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Flood Warning UPDATE

Web posted on January 12, 2020

The Grand River Conservation Authority is issuing the following Flood Warning message for the entire Grand River watershed. This message replaces Flood Message #3.

The weather system that brought up to 100mm of rainfall to the Grand River watershed on Saturday has now moved out of the province and temperatures have returned below freezing. This event produced the highest January rainfall on record for this part of the province and resulted in substantial flooding in a number of communities in the northern and central portions of the watershed. River flows are beginning to recede in these areas. Flows in the southern Grand River watershed, south of Cambridge, will continue to increase through the weekend and result in significant flooding in some areas before receding early next week. 

Northern Grand River Watershed

The northern Grand River watershed received between 65-95mm of rainfall with limited freezing rain. Communities of Drayton and Grand Valley experienced flows similar to those seen during the June 2017 flood event. River flows are expected to continue to recede in these communities through early next week but will be higher than normal for this time of year.

Central Grand River Watershed

The central Grand River watershed, including West Montrose, St. Jacobs, New Hamburg, Ayr and Cambridge received between 80-100mm of rainfall and no freezing rain. Flows in the Grand River through West Montrose and Conestogo River through St. Jacobs will continue to recede through the weekend however will remain much higher than normal for this time of year. GRCA reservoirs upstream of these communities were used to substantially reduce downstream flooding and will begin releasing water to return them to their normal operating levels for this time of year.

The Nith River peaked on Sunday morning through New Hamburg in Flood Warning Zone 3 and will continue to recede through early next week.  

Grand River & Speed River (Cambridge)

Flows in the Grand River and Speed River through Cambridge peaked on Sunday morning and will begin to recede through the day but remain elevated through much of next week. Cambridge Flood Coordinators are asked to maintain closures of Black Bridge Road and Highway 24 south of Concession Street and continue to monitor conditions.

Nith River (Ayr)

Flows in the Nith River through Ayr are expected to peak in Flood Warning Zone 3 around midnight Sunday in the 370 cm/s range. North Dumfries Flood Coordinators have been requested to notify residents in affected areas and continue to monitor conditions. 

Nith River (Wolverton)

Flows in the Nith River through Wolverton are expected to be similar to those experienced during February 2018, peaking around 370 cm/s early Monday morning. Oxford County Flood Coordinators have been requested to notify those residents affected during the February 2018 flood event.

Southern Grand River Watershed

Communities along the Grand River through the southern watershed including Paris, Brantford, Caledonia, Cayuga, and Dunnville received between 40-80mm of rainfall during this event and should prepare for flooding similar to levels experienced in June 2017. 

Grand River (Glen Morris)

Flows in the Grand River through Glen Morris are expected to peak in the 725 cm/s range mid-afternoon Sunday. County of Brant Flood Coordinators are requested to notify residents in the area of Dawson Road who experienced flooding in June 2017 and continue to monitor conditions.

Grand River (Paris)

Flows in the Grand River through Paris are expected to peak in the 725 cm/s range mid-afternoon Sunday. Residents in this community should expect conditions similar to those experienced during the June 2017 flood event.

Grand River (Brantford)

Flows in the Grand River through Brantford are expected to peak in the 950 cm/s range through the evening on Sunday. Flows will be similar to those experienced during the June 2017 flood event. Brantford Flood Coordinators are requested to maintain closure of Gilkison Street and monitor conditions along the dike reach.

Grand River (Brant County/Six Nations)

Flows in the Grand River through Brant County and Six Nations are expected to peak in the 950 cm/s range overnight Sunday. Flows will be similar to those experienced during the June 2017 flood event. Brant County and Six Nations Flood Coordinators are requested to prepare to close Bateman Line & 4th Line (Boundary Road) and monitor conditions in this area.

Grand River (Caledonia)

Flows in the Grand River through Caledonia are expected to peak in the 1150 cm/s range on Monday morning. Flows are expected to exceed those experienced during the June 2017 flood event. Haldimand County Flood Coordinators are requested to closely monitor conditions near the old arena and fairgrounds and take necessary precautions.

Grand River (Cayuga)

Flows in the Grand River through Cayuga are expected to peak in the 1270 cm/s range around midnight on Monday. Flows are expected to exceed those experienced during the June 2017 flood event. Haldimand County Flood Coordinators are requested to prepare for the closure of River Drive, Sims Lock Road, Grand Sports Drive as well as notify Conway Park and monitor conditions.

Grand River (Dunnville)

Flows in the Grand River through Cayuga are expected to peak in the 1280 cm/s range on Tuesday morning. Flows are expected to exceed those experienced during the June 2017 flood event. Haldimand County Flood Coordinators are requested to notify residents along the east bank of the Grand River on Main Street, upstream of Dunnville dam.

Entire Grand River Watershed

GRCA's major reservoirs at Belwood, Conestogo, Guelph, Luther, Woolwich, Laurel, and Shade's Mills were used to manage runoff from this event and reduce flooding downstream of these reservoirs. Water is now being released from these reservoirs, returning them to their normal operating levels for this time of year. River flows throughout the watershed will remain high through next week while runoff from this weather event moves through the system. 

Stay Safe

The public is asked to stay away from all waterways due to the extreme risk at this time. Banks adjacent to rivers and creeks are very slippery and, when combined with current weather conditions, pose a serious hazard. Parents are encouraged to keep their children and pets away from all watercourses.

This message will be updated by 3:00 p.m. on Monday January 13, 2020.  Updated flood messages will be issued as necessary. 

 

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