Introduction

When it comes to designing a drainage system for a segmental retaining wall (SRW), one of the most important decisions to make is which type of perforated pipe to use. While there are a few different options available, one of the best choices for SRW drainage is an all-around perforated pipe.

Advantages of an All-Around Perforated Pipe for SRW Drainage

Efficient Drainage

One of the main advantages of an all-around perforated pipe* is that it allows for more efficient drainage. Unlike a pipe with only two slots, an all-around perforated pipe allows water to enter from multiple points along the pipe, which helps to distribute the water more evenly and reduces the chances of clogging. This is especially important for SRWs, which are often used to hold back large amounts of soil and must be able to handle heavy rainfall and other sources of water.

Preventing Hydrostatic Pressure

Another advantage of an all-around perforated pipe is that it can help to prevent water from pooling and exerting hydrostatic pressure on the wall. When water is able to enter the pipe from multiple points along its length, it is less likely to build up and create pressure against the wall. This can help to prolong the life of the SRW and reduce the risk of damage.

Choosing the Right Pipe Material and Size

When considering an all-around perforated pipe, it is important to use a durable and long-lasting material such as PVC or HDPE. These types of pipes are resistant to corrosion and can withstand the elements, ensuring that they will last for many years. Additionally, a pipe with a 4-inch diameter will provide sufficient capacity for water drainage. The pipe should also be sloped at a minimum of one percent* along its length* to ensure proper drainage.

Why All-Around Perforated Pipes are Better than Two-Slot Pipes

In contrast, a pipe with only two slots has a more limited area for water to enter and could become clogged more easily. Additionally, the two-slot perforated pipe does not provide the same level of protection against hydrostatic pressure and could be more prone to failure in extreme conditions.

Proper Installation is Key

It’s important to note that the proper installation of the all-around perforated pipe is crucial to ensure efficient drainage. It should be installed at the correct slope* to ensure that the water flows out of the pipe at the desired location, and a filter fabric* or drainage aggregate should be installed around the pipe to prevent soil from clogging the perforations.

Conclusion

In conclusion, when designing a drainage system for a segmental retaining wall, an all-around perforated pipe* is the best choice. It allows for more efficient drainage, distributes water more evenly, and helps to prevent water from pooling and exerting hydrostatic pressure on the wall. By using a PVC or HDPE pipe with 4-inch diameter and with a slope of at least one percent* along its length*, you can ensure that your SRW’s drainage system is durable, long-lasting and efficient. Consult with a professional engineer to ensure the correct sizing and installation of the pipe for the specific SRW application.

*Amazon Affiliate – If you use these links and make a purchase, I may be compensated.