It demonstrates how to harvest rainwater from a roof and store it in a tank for non-potable domestic use, thereby reducing
mains water demand. The pump in the storage tank sends rainwater directly to the point of use e.g. toilet flushing, garden
watering etc. If the stored rainwater runs out, mains water is automatically brought to the system to meet the demand.
The photo above shows the set-up we have installed in the warehouse. Water enters the rainwater storage tank via downpipe
and calmed inlet. To simulate this process mains water could be gravity fed from a header tank (not included). Water from the
storage tank can be pumped up to feed, for example, one or two WC’s.
The control system provided with the automated rainwater harvesting kit enables:
The automated system utilises a float switch and solenoid valve; the float switch detects when the rainwater storage tank is empty
and opens the electrically-actuated solenoid valve so that mains water flows into the bottom of the tank. When the float switch
floats off the bottom of the tank it turns the solenoid valve off. The bulk of the storage tank remains empty ready to admit the
water from the next ‘rain shower’.
- Supply to automatically switch between harvested and mains supply.
- Pump to be switched on and off with demand
The Automated Rainwater Harvesting Kit comprises four basic elements: