SUPADIVERTA can fill a larger settling tank from the same pipe that fills a smaller tank . . . but fill the smaller tank last!
Priority filling a large settling tank away from the house allows a smaller tank sited at the house to receive cleaner water. The height of the smaller tank can vary.
SUPADIVERTA does this by raising water in a vertical riser supplied by the Supadiverta reservoir to a level higher than the water in the reservoir! Read on...
One or more SUPADIVERTAS are height adjusted on the downpipes to prevent tank B from filling higher than the bottom of its overflow outlet. Tank B fills through a bottom inlet and the overflow pipe is not needed. . . . read more
Tank A is filled by a small vertical riser and requires an overflow pipe.
A plain tee fitted to the horizontal pipe near tank A reduces to a 15mm (18.3mm ID) vertical riser.
The centre of the horizontal pipe at the top of the riser is plumbed level with the top of the SUPADIVERTA reservoir wall and diverts water to the tank’s top meshed inlet.
Tank B supplies Tank A with decanted water when needed via a reducing tee that is fitted to the larger horizontal pipe and connected to a 25mm gate or ball valve on tank A.
A DIY sediment trap can be also easily fitted to a non turbulent section of horizontal pipe. . . . see photos
HOW DOES SUPADIVERTA RAISE THE WATER LEVEL IN THE VERTICAL RISER?
Regular weir flow down a 20mm (23.7mm ID) PVC drop is restricted to approximately 6 litres per minute due to a vortex generating a swirling air core. Syphonic full flow generates substantially higher flow rates and velocities.
When rainfall exceeds the ability of an outlet to drain with regular weir flow but is insufficient to maintain full syphonic flow, the outlet alternates between the two mediums. This occurs regularly and the constant vacuum breaks draw air into the pipe. The air is quickly purged to the horizontal pipe when the outlet again goes syphonic.
The tee and the vertical riser fitted next to tank A also serves as an air vent. The rising air bubbles in the vertical riser have less mass than the volume of water they displace, resulting in a lower atmospheric pressure inside the pipe. Reducing the riser to 15mm increases the percentage volume of air in the pipe and the lower atmospheric pressure causes the water level to rise.
This is the basis of air lift pumps but whereas air lift pumps need an air compressor, SUPADIVERTA supplies the air during transition flow. Altering the height of the riser alters the onset and rate of flow.
Water will divert to tank A during heavier rain or once tank B becomes full.
Linked below are excellent videos explaining and demonstrating how air lift pumps work.