Meeting - Authority - Toronto and Region Conservation Authority

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RATIONALEThe G. Ross Lord Dam Operations, Maintenance and Surveillance Manual and EmergencyPreparedness Plan was updated for the following reasons:1. The original operations procedures for G. Ross Lord Dam were completed in 1973 whenthe dam was built. The land use of the watershed upstream of the dam has undergonesignificant changes since that time. As such, the original operations procedure for the damneeded to be evaluated to determine if it was still applicable given the land use changesand changes in hydrology upstream of the dam.2. Since the dam was constructed in 1973, technology and new tools have become availablethat needed to be incorporated to ensure the dam is properly inspected and maintained toa high standard.3. The Draft Ontario Dam Safety Guidelines, prepared by the Ontario Ministry of NaturalResources (MNR), require that Emergency Preparedness Plans be prepared for large damsto ensure that appropriate actions were taken in the event an emergency was to occur atthe dam.DETAILS OF WORK COMPLETEDTRCA retained the IBI Group to prepare the Operations, Maintenance and Surveillance Manualand Emergency Preparedness Plan for G. Ross Lord Dam. Through IBI’s technical analysis, itwas determined that the original operations procedure was still valid. However, the existingoperations procedure was slightly modified to pro-rate gate openings when the rate-of-rise ofthe reservoir exceeds the operational threshold. Under the original operations procedure gateswere opened in the same increment, even if the rate of rise in the reservoir exceeded theoperational threshold. The pro-rating of gate openings was necessary to ensure that theHurricane Hazel flood could be safely passed through the dam.It should also be noted that the updated operations procedure formally recognizes that TRCA'sChief Flood Duty Officers have some flexibility to exercise engineering judgement with respectto gate operations when weather forecasts and downstream conditions allow for it. Thisincludes the ability to draw down the dam to normal water levels to ensure the maximumamount of flood control storage is available in anticipation of a storm event.The updated maintenance and surveillance program for G. Ross Lord Dam includes a series ofupdated inspection checklists to be used by TRCA staff. These checklists itemize eachcomponent of the dam (i.e. electrical, mechanical, structural) and describe what actions andfrequency of inspections are required to be carried out by TRCA staff to ensure the dam isproperly maintained.Lastly, the updated Emergency Preparedness Plan provides updated direction to TRCA staff onhow to deal with emergencies that may arise at the dam and to safeguard the public within thedam's potential inundation area. This is achieved through effective dam surveillance, promptnotification to the City of Toronto's Office of Emergency Management (OEM) and citizenwarning and evacuation when required.32
FINANCIAL DETAILSThe update to the G. Ross Lord Dam Operations, Maintenance and Surveillance Manual andEmergency Preparedness Plan was funded by the Ontario Ministry of Natural Resources Waterand Erosion Control Infrastructure (WECI) fund with matching funding from the City of Torontoand the Region of York.Report prepared by: Sameer Dhalla, extension 5350Emails: sdhalla@trca.on.caFor Information contact: Sameer Dhalla, extension 5350Emails: sdhalla@trca.on.caDate: April 08, 2009Attachments: 133
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Page 5 and 6: 10.8 ENBRIDGE GAS DISTRIBUTION INC.
Page 7 and 8: 10.20 MAUGHAN ESTATESTo construct,
Page 9 and 10: 10.31 117 WATERSIDE CRESCENTTo cons
Page 11 and 12: 10.38 REGIONAL MUNICIPALITY OF YORK
Page 13 and 14: 10.43 MONARCH CORPORATIONTo constru
Page 15 and 16: CITY OF VAUGHAN10.54 BLOCK 11 PROPE
Page 17 and 18: PERMIT APPLICATIONS 10.64 - 10.68 A
Page 19 and 20: PERMIT APPLICATIONS 10.69 - 10.80 A
Page 21 and 22: CFN: 42053 - Application #: 0082/09
Page 23 and 24: 10.83 POWERSTREAM INC.To construct,
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Page 27 and 28: TO: Chair and Members of the Author
Page 29 and 30: Studies show that implementing LID
Page 31: TO: Chair and Members of the Author
Page 37 and 38: FINANCIAL DETAILSThere are no TRCA
Page 39 and 40: PenaltyAny person or persons found
Page 41 and 42: • Communicate with others and alw
Page 43 and 44: (c) the owner did not exercise reas
Page 45 and 46: 2) Major OccurrencesMajor occurrenc
Page 47 and 48: Step 3 - Community InputTRCA will p
Page 49 and 50: Rules for Off-Leash AreasWhile a do
Page 51 and 52: • Bio-diesel Equipment - Purchase
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Meeting - Authority - Toronto and Region Conservation Authority

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