Toronto’s Wet Weather Flow Master Plan (WWFMP) is a long-term plan to protect our environment and water quality in the Lake, rivers, streams and other water bodies from the rain and melted snow (stormwater).
Toronto’s urban environment leaves little place for rain and snow to be absorbed. As a result, stormwater makes its way into the nearest creek, river or storm sewer, picking up debris, including what is on our roofs, roads, cars and sidewalks, before discharging into the nearest waterway. This includes grease, bird/animal droppings, pet waste left on sidewalks, garbage, bacteria and other pollutants.
The result can lead to degraded water quality conditions, stream bank erosion, loss of fish habitat and basement flooding.
The plan sets out 13 objectives, under four categories: