Retaining walls play an important role in sloping landscapes and creating stable outdoor spaces. However, when water comes into the equation, even the strongest retaining walls can buckle. When exposed to excess groundwater, it can result in the walls developing cracks, bows, and, in the most severe cases, complete wall failure. With so much at stake, the importance of proper AGI pipe drainage cannot be underestimated. In this guide, we’ll take a look at why AGI pipes are so important, the risks of insufficient drainage, and how the right drainage solution can protect your walls and other constructions for years to come.
What are AGI Pipes?
AGI Pipes, short for Agricultural Pipes, are flexible and perforated plastic pipes and conduits used in landscaping, civil engineering, and agriculture. Their primary purpose is to collect and divert excess ground and surface water away from the relevant site.
You can find different types of AGI pipes in the market. The most common are slotted (perforated) pipes that have tiny slits that allow the water to enter into the pipes. You can also find unslotted pipes that transport water without letting it seep into the surrounding soil. Socked AGI pipes are the slotted pipes that are wrapped in a permeable ‘geofabric’ filter sock. The sock stops soil and mud from clogging the pipe.
How Can Water Damage Retaining Walls?
Water is the primary contributor to retaining wall failure, contributing to the failure in a number of ways. They include the following:
- Hydrostatic pressure – When the water accumulates behind the soil in a retaining wall, it can significantly increase the pressure and density of the soil. This creates hydrostatic pressure (outward force) that pushes against the rear of the wall. This pressure can cause the walls to bulge, lean, crack, and eventually collapse.
- Soil erosion and washout – Water can wash away fine soil particles and erode the earth at the base of the wall. When the soil supporting the base erodes, the structural integrity of the entire wall is compromised.
- Freeze-thaw damage – In colder climates, water that is trapped in porous materials of retaining walls or saturated soil can freeze and expand. The expansion can cause cracks or flake off over time.
How AGI Pipes Protect Retaining Walls
AGI pipes protect retaining walls by stopping the accumulation of water in the soil behind the retaining walls. When the water is collected and safely removed, it eliminates hydrostatic pressure and soil erosion.
How to Choose the Right AGI Pipes for Your Project
When it comes to choosing the right AGI pipes for your project, here are the points you need to consider:
- Slotted vs Unslotted – Slotted pipes allow water to seep in from the surrounding soil, while unslotted pipes are designed to transport water from one point to another without allowing any water to escape or enter. Slotted pipes are perfect for gardens, while unslotted pipes are great for driveways and patios.
- Socked vs Sockless – AGI pipes with filter socks are highly recommended for residential and agricultural projects. The sock acts as a barrier and keeps fine silt, clay and sand from entering the pipe and causing blockages over time. Sockless pipes are best used in clean, coarse, or rocky soils where there is no significant concern of sediment build-up.
- Correct size – When the pipes are too large or small, the lack of proper connections can significantly reduce the overall functionality of the system.
- Material and durability – HDPE pipes are highly flexible, making them ideal for navigating bends and obstacles. On the other hand, PVC pipes are more heavy-duty, making them an excellent choice for heavy-duty and civil constructions.
Conclusion
If you want to make sure that your retaining walls stay strong for years to come, then you need to make sure that they have effective drainage systems. Without proper water management, pressure builds up, foundations erode, and ultimately the walls collapse. That is why having the right AGI pipes can make a huge difference in any residential, landscaping, or large-scale civil construction project.
As a builder, contractor, or homeowner, if you’re looking for the best construction material for your project, get in touch with Convic Australia today. Since 2001, we’ve been providing high-quality civil construction materials designed for multiple industries, designed for Australian conditions. Make your project a success with materials from a source you can trust.