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A French drain is simply a small trench, dug to a gradient, and filled with aggregate, that will allow surface water to drain away from your walls, a building, driveway, garden or area that is prone to surface water pooling, or is vulnerable to flash flooding. French Drain detail showing a cross section showing the graded stones

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Learn how to install a French drain to direct runoff water out of your yard. Perforated pipe and gravel let water drain naturally. It'll help prevent floodin.

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A French drain is a trench dug in the ground into which a perforated tube is placed, and which is then filled with gravel or loose rocks. The purpose is to take water from wet areas and disperse it into dry areas.

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1 Plan the Location Figure out where the excess water is pooling and where you want it to go. When choosing an outlet for runoff water, look for retention ponds or other bodies of water, or tap into existing drainage. You can divert the runoff water to the road curbside if that's easiest. Do not drain onto a neighbor's property.

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FAQ This French drain calculator will help you find how much gravel you need for your French drain installation. In other words, this tool is our gravel calculator version for French drains. This calculator also finds how many drain pipes and filter fabric you need for your French drain.

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French drains, like the rain gutters on your home's roof, are designed to move water off your property, or to a spot where the water won't damage your home. As such, there must be an adequate.

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While the name "French drain" has led many to believe it originated from France, this is not the case. This specific type of drain was perfected by Henry Flagg French, then assistant secretary of the Treasury of the United States, back in the 1850s/60s.

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French drains are a common solution to yard drainage problems. But, not all french drains are created equally. How do they work?Here are some specific deta.

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French drains (or filter drains) consist of narrow trenches filled with gravel. The gravel fill includes a large percentage of voids which fill with rainwater. This rainwater is able to percolate through the gravel layers to a perforated drain pipe installed at the bottom of the trench.

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French Drain - Gravel Perforated Pipe - Holes Point Down. See examples of both holes up and holes down. Apple Drains Drainage Contractorswww.AppleDrains.comT.

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With a French drain, surface water flows into the trench, where it freely moves through the gravel. The bottom of the trench is sloped slightly, so gravity carries the water to an exit point at the end of the trench. At the exit point, the water can be collected in a large swale or a dry well, or it can simply flow into a suitable drainage area.

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1 Look for a spot with a downhill slope close to the problem area. The spot will need to be downhill enough for the water to run away from the problem area. In general, the drain will need to have a 1-2 percent slope drop for every 100 feet (30 m) of length.

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A French drain, which may also be called a curtain drain, perimeter drain, weeping tile, or agricultural drain, is a gravel-filled trench that includes a perforated or slotted pipe. These drains are used to direct surface water or groundwater away from a specific area, such as a home's foundation.

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French drains are a simple way of removing unwanted groundwater and consist mainly of a gravel-filled trench and some perforated drainage pipe. Water, either from the surface or in wet soils, is collected by the gravel and seeps into the pipe which carries it away. Steps for Installing a French Drain

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Step 1. Get the depth and slope right Digging is the hardest part of this job. Make the trench about a foot wide; in most cases, that's all you need to attract water. And make it about 18 to 24 inches deep; the depth will vary depending on the depth of your soggy area.