A blue roof is a roof that is designed to retain rainfall. This is typically done to conserve resources, reduce costs and improve quality of life. The following are common types of blue roof.
Active SystemsSystems that use power to store and use water collected from the roof such as a water tank and pump system.
Passive SystemsSystems that make use of water without electrical components, typically using gravity.
Stormwater HarvestingCollecting water for use in the building or its grounds. For example, using rainwater from the roof in toilets.
CoolingUsing water to cool a building. These are often passive systems that use a combination of water and materials on a roof as insulation in a hot climate or season.
Solar Water HeatingIt is possible to use solar energy to heat rainwater that can then be used in a swimming pool. This can allow a heated swimming pool to use zero water or energy from the grid.Reducing rainwater runoff with a rooftop garden designed to absorb and filter water. This can help to prevent flooding and pollution.
IrrigationStoring rainwater and using it later to irrigate a garden on the roof or elsewhere in the building.
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