Heavy rains test Sherwood Park's stormwater system
Up to 86mm of rain flooded roads and triggered sewer backups across Strathcona County last week.
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Heavy rains drenched Strathcona County last week, leaving parts of Sherwood Park wading through water that residents measured in inches.
Environment and Climate Change Canada recorded 73 millimetres of rainfall in Sherwood Park between June 1 and 7. Other parts of the county saw up to 86 millimetres, contributing to localized flooding and sewer backups.
Residents tracking the weather reported localized rainfall levels of up to eight inches in some areas. The elevated water levels provided a challenge for local stormwater management facilities, prompting county staff to closely monitor conditions throughout the storms.
Strathcona County's on-call crews responded to multiple private properties experiencing sewer backups. Pooling water was reported on some roadways. In rural areas, roadside ditches filled with water.
County officials said temporary ponding on streets is common during intense rain events — water takes time to enter storm drains and move through the system. Ditches are designed to collect and temporarily store runoff away from roads and properties until water levels gradually recede.
During significant rainfall, Strathcona County's stormwater system is designed to temporarily store water and slowly release it over time. Neighbourhood stormwater management facilities — wet ponds, dry ponds, and wetlands — collect and manage rainfall and runoff. Dry ponds can quickly fill with water during major storms.
Permanent signs have been installed at some facilities to remind residents that higher water levels are normal during heavy precipitation.
The county is encouraging homeowners to reduce flood risk: direct downspouts at least 1.5 metres from foundation walls, ensure drainage swales remain clear, check that sump pumps work properly, and make sure rain barrel overflows are directed away from homes. Residents should also inspect weeping tile flappers and conserve water during heavy rainfall to reduce pressure on the sewer system.
Anyone experiencing a sewer backup can contact Strathcona County's 24-hour line at 780-467-7785.