Having a reliable water supply has been a priority for some time.  Our existing shallow well fills with water that has a high iron content, and which is not great to drink, even when filtered. We do have a mains supply, but have no control over the chemical content, and it is metered. Also it could be vulnerable in the event of a more widespread power failure.

We do have an abundance of roof area however, and so rainwater harvesting would provide an ample supply.

Notes – survey – where to put the store, how big to make the store. Commercial systems seem to be in the order of 3000 – 10,000 litres and tanks are expensive. Examine water consumption to predict necessary storage.
Available resources? – IBC tanks, 22mm water pipe,

Location – lower than the house.

Use – to irrigate the polytunnels. Drinking.

Considerations – distribution – not enough head for gravity feed – 0.1 bar / metre height, total fall is max 3m.

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