Short Answer
Yes. Rainwater is captured from the roof through a filter, stored in a tank, and pumped through the irrigation system on demand. It is naturally soft and free of chlorine, making it better for plants, and because drip operates at low pressure, a rainwater tank with a pump is ideal for drip zones. A mains top-up keeps the tank topped up when rainwater runs low.
How rainwater irrigation works
Rainwater is captured from the roof through a filter that removes leaves and debris, stored in an underground or above-ground tank, and pumped through the irrigation system on demand.
Why rainwater is better for plants
Rainwater is naturally soft and free of chlorine, making it better for acid-loving plants, seedlings and ericaceous planting. Because drip irrigation operates at low pressure, rainwater from a tank with a pump is ideal for drip zones.
Mains top-up and continuity
A mains top-up kit keeps the tank topped up automatically when rainwater runs low, so irrigation never stops.
Cost savings and hosepipe bans
For Surrey gardens on metered mains, a rainwater system can cut irrigation water costs while keeping the garden green through hosepipe bans, because stored rainwater is not subject to restrictions.
Key Takeaway
Rainwater is an excellent match for irrigation — naturally soft, chlorine-free, and ideal for drip zones, with a mains top-up ensuring supply continues even in dry spells.
Frequently Asked Questions
Can I run drip irrigation from a rainwater tank?
Yes. Drip operates at low pressure, so a submersible pump in a rainwater tank is ideal. We fit a filter to protect the drip emitters from any sediment.
Is rainwater better for plants than tap water?
Yes. Rainwater is naturally soft and free of chlorine, making it better for acid-loving plants, seedlings and ericaceous planting.
How large should a rainwater tank be for irrigation?
A typical garden needs a tank of 2,500–5,000 litres; a large estate may need 10,000 litres or more, depending on roof area, rainfall and planting.
Can rainwater run an entire irrigation system?
Yes, if the tank is large enough and the pump is sized correctly. We calculate tank size from roof area, local rainfall and irrigation demand to ensure supply through dry periods.