Manufactured from 100% recycled plastic bags » Over 21 million square feet installed over past 20 years » Interlocking design enables easy and quick installation » Low maintenance and cost effective throughout the product life » Durable, non-rotting and weather resistant This will allow water to drain away from the inlet and ensure gravity does all the work to distribute it along your drain lines.» Excellent water drainage through the surface Good Slope: Greater than 1% grade slope is ideal for your trench. Negative slope in your drainage pipe is bad if the goal is to drain away from a building as the negative slope can draw water back towards a structure or foundation, making things worse. The water table in the ground has to rise to a high enough level of saturation in order for it to flow through the system. This condition makes it impossible for water to flow through the pipe. Negative Slope: A less common but still undesirable pipe position is when the trench and/or pipe has a negative grade.
Its important that all of the water is able to dissipate, avoiding the invasion of roots, vermin, and bugs. These roots can and will gradually grow through the fabric destroying the integrity of your system as they seek moisture. Once roots enter the system they will block flow and reduce effectiveness.Ī properly built French drain that has low spots and retains water will NOT stop tree roots. Tree roots naturally seek out moisture in order to promote growth and are attracted to the standing water in your drain. This kind of pooling can be extremely problematic as it attracts one of the most detrimental things to drains. Pooling can occur, increasing the retained water within the drainage line. Low Spots: Be mindful to avoid low spots or dips in your trench. Zero slope systems will not allow sub-surface water to drain properly. No Slope: When the pipe is completely flat, water requires more energy to move through the drain. It's important that you take the time to ensure the pipe is at an angle that will allow the water to drain. The pooling of water in a drain pipe can lead to some major issues and create problems for your drainage system. Ultra-thick rip rap fabric (8 oz +) is best used in erosion control applications and not french drains. It provides great flow through rates and is strong enough to last the life of the drain. These are the most commonly used weighted fabrics to line a french drain. Use 4 to 6 ounce weight non-woven Drainage Fabric. Woven fabrics are commonly found as ground cover for weeds, and also under gravel driveway and paved road construction where strength is needed. Woven landscape fabrics typically have a greater pull strength, but in general do not provide a high flow rate, making for poor drainage. This type of fabric is also sometimes called landscape drainage or filter fabric for this reason. Nonwoven Drainage Fabric is designed to allow water to pass through while filtering dirt and debris from entering into your system and clogging up drain lines. Non-woven drainage fabric is specifically engineered for this purpose. For water drainage you will need a something that will let water easily pass through and also keep dirt and debris from entering in. Both fabrics have their advantages depending on the application. The two primary types of geotextile landscape fabric used are non-woven fabric, a permeable felt like material, and woven fabric. Select the correct type landscape fabric that will properly drain sub-surface water is key to installing a functional and long lasting French Drain. Selecting the Wrong type of Landscape Fabric (use non-woven)
Correctly built French drains utilize a non-woven geotextile fabric ranging from 4 oz to 6 oz in weight.
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If you want to ensure your system continually performs for decades to come then be sure to line your trench with professional-grade non-woven geotextile drainage fabric using the " Burrito Wrap" install method. The drainage fabric acts as a soil separator and prevents dirt and debris from mingling with your rock fill while allowing the water to freely flow.īy omitting this drainage fabric there is nothing stopping the subgrade earth from mixing in with your drain rock and this contamination will lead to reduced capacity and ultimately clogging/failure over time. Not Lining the Trench with Drainage FabricĪnother big issue contributing to early French drain failure is not lining the trench with a non-woven geotextile drainage fabric.
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