Installing a soakwell is an essential step in managing stormwater effectively, preventing erosion, and protecting property foundations. A soakwell is an underground chamber that collects and gradually disperses excess water into the surrounding soil.
This guide provides a step-by-step explanation of the installation process, ensuring that your system functions efficiently. For more technical details, you can refer to a Wikipedia reference on stormwater management systems.
Tools And Materials Needed
Before starting the installation, gather the necessary tools and materials to ensure a smooth process.
Tools Required
- Shovel and Spade: This is used to dig the soakwell pit and trenches.
- Measuring Tape: To take accurate dimensions of the pit and pipe connections.
- Spirit Level: To check the slope and proper alignment of pipes.
- Wheelbarrow: For transporting soil and gravel.
- Compacting Tool or Plate Compactor: To create a stable base for the soakwell.
- Drill (if needed): For making inlet holes in certain types of soakwells.
- Saw or Pipe Cutter: To cut PVC pipes to the required length.
- Safety Gear: Gloves, safety glasses, and sturdy footwear for protection.
Materials Required
- Soakwell Unit: Choose either concrete or plastic, depending on load requirements.
- PVC Pipes and Fittings: These are used to connect downpipes to the soakwell.
- Gravel or Crushed Rock: To improve drainage around the soakwell.
- Geotextile Fabric: To prevent soil from clogging the system.
- PVC Cement and Sealant: For securing pipe joints.
- Soil or Sand: For backfilling and levelling after installation.
Step-By-Step Guide To Installing A Soakwell
1. Selecting The Right Location
- Choose a spot that allows efficient drainage away from buildings and boundaries.
- Ensure compliance with local regulations regarding setback distances.
- The location should be easily accessible for maintenance.
2. Digging The Pit
- Mark the Area: Use a measuring tape and markers to outline the soakwell’s placement.
- Excavate the Pit: Dig a hole slightly larger than the soakwell unit. A standard 1,000-litre soakwell requires a pit approximately:
- 1.2 metres wide
- 1.4 metres deep
- Trench for Pipes: Dig a trench leading from the downpipe to the soakwell, ensuring a gentle slope of at least 1:100 for water flow.
3. Preparing The Base
- Add Gravel Layer: Spread a 100-millimetre layer of gravel or crushed rock at the bottom.
- Level the Surface: Use a spirit level to ensure even distribution.
- Compact the Base: Use a compacting tool to create a stable foundation.
4. Installing The Soakwell
- Lower the Unit: Carefully place the soakwell into the prepared pit.
- Position It Correctly: Ensure the inlet hole aligns with the trench where the pipe will be installed.
- Wrap in Geotextile Fabric: This prevents soil from entering and clogging the soakwell.
5. Connecting The Pipes
- Measure and Cut Pipes: Ensure they fit between the downpipe and soakwell.
- Create a Slope: Maintain a minimum slope of 1:100 for proper drainage.
- Attach the Pipes: Use PVC cement and fittings to securely connect pipes to the soakwell’s inlet.
- Seal the Connections: Apply a waterproof sealant to prevent leaks.
6. Backfilling The Pit
- Surround the Soakwell with Gravel: Fill the area around the soakwell with gravel up to 100 millimetres below the surface.
- Compact the Fill: Lightly compact the gravel to provide stability.
- Add Soil or Sand: Use the remaining soil to fill the last 100 millimetres and level the surface with the surrounding ground.
7. Testing The System
- Pour Water Into the Downpipe: Check if the water flows smoothly into the soakwell.
- Observe for Leaks: Inspect all pipe connections to ensure there are no leaks.
- Check Drainage Efficiency: The soakwell should disperse water efficiently without overflowing.
Final Checks And Maintenance Tips
- Regular Inspection: Check the soakwell after heavy rain to ensure proper functioning.
- Clean Gutters and Downpipes: Prevent blockages by clearing leaves and debris.
- Monitor Soil Settlement: Refill any sunken areas around the soakwell with additional soil.
- Unclog Inlet Pipes: If water is not flowing correctly, clear any debris from the inlet pipes.
- Check for Overflow Issues: If water is not draining efficiently, consider installing an additional soakwell or increasing capacity.
Conclusion
Installing a soakwell is a practical solution for effective stormwater management, reducing water pooling and soil erosion while protecting property foundations. By following the correct installation process, using appropriate materials, and conducting regular maintenance, you can ensure long-term efficiency. A well-installed soak well not only prevents drainage issues but also contributes to a sustainable water management system.
Frequently Asked Questions
How Long Does It Take To Install A Soakwell?
The installation process can take anywhere from a few hours to a full day, depending on factors such as soil conditions, pit depth, and the number of soakwells required. Professional installations may be faster due to access to specialised equipment.
Do I Need Council Approval To Install A Soakwell?
Regulations vary depending on your location. It is advisable to check with your local council before installation, as some areas have specific requirements for stormwater drainage systems and setback distances.
How Often Should A Soakwell Be Maintained?
Soakwells require minimal maintenance, but it is recommended to inspect them annually, especially after heavy rainfall. Regularly cleaning gutters and downpipes helps prevent blockages and ensures efficient drainage.