Gathering Your Materials and Tools
Connecting a water butt to your downpipe is a straightforward process that can significantly reduce your reliance on mains water for garden irrigation. The core principle involves intercepting rainwater as it flows down your downpipe and diverting it into your water butt. This requires a few key components, primarily a diverter kit, and some basic tools.
A water butt diverter kit is the most common and efficient solution. These kits typically include a section of pipe that attaches to your existing downpipe, featuring a smaller outlet that connects via a flexible hose to the inlet on your water butt. You'll need to select a diverter kit compatible with your downpipe's diameter (common sizes are 68mm and 80mm for uPVC, or 65mm and 75mm for metal) and ensure it has the correct outlet size for your water butt's inlet. Some kits also incorporate a filter to prevent leaves and debris from entering the butt.
Beyond the diverter kit, you will need the water butt itself, preferably with a pre-drilled inlet hole. A spirit level is useful for ensuring the butt is positioned correctly. You'll also need a drill with appropriate drill bits (often a hole saw for the water butt inlet and a masonry bit if you need to drill into brickwork for support), a hacksaw or pipe cutter to trim the downpipe, a pencil or marker for measurements, a tape measure, and possibly a screwdriver or wrench depending on the diverter kit's fixings. Safety glasses and gloves are advisable for eye and hand protection.
Choosing the Right Water Butt Location
Before you begin cutting or drilling, selecting the optimal location for your water butt is crucial. The ground beneath the water butt must be firm, level, and stable. Water is heavy, and a full butt can weigh hundreds of kilograms. Placing it directly on the soil can lead to it sinking or tipping. Consider using a purpose-built stand or laying paving slabs to create a solid base. This also raises the butt, improving water pressure from the tap and making it easier to fill watering cans.
Positioning is also dictated by the downpipe you intend to connect to. Ideally, choose a downpipe that runs close to a garden area you frequently water, or near a tap if you plan to use a pump. Ensure there is sufficient space for the water butt, the diverter kit, and any associated hosing. It's also worth noting that some diverter kits require a minimum height difference between the diverter outlet and the water butt's maximum water level to function effectively, so check the manufacturer's instructions.
The stability of the water butt's base is paramount for safety and longevity.
Methods for Connecting Your Water Butt
What is the best way to connect a water butt to a downpipe? Several methods exist, but the most common and recommended approach involves a diverter kit. This system is designed to seamlessly integrate with your existing guttering system, minimising the risk of leaks and maximising water capture efficiency.
Using a Downpipe Diverter Kit
The process typically starts by measuring and marking the downpipe at the desired height for the diverter. This height should align with the water butt's inlet and allow for adequate fall in the connecting hose. Once marked, use a hacksaw or pipe cutter to carefully cut out a section of the downpipe. The diverter unit will then slot into this gap, usually secured with screws or clips provided in the kit. Follow the manufacturer's instructions precisely, as different diverter designs may have specific installation requirements.
Next, connect the flexible hose from the diverter's outlet to the water butt's inlet. Ensure the connection is secure to prevent water loss. If your water butt doesn't have a pre-drilled inlet, you'll need to create one using a hole saw of the appropriate size. For overflow management, most water butt systems have an overflow outlet near the top. This should be directed away from the building's foundations, ideally towards a drain, soakaway, or another water butt.
Alternatives and Considerations
While diverter kits are standard, in some situations, a more manual approach might be considered, though less recommended for long-term use. This could involve temporarily removing a section of downpipe and fitting a bespoke connector or a section of wider pipe to channel water into the butt. However, these methods are prone to leaks and are less resilient to weather changes.
For those concerned about water quality, many diverter kits include a leaf filter. This sits within the diverter or the connecting hose, catching debris before it enters the water butt. Regularly cleaning this filter is vital for maintaining water flow and preventing blockages. If your water butt has a tap, ensure it's positioned high enough to allow most of the collected water to be accessed.
Install an overflow hose directing excess water away from your property's foundations, especially during heavy rainfall.
When connecting multiple water butts, you can link them together in sequence using connecting kits. The overflow from the first butt then feeds into the second, and so on. This allows you to maximise your rainwater storage capacity.
The most critical step is ensuring all connections are watertight.
Troubleshooting Common Issues
How do you fix a water butt connected to a downpipe that isn't working correctly? Several common issues can arise during and after installation, but most are resolvable with a little attention to detail.
Leaks and Blockages
Leaks are perhaps the most frequent problem. These usually occur at the connection points: where the diverter joins the downpipe, where the hose connects to the water butt, or at the water butt's tap. For downpipe leaks, check that the diverter is seated correctly and that any seals or rubber gaskets are in place and not damaged. Ensure any screws or fixings are tightened appropriately without overtightening, which can crack plastic parts. Hose connections should be secured with jubilee clips if provided, or by ensuring a snug fit. If the water butt tap is leaking, it might need tightening or replacement of its washer.
Blockages are often caused by leaves and debris, especially if a filter isn't present or isn't maintained. Regularly inspect and clean the diverter's filter and the connecting hose. If the water butt becomes completely blocked, you may need to disconnect the hose and flush out the system. Ensure downpipes themselves are also clear of obstructions before connecting the water butt.
Water Flow and Overflow Management
If water isn't flowing into the butt, first check for blockages. If clear, verify the height difference. The diverter outlet needs to be higher than the water butt's inlet, and the connecting hose should have a consistent downward slope towards the butt. If the water butt is overflowing frequently, even when not completely full, it might indicate the diverter is installed too low relative to the butt's inlet, or that the outlet diameter of the diverter is too small for the volume of water entering it during heavy rain. In such cases, consider repositioning the diverter higher or ensuring the overflow outlet is adequate and clear.
Regular maintenance, including filter cleaning, prevents most flow issues.
Another potential issue is the water butt not filling sufficiently. This could be due to insufficient rainfall, a leak, or a partially blocked diverter. If you experience prolonged dry spells, your water butt will naturally not fill. In these instances, if a hosepipe ban is in effect, you may need to consider alternative methods for watering, such as using a watering can filled from a tap or a stored supply.
Consider the long-term implications of water butt placement. While convenient, a water butt situated under a particularly debris-rich tree might require more frequent cleaning. If connecting to a downpipe that runs close to a wall, ensure the water butt is positioned far enough away to allow for maintenance access and to prevent dampness against the building structure.
Maximising Your Rainwater Harvest
Once your water butt is correctly connected to the downpipe, the focus shifts to optimising its performance and integrating rainwater harvesting into your broader garden care strategy. This goes beyond a simple connection and involves understanding how to best utilise the collected resource.
Watering Your Garden Effectively
The water collected in a water butt is ideal for watering plants, especially those that prefer soft water, like acid-loving plants such as rhododendrons and blueberries. Use the water butt tap to fill watering cans, or connect a pump to a hose for larger areas. Using rainwater reduces the demand on treated mains water, which is beneficial for the environment and can lower your water bills. For very large gardens or more complex needs, a more extensive garden irrigation system might be considered, but for most domestic needs, a water butt is an excellent starting point.
Consider the type of watering. Watering the base of plants is generally more efficient than overhead watering, as it reduces evaporation and the risk of fungal diseases. If you're using a garden hose, ensure it's kept in good condition and use appropriate hosepipe connectors. If you're concerned about water pressure or flow rate, a water butt stand can make a significant difference, as can linking multiple butts together.
Expanding Your System
If one water butt isn't enough, you can expand your system by linking additional butts together. Most water butts come with a connection kit or have pre-drilled holes for this purpose. The overflow from the first butt then feeds into the second, and so on. This allows you to store a much larger volume of water, ensuring you have a supply even during drier periods. When linking butts, ensure they are all on a stable, level base and that the connecting hoses are not kinked.
For those looking for more advanced rainwater harvesting solutions, such as supplying water to an entire house or garden irrigation system, more complex installations involving underground tanks and filtration systems are available. However, for simple garden use, connecting a water butt to a downpipe is an accessible and highly effective method.
Use a watering can with a rose attachment for gentle, even watering of delicate plants.
Remember that rainwater harvesting can be particularly valuable during hosepipe ban periods. By having a sufficient water butt capacity, you can continue to tend to your garden without relying on mains water, ensuring your plants thrive.
The environmental benefits of using rainwater are substantial, reducing strain on water resources.