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GRCA Watershed update

Web posted on January 12, 2020

The GRCA is issuing a High Lake Erie Level Flood Warning Message. The Watershed Conditions Statement for Lake Erie remains in effect.

Environment Canada has issued a Wind Warning for Lake Erie, warning of strong south-west winds, gusting up to 100 km/h, overnight Saturday and into Sunday morning, beginning to ease near noon. A rainfall warning is also in effect with rain, heavy at times, continuing overnight. Total rainfall amounts of 40 to 60 mm or more are possible by early Sunday morning.

The MNRF's surge model forecast for the eastern end of Lake Erie is indicating a rise in levels of 2.10 metres (6.9 feet) above chart datum of 173.5 m IGLD85 at the gauge in Port Colborne. The peak above critical level is forecast to occur Sunday morning between approximately 7:00 a.m. and 11:00 a.m. 

The MNRF forecast is predicting the following in the vicinity of Port Maitland: 

Lake Erie current elevation at Port Maitland:  174.60 m (IGLD 1985)

Lake Erie estimated to peak at:                   175.60 m (IGLD 1985), excluding waves

Lake Erie Expected time of peak:                      Thursday, October 31 (late night)

Critical Level:                                                            175.5 m (IGLD 1985)

Forecast (estimated) Peak Lake Level:      0.10 m above the critical level, excluding waves

Area of Impact:                                                    Zone 1 flood zone along Lake Erie Shoreline

While some uncertainty remains in the height of the Lake Erie surge, forecasts indicate a risk for flooding along the Lake Erie shoreline and Grand River downstream of Dunnville Dam. Waves of up to 1.6 m are expected to accompany this surge event.

The Haldimand County Flood Coordinator is requested to warn affected residents and businesses within Lake Erie Flood Zone 1, along the Grand River downstream of Dunnville Dam, in the village of Port Maitland and along the lakeshore.

Haldimand County OPP and municipal staff are requested to monitor roads along the lakeshore and implement closures as necessary.

The public is asked to stay away from the Lake Erie shoreline due to strong wave action and elevated water levels. Parents are reminded to keep children and pets away from these areas. This message is in effect until 4:00 pm on Sunday, January 12, 2020 and will be updated as needed.


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