Reducing Storm Water Runoff
Storm water runoff remains the biggest threat to water quality in Minnesota streams and lakes. Half the rainfall on a natural landscape will soak into the ground and renew water resources; 40% evaporates and 10% runs off. In contrast, the paved and developed urban landscape forces over 50% of rainfall to run off, rapidly carrying pollutants into our rivers and lakes. The McColl Pond site combines several innovative features to exceed state and federal standards in storm water management.
Living Roof
The plants and growing medium on a green roof retain 70—90% of rainfall. The roof's insulation value also reduces heating and cooling needs and dampens sound.
Pervious Concrete
Any rain that seeps off the roof will land in the rain gardens surrounding the building. These beautiful gardens allow runoff to slowly filter into the earth.
Rain Gardens
Pervious concrete and pavers allow water to seep into the soil, which acts as a filter to remove pollutants.
See a full fact sheet on the McColl Pond ELC
