Quick explanation
- Rainwater is collected from the roof of each home.
- Preliminary filtration removes large debris (like leaves).
- Rainwater enters the main storage tank via an inlet calmer.
- Sedimentation allows sediment to settle on the base of the tank.
- Rainwater is pumped from the tank via a floating suction hose.
- Rainwater is transported to multiple header tanks throughout the development.
- Rainwater is boosted to each home for non-potable use.
Detailed explanation
Transportation
Rainwater is collected from the roof area of each home and transported via separate pipework. Separate pipework will prevent the cross-contamination of the roof water and surface water runoff.
Roof rainwater and surface water runoff are always kept separate as only roof rainwater will be reused. Surface water contains additional contaminants which are not suitable for reuse in most instances.
Roof rainwater is transported to a central location on the development.
Pre-Filtration
Leaves and undissolved particles are separated before the main storage tank via a pre-tank filter. Pre-tank filters trap any debris above 1mm on a mesh surface, allowing clear rainwater to flow into the tank.
Stormsaver pre-tank filters are designed to be fully removable from ground level for maintenance purposes. Stormsaver Systems integrates the pre-tank filter within a separate chamber in the main storage tank for ease of installation.
Storage
After preliminary filtration, rainwater enters the main storage tank via a calmed inlet.
The calmed inlet prevents the disturbance of fine sediment in the base of the storage tank. Rainwater Harvesting tanks are designed to naturally overflow (around three times per year if not reused) to prevent stagnation.
Submersible pumps sit within the storage tank and draw water from the cleanest part of the storage tank via a floating suction filter.
Rainwater tanks can also be connected to attenuation capacity via Active Attenuation. Learn more here.
Additional filtration
Best practice specifications will include an optional third stage of filtration to protect the system against smaller debris. Stormsaver provides Automatic Backwash Filtration to achieve a self-cleaning solution for third-stage filtration. Learn more here.
Secondary storage
Rainwater is boosted from a central storage tank to smaller header tanks around the development. The number of header tanks is determined by the location and number of homes served by the rainwater harvesting system.
Mains water top up
An intelligent mains water top up is achieved in the header tank via a WRAS-compliant air gap.
Stormsaver Systems are supplied with mains water protection in the form of a mechanical shut off valve. This vital feature protects against waste in the event of a solenoid valve failure.