Sizing Considerations

making an excavation

The ability of a French draining system to accommodate and successfully channel excess water that seeps in would depend not only on its design but its size as well. For a French drain to be effective, it must be sized properly. An alternative way to increase its capacity is the use of multiple pipes in a single trench. The additional pipe or pipes provide a means of escape in case the first pipe reaches its full capacity or is clogged.

The Amount of Water in the Area

There are many things to consider when accounting for the measurements of the drain or if additional pipes are necessary. Primary is the volume of water you expect to encounter. This could be difficult to estimate accurately, but there are ways to arrive at an approximation that you could work with. 

Knowing the rainfall pattern in your area is a good place to start. Rainfall, at least moderate to heavy rain, is one of the main sources of groundwater. Go online to familiarize yourself with the local average rainfall or consult your nearest weather station.

The other major source of groundwater is snowmelt. Runoff from snowmelt has more impact on groundwater than you might think. It contributes to the movement or cycle of water on a global scale, even in places where there is no snow. This is another reason to consult an expert for the sizing consideration of a French drain.    

Leakages from rivers and lakes are not significant sources of groundwater unless you live near one. This is another thing to consider when estimating the amount of water the drain has to channel.

The Measurements of the Yard

The size of your yard is another way to estimate the amount of water you could expect and accordingly allocate the French drain of the right size. The average rain and snowmelt would give you an idea of the amount of water in the general area, but the size of your yard would scale it down to your specific need.

The Lay of the Land

The topography in your area will also play a role in the amount of water that enters your property. If your house is at a lower elevation compared to your neighbor’s, or it is downhill on sloping ground, water will naturally flow into your yard.

Rule of Thumb

All things being average, meaning a rainfall of 32.2 inches, 8500 square feet of acreage, and typical seasonal weather, a French drain system with a single drain pipe built on a trench six to eight inches wide and 18 to 24 inches deep should be sufficient.

Exterior Drainage Contractors Near Me

We at A-1 Drainage and Excavation understand that, with the busy schedule of most homeowners, adequate drainage at home often becomes an afterthought. It is something that seldom gets needed attention until water has seeped into the basement or your yard has turned into mud. In short, when the damage is already done.

Let our team of professionals help. We can assess your existing draining system and recommend the best way to incorporate the French drain and make sure things are flowing smoothly. Call us now, and we would make sure that your home will never have to know flooding, standing water, and m