> I have finally installed a rain water tank

Ah, the web has been all a-buzz with rumours about when it would
be done ;-)

> Anyone have any clever solutions or know a good source of low
> pressure smallish solenoid valves (in Perth Western Australia).

Hydroponic valves ? I've some here, about 30mm diameter, 24V,
that connect to 6mm tubing. Not sure of the possible max flow rate
but it sounds like it would be "reasonable" for your application

Or small fish tank/pond pumps. The ViaAqua ones I use for a pond
can shift a lot of water for as little as NZ$20

http://www.commodityaxis.com/ProductDisplay.aspx?id=7

8000 model -> 1000 gallons / hour (75 litres / min) to 10ft (3m)
480 model -> 100 gallons / hour (7.5 litres / min) to 2ft (600mm)

You can find them or like them at garden suppliers, pet shops,
hardware outlets etc

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