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Optimize Wall Drainage (Beyond Draintiles)

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At 2:31 in

How to Build a Retaining Wall and 6 Reasons they Fail

What happens here

A properly constructed retaining wall should allow water to pass through evenly, meaning water should ideally never reach the drain tile system. Drain tiles, typically 4-inch perforated pipes, are meant to serve as emergency overflows, not the primary means of drainage. If water is consistently seen percolating through a drain tile opening, it indicates a failure in the overall wall system, suggesting that the drainage aggregate behind the wall is clogged or 'bound up,' preventing even water passage. This condition can lead to immense pressure buildup and eventual wall failure.

Goal: Achieve uniform water passage through the retaining wall structure

Tools and materials

  • 4-inch Perforated Drain Tile — Acts as an emergency overflow in a retaining wall, but consistent flow indicates failure

What they say

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another typical problem with retaining walls. People rely on the drain tile to actually function. The wall behind me, it looks okay, but it's actually in a state of failure. The first sign that it's in a state of failure is if you look at the base of the wall, you can actually see where the drain tile opening has water percolating through. That means that the water in this entire retaining wall is concentrated into that drain tile system. That's just a 4in perforated drain tile. It's not meant to handle large amounts of water. It's meant to only act as an emergency overflow at best. The entire retaining wall should allow water to pass through evenly. Meaning the water in the behind the retaining wall should never get down to the drain tile system. If you see water pumping through a drain tile opening, that means that entire wall is in a state of failure. All of the drainage aggregate is bound up. It's not allowing the water to pass through and eventually this wall is going to pop like a balloon. Behind me is a small

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