Maintenance to Rochdale Retention Pond
The City of Regina lowered the Rochdale Retention Pond to evaluate the cause of the July 28, 2020 sinkhole located beside the pathway behind the Northwest Leisure Centre. Further investigation is required to determine the full extent of the damage and therefore the pond will continue to be lowered and possibly completely drained.
The hole along the pathway will remain backfilled and barricades will be kept in place for public safety. Residents are asked to avoid the work area. Further work is required now to reduce the risk of the hole becoming more unstable.
Starting on Tuesday, August 25 crews will continue to pump the retention pond water to bring down the level at a slow and controlled rate into a storm manhole that is located near Rochdale Boulevard. Pumps will be running during the day. It is expected to take several weeks to bring the pond level down. Lowering the pond level during the hot summer temperatures may cause odour around the pond. If the pond is completely drained, wildlife on the lake will re-locate. Regulatory agencies are aware and supportive of the planned approach.
If the pond needs to be drained, City crews will evaluate if dredging is required. Dredging would take place in the winter months and helps to removes algae that can eventually reduce the amount of oxygen in the water and aquatic life. If the Rochdale Retention Pond is drained, it would remain empty until the dredging is complete and it would naturally fill with rain and snowmelt in spring. The City will advise residents if dredging will occur.
Retention ponds are meant to collect and store rainfall and runoff from the streets and adjacent land. They allow the sediment to settle at the bottom of the pond which will improve the water quality of the runoff exiting the pond. They also minimize the risk of flooding or damage to properties in the area.