto Forebay Intake Structure to carry clean water to Forebay Intake Structure/ Penstock liners. A lined by-pass channel having bypass structure with gate is provided on the left bank of the Forebay channel to automatically release its excess flow into the river in case of emergency closure of power house unit to ensure safety of the power channel and Forebay channel in the moment of emergency. Forebay Intake structure with 4 Forebay vents and 4Nos. of Penstock Liners is provided at the D/s end of the Forebay channel to deliver clean water to 4 Power units. The scheme utilized for power generation ahead of around 66 m on the river Alaknanda which can be developed in the Shrinagar Valley. (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 4 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM 1.1 EMERGENCY ACTION PLAN The emergency action plan is a necessity for the size & magnitude of a project like SHEP Dam due its location in the seismically active zone and its typical geology, the potential emergency may arise out of any situation involving flood due to breach or other structural failures as well as major floods without a breach included. Other unusual situations may also arise by sudden overtopping of the dam, due to existing spillway capacity falling short despite the best efforts to route the floods. Another factor involves which may make the stability of the dam questionable i.e. unusual seepage or piping through the dam or excessive uplift pressures beneath the dam body, sliding of the side slopes, embankments, earthquake damages and land slide generated waves within the reservoirs, equipment mal functions, foundation failure, and sabotage. Any one of these factors can trigger the disaster which may disrupt normal human life in its established social traditional and economic system. The destruction of environment caused by extra ordinary natural phenomena or human created hazards results into hardship and suffering beyond redemption unless outside help is managed to the affected populace. A hazard happens to be a perceived event which threatens both life and property. A disaster is the realization of this type of hazard. It may turn out to be a disaster if proper management and mitigation measures are not ensured to alleviate the suffering of the people of the affected area. Emergency action plan in its ambit identifies potential emergency condition at a dam and specific pre planned actions to be followed to minimize property damages and loss of life. Broadly the causes responsible for such type of disasters may be classified as: · Hydrologic: such as flooding due to large releases, seepage slumping, piping, embankment cracking, embankment deformation, movement of concrete section (sliding or overturning), settlement failure of spillway gates or supporting structures, outlet works, equipment malfunctions etc. · Earthquake: This natural cause which may have impact on the structural stability of the dam resulting into embankment piping, cracking and movement of concrete section. · Other events: These include equipment failure security/criminal action, structural fire, land slide, wild fires, storm of extreme intensity, cloud burst and sabotage etc. Emergency action plan requires the project authorities to moderate or alleviate the problems at the dam. It includes procedures and information to assist the authorities in issuing early warning and notifications messages to responsible downstream. In this E.A.P. potential emergency or imminent (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 5 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM emergency arising due to hydrologic reasons as classified earlier, has been considered as most likely occurrence. 1.2 NOTIFICATION FLOW CHART N.F.C. is a very important component of the E.A.P. which may meet emergency conditions. · Failure is imminent or has occurred. · Potential emergency situation has developed or is developing. · Flood is occurring or is expected. th The SHEP Dam was commissioned and dedicated to the nation on 14 April 2015. The dam since its commissioning has been run so far by the ever vigilant administration. In the past the emergencies arising out of the situations have been managed deftly and efficiently. The uncertainty about the future requires the same vigilance and keen watch dog behavior as an emergent need of the times to come. The efforts in the past have been fruitful as the running and the maintenance of the project has been carried out according to the provisions of the codes and procedures as laid down in the operation and maintenance manuals. Despite all these good input and stringent efforts these may fall short of the likely natural aforesaid unprecedented events. In order to cope with the future emergencies and the statutory compulsions of the present time, four number alert level situation developing very slowly to situation of inevitable catastrophe are summarized as below and find mention at Annexure-XI Also four number N.F.C. covering the afore mentioned situations have been incorporated as annexure -X so as to pass on the information about the developing situation to all responsible and concerned officers. The narrative information supplementing the flow chart of different situation as above has been provided and appended at annexure-XI with detail. Sample warning messages explicitly giving a brief specific situation are also attached as annexure-X. An updated copy of the NFC is posted in all the offices of the officers having responsibility in the EAP. 2.0 RESPONSIBILITIES GVK administration is responsible for the upkeep and maintenance of SHEP Dam. The duties and responsibilities are clearly defined in respect of the different divisional engineers placed under different controls as per org. chart at Annexure-XVI. However in order to make emergency plan more effectively (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 6 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM implemented, the personnel manning the project should be aware of the responsibilities at the time of developing inevitable or imminent situations. Such situations demand that Engineer SHEP Dam & Reservoir Management and Engineer, SHEP Mech., and Engineer, SHEP Electrical will be responsible to perform pivotal role at site of emergency on the project. Above all Engineer SHEP Dam Division would be handling the situation through the active participation of the other associates being overall in charge of the SHEP Dam including all related vital structures. Engineer In charge, SHEP Dam would determine and identify the triggering events which require emergency action and ensure deputing of responsible personnel to meet such exigency. This may include incident of sabotage. In this case Engineer, SHEP Dam Division will immediately inform Project Security Officer who will act promptly as per his duties and responsibilities. The most likely situation expected to develop may be due to unprecedented high floods in Alakhnanda catchment. He will immediately inform his high offices as per flow chart of External Alert contained at Annexure-XI. He will also inform Engineer, SHEP Mech., Engineer Water Regulation and others as per N.F.C. However, under certain special circumstances the duty of informing the developing emergency or imminent emergency, the power may be delegated to Engineer Instrumentation. In an inevitable mishap all agencies/partner states to whom water is being supplied or the districts of the states through which the river Alakhnanda runs past will be informed about the exigency well in time as per N.F.C. The list of the Deputy Commissioners of the district through which the river Alakhnanda transverses its course has been appended as Annexure- XII, VI The appended N.F.C. amply explains the route and destination to where the information of the mishap is to be passed on. It may also be made imperative and followed in true sense that the flood discharging facilitation/installations are manned by the efficient and the most experienced operators and the procedures for their operation during such hours of emergency are strictly carried out in accordance with the provisions of the O & M. The brief sequence of operation of the gates at SHEP Dam may be depicted and the staff be made well aware of it. The periodic seminars or instructive training sessions may also be made part of emergency plan. This will go a long way in handling the emergency situation aptly. In an eventuality of grim flood situation such as inundation which may threaten the township or other populated areas upstream or downstream of SHEP Dam, Engineer, SHEP Dam would notify promptly to all departmental and civil authorities with the due approval of high authorities as per N.F.C. having concern with the cropping up situation. This also includes peripheral districts on the rim of the reservoir (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 7 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM (such as District Chamoli & Rudrepreyag of Uttrakhand). The list detailing the contact numbers of various villages Sarpanches and N.G.O.’s upstream and downstream of SHEP have been appended as Annexure – XII, VI. 2.1 RESPONSIBILITY FOR EVACUATION, RESCUE, RELIEF To grapple with the unprecedented situation effectively, O & M Head, SHEP Dam who is a project head would act swiftly on the basis of precise and accurate feed back information supplied by the Engineer In Charge. SHEP Dam Circle and their under associate team members and ensure minimum panic amongst his team officers and deploy the resources at his command to tide over the situation and have all the possible help by the Co-ordination Relief Committee Pauri and call help from central agencies such as I.M.D. CWC etc. will have to be informed as per N.F.C. as they have also the responsibility to discharge by issuing warning messages through various media such as audio, visual & print media etc. Above all another important action to be taken would be to get the water releases from Vishnu Preyag Power Plant into river Alakhnanda through Engineer In charge, Vishnu Preyag Project Further to cope with the developing/imminent / emergent situation such as unprecedented high floods as above, the officers under various teams would study/handle the situation promptly without any hitch or hesitation. They would be responsible to act with alacrity on identification and declaration of emergency of external alert level (Red) in consultation / approval of high officers. A siren will be sounded in the presence of Engineer In Charge Headquarter (EAP co-coordinator). The mode of sounding siren will be as follows: · In case of emergency, the duration and number of sound blasts will be 2 minutes BLOW 30 seconds BREAK for 4 times. · For all clear signals it will be continuous siren for 5 minutes which will be sounded upon the direction of Engineer In Charge, SHEP Dam after the emergency is over. It is also added that the sirens installed at SHEP Dam and in Township area would sound simultaneously at the time of declaration of the emergency. The staff operating the sirens need be made well conversant of the emergency sounding mode as described. The operation of the alarms will be checked periodically. Its proper functioning will be done and confirmed by testing annually when the EAP is reviewed every year. 2. 3. (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 8 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM In case of a grim situation getting out of control and in which case the flooding becomes inevitable, this team would arrange with all their mental resources at their command and ensure the evacuation, rescue & relief of the persons entrapped inside/outside the dam or in any surrounding area. The team with their under associates would:- 4. · Rescue and transport the casualties if any on the priority basis to first aid centre. · Transport all workers in the affected areas to the assembly point on premeditated place. · Take roll call of the persons assembled after evacuation. · The responsible persons as nominated by the Engineer In charge shall pass on the information in respect of absenteeism/missing persons to the control room at site. · Put all the efforts with the help of fire fighting staff, divers or other present personnel of security at site. · They will maintain daily diary of events and work progress & submit report in this regard to higher officers as well as to the established control room. · They may use the facilities available at each control room as per annexure IX Ensure that lists of persons in dam area working under Engineer In Charge, Engineer In Charge SHEP Mechanical and Electrical Division is readily available with them as detailed at Annexure XIII. 2.1.1 Team at Srinagar Township and adjoining area for rescue and evacuation operation In addition to above if the danger of the flood looms large on the Area downstream SHEP Dam including Srinagar Township and adjoining areas, then the under mentioned Govt Deptt team of the officers with their under associates would act on war footing. TEAM A Engineer In charge, Building Construction & Township Division 1. Engineer Estate 2. Engineer Enforcement 3. Engineer Water Supply TEAM B Engineer In charge HYDROLOGY 1. Engineer, Regulation 2. Engineer, Hydrology 3. Engineer, Meteorology (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 9 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM In case of inundation of the whole of the township etc. team A would take care of rescue and evacuation operations for an area lying on the right side of the road whereas team B would be looking after the rescue & evacuation operations left of the said road. They will be responsible for attending the rescue and evacuation operations of the entrapped persons on priority basis and provide first aid or medical aid immediately through transporting the victims/or causalities, if any to the nearby medical centre. The evacuated persons will be transported to the shelters at higher elevation. where the affected persons may be stationed with temporary housing such as tents, nearby school buildings or religious places such as Mandir & Dharamshala etc. They will contact the local NGO’s and Village sarpanches as per the list attached at Annexure - XII for having immediate help of men and material during the period of such emergency. This may also include food and clothing etc. They will also collect the information regarding the loss of human life, live stock and loss to the housing etc. They will pass this information to the control room established in the colony at safe and easily accessible pre planned place. The routine roll call of the personnel deployed for such operations shall be made invariably in assembly point. Absenteeism/missing persons will be reported to the control room and to the higher authorities also. They will also keep contact daily with the high offices for fresh instructions as well as seek their guidance if need be. They will also make efforts to keep the water supply system running if possible or otherwise make alternate arrangement for water supply to ease the hardship of the sufferers of the area. They will maintain daily diary of events and work progress and submit report in this regard to the higher officers as well as to the established control room. 2.1.2 Team for maintenance of electric supply at SHEP The team would make efforts to keep the electric supply system in the emergency running at SHEP area. They will make arrangement to provide temporary lights for such an emergency period wherever needed. The routine checkup / roll call shall be exercised on particular pre planned assembly point. The absentees or missing persons would be immediately reported to the nearest control room. (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 10 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM They will organize all support services like power, temporary lighting and operation of the water pumps. They will also keep contact daily with the high officers for fresh instructions as well as seek their guidance if need be. They will maintain daily diary of events and work progress and submit report in this regard to higher officers as well as to the established control room. 2.1.3 Security Team for SHEP Dam This security team would meet the challenge of imminent emergency or inevitable flooding situation through their efforts and try to secure the emergency operations from all angles. For this it will be more worthwhile that Project Security. Broadly they will be responsible to: · Man all projects entry points · Ensure proper access to the emergency services · Prioritize the vehicle movement to the emergency site · Control the traffic and divert through alternative routes. · Ensure no unauthorized person is entry into the emergency site. · To permit with minimum delay the entry of authorized personnel and recognized outside agencies, vehicles etc. involved in the emergency operations that come to help. · Any other responsibility as entrusted by the high officers. (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 11 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM 2.2 APPROVAL OF THE PLAN The plan should be duly approved by all the parties involved or supposed to be involved in its implementation at the time of any mishap on SHEP Dam assuming thereby that all parties involved are aware of and fully agree to the roles assigned to them during such emergency. Accordingly, the signatures of all the related parties have been appended. 3.0 EMERGENCY PROCEDURE 3.1 Emergency identification, Evaluation & Classification It is mandatory on the part of Engineer In Charge, SHEP dam to determine and identify situations that require an emergency action. Therefore establishment of procedures for timely recognition are imperative. To serve as a guide at that time following emergency identification, evaluation & classification procedure elements are detailed below: Listing of the conditions or events which could lead to or indicate an existing or potential emergency. Situations involving flood emergencies due to a breach or other structural failure as well as a major flood without a breach should be included. Unusual situations such as those caused:- (a) By overtopping of a dam due to insufficient spillway capacity during large inflows to the reservoir (b) By seepage or piping through the dam over long internal conduits (c) Slope embankment slides (d) Earthquake damage & (e) Landslide generated waves within the reservoir. Hydraulics, hydrodynamics, hydrology, sediment transport Mechanics and geo- technical aspects are all involved in breach formation and eventual dam failure. The prominent causes can be listed as follows: III. Extreme storm JJJ. Landslide KKK. Earthquake LLL. Overtopping MMM. Structural damage NNN. Piping OOO. Equipment malfunction PPP. Foundation failure QQQ. Sabotage 3.1.1 Hydrologic: These are related to flooding due to large releases, seepage, slumping, piping, embankment, deformation, embankment overtopping, movement of concrete section cracking, (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 12 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM embankment (sliding or over turning) settlement, failure of spillway gates or supporting structures. spillway & outlet works releases, equipment malfunction, etc. 3.1.2 Earthquake: These are related to impact of earthquake at dam which could lead to embankment piping, embankment cracking, embankment deformation, liquefaction and movement of concrete section, etc. 3.1.3 All other events: These are related to hazardous material spills/ releases, equipment failures, security / criminal actions, fish / wildlife impacts, wildfires, structural fires, landslides, extreme storm, sabotage, etc. One or more of the above unusual situations will initiate declaration of an emergency for internal alert or external alert. A brief description of the means by which potential emergencies will be identified, including the data & information collection system, monitoring arrangements, surveillance, inspection procedures and other provisions for early detection of conditions indicating an existing or potential emergency. Emergency events occur with unusual situations varying degrees of severity and predictability. An emergency may develop gradually and be steadily monitored providing ample response time. Conversely, an emergency may develop suddenly requiring immediate emergency response to prevent devastating loss of life or impacts to structures or the environment. The following definitions are used to classify emergency events according to an ascending and progressive order of severity to which the dam downstream or off-site population, structures or environment are threatened. Condition may dictate that situation is classified as imminent without passing through the less severe situations. A smooth transition should occur, if the situation is classified as “developing” prior to “imminent”. Table: Causes of failures Cause of failure Cause of failure Foundation problems 40 % Inadequate spillway 23 % Poor construction 12 % Uneven settlement 10 % High pore pressure 5 % Acts of war 3 % Embankment slips 2 % Defective materials 2 % Incorrect operations 2 % Earthquakes 1 % (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 13 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM The problem of dam break could be summarized as in Figure. Dam break Breach Levee Structure Failure Flank Failure Failure Dry Bed Wet bottom Surface Submerging Non Submerging Small Breach Medium Breach Large Breach Complete Removal 3.2 ASSESMENT of DEGREE of SERIOUSNESS of unusual situation is required. It may be classified as the BLUE LEVEL, YELLOW LEVEL, ORANGE LEVEL and RED LEVEL alert according to their seriousness. Guidelines lie mainly in the interface between the internal and external emergency planning, being the two main aspects of the following: 3.2.1 Definition of alert levels: If an incident happen with the dam or problem arises related with the dam over its foundations or with landslides into the reservoir, earthquakes, adverse meteorological situations or any other alert must be given to civil protection system. The gravity of the problem may obviously vary with the situation, but in order to assure that all the entities involved in emergency actions are behaving in accordance with the situation, the alert levels need to be previously defined, and must be the same for the internal and external emergency plan of each dam. These alert levels are established in colors, from Blue, the lowest level that corresponds to a routine or normal situation, to Red, corresponding to a serious or catastrophic situation. The alert levels defined are presented in Annex-XI. Its underlying philosophy relates the gravity of dam problems with the expected impacts in the downstream valley and the likelihood of the total dam rupture. (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 14 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM 3.2.2 Alert and Warning systems: When facing problematic situation, the entity exploring the dam must judge the corresponding alert level and notify the civil protection system, in order to allow the development of the necessary actions, according to the situation. If the dam rupture is very likely (orange alert level) or imminent (red level) give” external alert” signal and the entity exploring the dam must warn population downstream of the dam. In orange level, the warning indicates people to be ready for evacuation and in red alert to evacuate quickly. · Given that a dam rupture can be very sudden, it is assumed that people leaving up to a certain distance downstream of the dam have to evacuate by their own means, with no time to wait for civil protection help. · Procedures, aids, instructions and provisions for interpreting information and data to assess the severity and magnitude of any existing or potential emergency should be clearly defined. The table covering different emergency situations demanding entirely separate approach to tackle each case is given as per Annexure-XI. 1. 3.3 NOTIFICATION PROCEDURES A list of all the persons which includes their name & position, office & home telephones and who are to be notified in the event of any emergency including alternatives is required to be attached in Emergency Action Plan. The same has been placed at Annexure- XII. The list indicating who is to make call to whom & in what priority has been attached as Annexure XIII. Engineer In Charge has been assigned the duty of spokesperson to disseminate information. The use of media should be pre planned to the extent possible. Given below is an example of news releases that would be most effective for each possible emergency situation. The information which should be conveyed during notification can be given in the following prescript message (for use by designee when making notification). i) This is (name, title, agency)_____________ monitoring, SHEP Dam ii) The date is ________and time is________ . iii) The conditions at Dam are___________ iv) We will notify you if the conditions at the Reservoir change. We will give you the next briefing at _______ hours or sooner. (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 15 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM v) For further information contact at SHEP control room telephone No.________ or _________. vi) This message will be sent to you in the text form of fax or other. 3.3.1 EVENT REPORT · The in-charge shall ensure that the following report forms are to be used when recording various emergency situations and unusual occurrences. · The news media including Radio, Television and newspapers should be utilized to the extent available & appropriate. · Emergency Event/unusual occurrence Report for reporting emergency events and unusual occurrences other than earthquakes, bomb threats and oil and hazardous spills. Form – 1. · Earthquake Damage Report – for reporting earthquakes – Form -2. · Bomb threat Report – for reporting bomb threats – Form-3. These forms have been attached as Annexure- VIII. · In addition all persons involved including their names title & phone numbers and all agencies notified should be documented separately during such mishap. It is desirable for all officers receiving reports in respect of tackling situations and duties assigned to record / maintain diary and messages be recorded if possible. Photographs are also essential to provide complete documentation of the event. The attendance at site should be 24 hours a day during occurrence of such emergencies. 4.0 EMERGENCY SUPPLIES AND RESOURCES There are certain planning and organizational measures that can help Dam personnel and local officials to manage emergency situations more safely and effectively. These include: 4.1 MATERIAL AVAILABILITY Material needed for emergency repair may be stock piled at a nearby convenient safe place from where it can be used whenever there is emergent need for small quantum emergency jobs. For major emergency need bulk supply sources be beforehand identified and their timely supply has to be ensured by Engineer In Charge, SHEP Dam Division. Material such as earth or sand gunny bag be kept ready in near vicinity of the dam for their immediate use. (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 16 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM 4.2 MACHINERY EQUIPMENT AVAILABILITY The different types of machinery required for carrying out different activities during course of reconstruction has been stationed permanently at to meet with any emergency along with operators. 4.3 LABOUR The Labour required during the execution of the work will have to be arranged locally. Engineer In Charge, SHEP Dam will make all such arrangements in shortest possible time. 4.4 ENGINEERS EXPERTS During any emergency Engineer In Charge SHEP Dam will contact /call or request the engineers/persons having expertise in the field. These persons may prove helpful for better guidance to tackle/handle the situation promptly & properly. 4.5 PROVIDING ALTERNATIVE SOURCES OF POWER In the event of power failure during the crucial hours of emergency at site when different activities are running simultaneously, it is very much imperative to have an alternative source of power to meet with such situation so that execution may be carried out smoothly without any hindrance. For restoring power supply to the radial gates (in the event of failure of existing arrangement of power supply, the controls be immediately connected to the feeder from the D.G. Bank. 5.0 EMERGENCY MANAGEMENT PLAN FOR SHEP DAM IN CASE OF CLOUD BURST AND FLOODS 5.1 RESERVOIR OPERATION LEVELS The project is planned as a run of the river type scheme. The upper level of the reservoir is governed by the expected tail waters of the proposed Utyasu dam on the upstream side and accordingly FRL has been fixed as 605.5m. The minimum draw down level (MDDL) has been kept as el.603m and this level provides live poundage of about 8.0 million cubic meters. (Ref. Area capacity curve of the reservoir at Annexure- XV). The live poundage of 8 Mcum would be sufficient for peaking operation of the station for about four hours daily. Inflow in excess of the reservoir storage capacity and hydraulic capacity of the generating plant and environmental release requirements is discharged through the spillway bays and under sluice openings. Eight numbers of spillway gates and four number of under sluice openings will manage the excess inflow. The outflow discharge arrangements and corresponding reservoir levels are discussed (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 17 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM below: · The water conductor system for power generation has been designed to pass a discharge up to 616 cumec and is connected to the reservoir through an intake structure about 100m upstream of the dam axis. The reservoir shall be operated between FRL and MDDL during the lean period for optimal use of the reservoir for power generation at the project, environmental releases and power generation downstream. During this period, the Power Station can be operated as RoR at FRL or for peaking between FRL and MDDL on a daily basis. After peaking operation between FRL and MDDL, the reservoir level shall be restored to FRL at the end of the day. · Design flood for design of the spillway discharge capacity has been computed as 19200 cumec and corresponds to the SPF. The Probable Maximum Flood (PMF) has been computed as 26400 cumec. The spillway consists of 8 bays each of 14.5m width and can pass the SPF at FRL and PMF at MWL. This has been confirmed in the hydraulic model studies conducted at IRI Roorkee. · Four numbers of Under sluices have been constructed in two dam blocks at elevation el.558m and has a maximum discharge capacity of 875 cumec at FRL. · Water release at the rate of 5 cumec has also been envisaged for meeting the environmental requirements. · During the lean period of the year, the reservoir shall be operated between FRL & MDDL, for power generation. (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 18 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM 5.2 SPILLWAY GATE OPERATION SCHEDULE The objective of the gate operation schedule is to ensure safety of the dam structure including the gate parts, hoists, energy dissipation arrangement and spillway tail channel while letting out the excess discharge. Shrinagar Hydroelectric Project is located on the river Alaknanda, is envisaged as a run-of-the-river scheme with a comparatively small storage capacity. The reservoir is formed by the construction of a 90m high diversion dam with spillway crest level at 584.5m. The reservoir will be operated between full reservoir level (FRL) of 605.5m and Minimum Draw down Level (MDDL) of 603m. This provides a live storage of 8Mcum between FRL and MDDL. For PMF condition, the reservoir level will rise to Maximum Water Level (MWL) of 609.8m with all the outlet gates fully open. The reservoir is operated between FRL and MDDL and ensures optimal use of the reservoir for power generation at the project. In a dependable year, between 1 July and 10 September, the reservoir will be operated at or above FRL, depending on the magnitude of the inflow. Inflow in excess of the reservoir storage capacity and hydraulic capacity of the generating plant will be discharged through the spillway bays and under sluice openings. Eight numbers of spillway bays and four number of under sluice openings will manage the excess inflow. In order to meet the power generation requirements, the annual drawdown of the reservoir begins by 21 September, when the inflows into the reservoir decline as a result of receding monsoon. From 21 September till May, the volume of water flowing down the penstock to the powerhouse typically exceeds the inflows into the reservoir and therefore during this period, water will be drawn from the live storage for operation of the power station for peaking purpose. The small live storage available in the reservoir can be used to meet the peaking requirements of the power station and the reservoir can be restored to FRL using the inflow during this period. Thus, during this period, the reservoir will be operated between FRL and MDDL for operation of the power station. st From 1 June, inflow will meet the power station operation on full load. The project authorities have installed reservoir water level measuring instruments which data will be used to forecast the instantaneous inflows into the reservoir for the purpose of maximising power generation and ensuring timely refill of the reservoir. The instantaneous water level data is transmitted into a computer in the control room and converted into inflow data with the help of reservoir capacity data and instantaneous outflow data. The reservoir is drawn down during the period 21 September to 31 May on a daily basis for peaking power generation and filled back at the end of the day. During this (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 19 (330MW) ALAKHNANDA HYDRO POWER CO. LTD EMERGENCY ACTION PLAN FOR DAM Period the inflow is less than the power generation requirement and thus, the reservoir is operated between FRL and MDDL. 5.3 Flood discharge and water level control To start with the gate opening sequence for the automatic control system is proposed to be as follows: Sequence of operation of the 8 gates is given below (gate numbering progresses from the left i.e.1 denotes the left end gate and 8 denotes the rightmost end gate). Two middle gates (nos.4&5) shall be opened symmetrically first, to prevent cross flows striking the river banks. At any time during the operation of the, the difference in gate opening of any two consecutive operation shall not exceed 0.5m. After opening the two central gates, the next two gates, (3&6) adjacent to the central gates on both sides, shall be opened in symmetrical manner. The other gates (2&7) and (1&8) then shall be opened symmetrically. While closing the gates, the gates that were opened last shall be closed first. The procedure to be followed for closing the gates shall be generally reverse of the procedure followed for opening the gates. Complete closure of the gates shall be accomplished by gradual lowering of the gates by 0.2 to 0.3m in the proper sequence. Detailed spillway gate operation schedule for range of inflows has been computed and shown in detail in tabular form in Annexure I. The table shows inflow rate and sequence of operation of the HRT intake gates, under-sluice gates and the spillway gates. The control values in terms of inflow, reservoir level and the range of operation of the spillway gates is extracted as shown in Table-I below (330 MW) SRINAGAR HYDRO ELECTRIC PROJECT 20