French Drain information and answers

French Drains can utilize  several types and sizes of French Drain Pipe.  An older type that is not commonly used any more is 4 inch PVC Pipe with large half inch holes drilled in the Pipe.  This doesn't work very well,   Because the holes are too large and the number of holes in the French Drain Pipe are too few.  Also there is no filter or "Soc" around this particular French Drain Pipe.  If it is used in sandy or loose soil the holes will clog and the pipe will fill up with sand.  PVC French Drain Pipe should be avoided.

ADS French Drain Pipe is much better, the holes are smaller and much more numerous.  It also comes inside a soc that acts as a filter and helps keep sand and debris out of the French Drain Pipe.  It works very well.

For Small business and Residential French Drains, Four inch ADS Perf/Soc French Drain pipe is adequate and the most common.  It is used for the majority of all French Drains installed.  French Drains can be installed using 3 inch ADS Perf/Soc but many times it is too small and can be overwhelmed by a heavy rain or from a bad design.  (Too many gutter down spouts connected directly into the French Drain, For Example)  Three Inch French Drain Pipe should be avoided if possible.

Six inch  ADS Perf/Soc French Drain Pipe is usually a good idea when possible.  It carries a much larger volume of water.  Six Inch French Drains are rarely overwhelmed.

Installing Gravel on top of a 6 inch French Drain

The Drawbacks to 6 inch French Drain installation are:  1.  The Materials Cost is higher for six-inch French Drain Compared to Four Inch Pipe.

                                                                                                                    2.  Many times 6 Inch French Drain Pipe is too large for many applications, Such as going under a fence or sidewalk.  

                                                                                                                   3.  The trench for a 6 inch French Drain must be much larger than a 4 Inch

                                                                                                                   4.  The amount of gravel or limestone or River Rock used to Cover the 6 inch French Drain is Much larger

 

All things being considered, the performance and longevity of a 6 inch French Drain is well worth it if you are trying to protect something of value to you!  If the higher cost and the additional labor and materials are not a problem and 6 inch French Drain pipe is not too big for what you want to do then a 6 inch French Drain would be the best.  

French Drain Installation can prevent water from getting into your air conditioner floor ducts.

French Drain in Flower Bed in Edmond

A common Drainage Problem for people in Central Oklahoma is ground water seeping into floor air conditioner  ducts.  This can cause very costly damage to a home or business.  Water-proofing Ducts, or even worse, trying to remove mold from duct work can cost big bucks.   Structural Engineers typically recommend  French Drain Installation  to keep water out of ducts.   French Drains catch and remove sub-surface water that is traveling underground toward a foundation. It is intercepted by the French Drain before it can seep under the building in question.   Because this water is not usually seen, it may not be taken into consideration when diagnosing drainage problems.  Surface Water traveling to a problem area is obvious as it flows on the surface in plain sight.

Gutter connected straight into 6 inch French Drain System in Oklahoma City

CMG has 21 years of experience Diagnosing Drainage Problems.  We always check for sub-surface water flow into any Problem Drainage Area.  Again, French Drains are intended to handle water moving both underground and above ground.

Installing Channel Drain Across Sidewalk in Norman

French Drains can also be used to remove water that is standing in a large area such as up against a foundation or along a fence.  French Drains don't do so well in tight small areas.  These areas are best suited for a Surface Drain with a grate.  Many times we install French Drains along foundations after a home owner has spent large amounts of money on foundation repair.

Surface Drain Installation in Edmond

Several Foundation Repair companies and Duct waterproofing companies recommend CMG for French Drain Installation.    Typically we install a French Drain by itself or as part of a Drainage System  after they have completed their repairs to the foundation or duct work.

Curb Outlet for French Drain in Edmond Oklahoma

Drainage Problems occur in all types of places.  Water can stand along fences or driveways, or in yards and flowerbeds.   Damage can be done to sidewalks and in yards.  Finding a good Drainage Solution usually involves a French Drain.

French Drain Running Through Low Areas in Yukon

CMG provides quality service for central Oklahoma.  If you live in Norman and need a French Drain, or if you live in Oklahoma City and want a Channel Drain installed across your driveway, give us a call.  We have installed Drainage Systems and French Drains in:  Oklahoma City, Edmond, Moore, Midwest City, Norman, Yukon, Mustang, Del City, Blanchard, Newcastle and all surrounding areas.

Installing Curb Outlet for French Drain in Oklahoma City

Recently we installed a French Drain in Norman.  Our customer had water running down the hill from his neighbor's Sprinkler System into the North wall of his house.  Over time the ground became saturated and water seeped under the wall and into his floor air conditioning vents.  We installed a 4 inch French Drain along the North wall of his house to provide a barrier to the continuous water flow.  In a few days the moss that was growing on the side of his house began to die from lack of water.  A Duct company came in and cleaned out is vents.  The French Drain removed the surface and sub surface water that was flowing into his home.   Problem solved.

French Drain Info and Design, Oklahoma City, Yukon, Mustang

The term, "French Drain" gets thrown around a lot.  Many times people say they need a "French Drain," when they mean Surface Drain, or Channel Drain.  It is becoming a Catch-All Phrase that may refer to any type of drain.  French Drains provide specific benefits that are different from Surface Drains.

Just what is a "French Drain?" Many times people incorrectly

A French Drain can protect your foundation!

use the phrase, "French Drain," when they mean "Surface Drain" or "Channel Drain."

Surface Drian

 

Channel Drain

 

A basic French Drain consists of a Perforated Drain Pipe in the bottom of a trench. The French Drain Trench runs through a Problem Drainage Area that needs to be drained.   The French Drain Pipe is perforated (Full of Small Holes) and has Neo-Prene Soc around the pipe.  This soc helps prevent debris from clogging the French Drain Pipe.

Perforated French Drain Pipe

 

The dirt that was taken out to make the trench is hauled away. It is replaced by some type of small stone or gravel depending on what is desired or available. I prefer crushed 1 inch lime stone. It is the most economical option in my area. Pea Gravel or some other type of small stone can work just as well. The lime-stone or gravel is placed in the trench on top of the perforated Drain Pipe and filled all the way to the surface (ground level). In some cases where the French Drain needs to be deep or is being placed in sandy soil, a special trench liner must be placed in the trench before the perforated Drain Pipe or the Gravel are installed. This helps maintain the integrity of the trench over time. It also increases the cost of the French Drain and the amount of time to install it. I install a trench liner in a French Drain about 20% of the time. Most of the time a liner in not needed.

French Drain March 2011

A French Drain is designed to handle a large volume of water and cover a large area. The Drain is anyplace the trench goes. It has many applications and can be used in many situations. It can be installed by itself or incorporated into a Drainage System with Surface Drains or Gutter Down-Spouts connected to it.

 

 

 

The main downfall of a French Drain is that they, for the most part aren't very pretty. They don't look very nice in a yard once they are completed.

Depending on the area the French Drain is installed and the type of grass around the French Drain, will dictate whether grass grows over the lime stone. Grass can grow up and through the gravel in the French Drain over time eventually covering the gravel. This is Ok. It won't have a measurable effect on the performance of the drain.

French Drain

 

DONT COVER THE GRAVEL IN THE FRENCH DRAIN WITH DIRT. THE FRENCH DRAIN WON'T WORK IF THE TRENCH IS CLOGGED WITH DIRT. DON'T EVEN INSTALL IT IF YOU ARE GOING TO COVER IT UP WITH DIRT.

DECORATIVE STONE CAN BE USED TO COVER A FRENCH DRAIN AND THEY LOOK GREAT AND LAST A LIFETIME.

 The French Drain Installation we did this week was a little more difficult than normal.  Many times the route that a Perforated French Drain Pipe must travel to its exit point is not very easy from an installation point of view.  French Drains may have to travel through tree roots, (big ones) under sidewalks, through retaining walls, around swing sets or dog kennels or Mom's Prize Rose Bush.  The 4 inch French Drain we installed this week was in Oklahoma City south of 23rd in an old part of town where all the houses were old 2 or 3 story homes with lots of huge Elm Trees.  The Elm Tree in Question actually was just an old stump that had been topped out but not completely removed.  They left the roots just for us!  The roots were growing into the homes foundation and were right in the way of the path of the French Drain.  Forty feet of solid Elm Roots and 4 chain-saw blades later CMG was successful in running a new French Drain through a tree stump.  Yuck! "Well you gotta  do what you gotta do!"

French Drain with colored river rock

A little info about French Drain Pipe and Tree Roots.  Normally tree roots don't seek out and penetrate French Drain Pipe.  Tree roots seek moisture and residual water that may stay inside Solid Drain Pipe.  French Drain Pipe is perforated.  Water that does not reach the exit point of the French Drain will seep out of the Pipe into the surrounding dirt.  Solid Drain Pipe that is used with Surface Drains can be penetrated and eventually clogged by roots if the pipe does not have good slope or "Fall".  If the solid pipe does not drain well and has residual water, tree roots will seek it out.
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Drain Pipe running from French Drain to the street in Oklahoma City

Drainage Systems are designed to protect your home or business from standing water.  Storm-Water Runoff can cause damage in many ways.  Water from your gutters can seep down into your home's foundation if it has no good way to drain off.  If the temperature then drops below freezing, the water around your foundation can freeze and cause serious damage to the home's foundation.  Foundation repair can cost more than a Drainage System.
Drainage Systems typically make use of , French Drains, Surface Drains, or Channel Drains.  Depending on the Drainage Problem, A Drainage System may utilize one or several types of Drains.  CMG might install, for example, A Surface Drain in the middle of a driveway that runs to a gutter that is connected into the drain pipe.  The Drain Pipe might continue to a French Drain running parallel to a homes foundation.  Next the drain pipe might continue to a channel drain cutting across a sidewalk.  The Drain pipe might then reach its exit point running out through a curb fitting installed and cemented through the curb.
A Surface Drain basically is a basin that has a grate on the top.  A drain pipe is connected to the basin below ground.  The water flows in through the grate and down into the basin.  The water then exits the Basin through the Drain Pipe and move toward the exit point of  the Drainage System.  Surface Drains are designed to handle water that accumulates in a low areas.   These areas should not be too large or broad, and the water that drains into a surface drain should not be moving very fast.  Surface Drains can become overwhelmed if they are placed in an area that must move a large volume of water, quickly.  Selecting the correct drain for the specific drainage problem is a benefit that CMG provides through twenty years of experience.

French Drain / Oklahoma City / Drainage System / Edmond, Norman, Yukon

CMG has installed French Drains and Drainage Systems in Central Oklahoma for 21 years.

 

Drains can protect your home and property from water damage.  CMG installs a wide variety of Drains in many different places.  A Drain or Group of Drains with Drain Pipe going to an exit point is a "Drainage System."

Drainage System / French Drain  Installation

Just what is a "French Drain?" Many times people incorrectly

A French Drain can protect your foundation!

use the phrase, "French Drain," when they mean "Surface Drain" or "Channel Drain."

Surface Drian

 

Channel Drain

 

A basic French Drain consists of a Perforated Drain Pipe in the bottom of a trench. The French Drain Trench runs through a Problem Drainage Area that needs to be drained.   The French Drain Pipe is perforated (Full of Small Holes) and has Neo-Prene Soc around the pipe.  This soc helps prevent debris from clogging the French Drain Pipe.

Perforated French Drain Pipe

 

The dirt that was taken out to make the trench is hauled away. It is replaced by some type of small stone or gravel depending on what is desired or available. I prefer crushed 1 inch lime stone. It is the most economical option in my area. Pea Gravel or some other type of small stone can work just as well. The lime-stone or gravel is placed in the trench on top of the perforated Drain Pipe and filled all the way to the surface (ground level). In some cases where the French Drain needs to be deep or is being placed in sandy soil, a special trench liner must be placed in the trench before the perforated Drain Pipe or the Gravel are installed. This helps maintain the integrity of the trench over time. It also increases the cost of the French Drain and the amount of time to install it. I install a trench liner in a French Drain about 20% of the time. Most of the time a liner in not needed.

French Drain March 2011

A French Drain is designed to handle a large volume of water and cover a large area. The Drain is anyplace the trench goes. It has many applications and can be used in many situations. It can be installed by itself or incorporated into a Drainage System with Surface Drains or Gutter Down-Spouts connected to it.

French Drain with Colored Gravel

 

 

The main downfall of a French Drain is that they, for the most part aren't very pretty. They don't look very nice in a yard once they are completed.

Depending on the area the French Drain is installed and the type of grass around the French Drain, will dictate whether grass grows over the lime stone. Grass can grow up and through the gravel in the French Drain over time eventually covering the gravel. This is Ok. It won't have a measurable effect on the performance of the drain.

French Drain

 

DONT COVER THE GRAVEL IN THE FRENCH DRAIN WITH DIRT. THE FRENCH DRAIN WON'T WORK IF THE TRENCH IS CLOGGED WITH DIRT. DON'T EVEN INSTALL IT IF YOU ARE GOING TO COVER IT UP WITH DIRT.

DECORATIVE STONE CAN BE USED TO COVER A FRENCH DRAIN AND THEY LOOK GREAT AND LAST A LIFETIME.

Drainage Systems can be made up of one drain or a combination of many drains.  Drainage  problems can be very complex.   Complex Drainage Problems may require a combination of several different types of drains all inter-connected and working together. Many times a French Drain, might be connected to a Surface Drain,  which then could be connected to another French Drain.   Other times the drainage problem may be simple and straight-forward requiring only one drain or several of the same type of drain connected together.

Cutting The Curb for French Drain Outlet

An example of a complex drainage system would be:  A French Drain in the back yard connected to a Surface Drain near a flower bed connected to several gutter downspouts, which are connected to a Channel Drain going across a driveway, which is connected to additional French Drain in the front yard, which runs to a Curb Fitting that lets all the water drain out on to the street.

A simple Drainage System might consist of a French Drain  which runs to a Pop-up Emitter which lets water drain over the curb and into the street.

An "Exit Point" is the term used for where all the water leaves the Drainage System.  Determining the Exit Point is very critical.  It is one of the first things we do when diagnosing a Drainage Problem.

Drainage Systems can:

1.  Keep water away from foundations -- A French Drain is best because it can move Surface Water and Sub-Surface Water (water moving under ground) away from the foundation.  Many times less experienced companies install Surface Drains to keep water away from foundations.  This can be a big mistake.  A Surface Drain can't move or drain Sub-Surface Water.   Also A Surface Drain often can't move enough water fast enough and easily becomes overwhelmed during a heavy rain.  A Surface Drain also can't cover or protect a broad enough area. Surface Drains should be designed in a Drainage System to be located in smaller Drainage Areas moving moderate amounts of water.  Surface Drains look better than French Drains.  If ,"appearance" is more important than Drainage Capacity, Go with the Surface Drain.  Just know what you are getting into and what your expectations should be. One side of a foundation alone,  can be over 100 feet.  A 4 inch or 6 inch French Drain is best when protecting a large area such as a foundation.

2.  Keep water away from small or inclosed areas.  This might be a low area just through a gate on the side of a house, or the low area between a flowerbed and the wall of a house, or standing water on or near a sidewalk or driveway.  These types of Drainage Problems are best served with Surface Drains.  A Surface Drain can move water away from a low area that is relatively small.  This can occur in yards, flowerbeds, sidewalks and driveways.  A surface Drain is designed to move Surface Water away from a problem area to a predetermined exit point.  Surface Drains are available in many sizes.  How quickly they remove standing water is usually determined by the size of the pipe that is connected to the drain.

Simply put, a Drainage System is one or a group of underground Drain Pipes that take water away from a place that has water standing on it or flowing across it.  The water that is in the problem area, can be causing damage or may be inconvenient or both.  (Usually Both)  A simple Drainage System is a Drain for the water to enter, a Drain Pipe to move the water away from the Drain, and an Exit Point for the water to be released out of the Drain Pipe.

Drainage Systems quickly can become more complicated.  Considerations must include:

How does the water get to the problem area?  There may be one or many sources.

Water Sources:

1.  It falls from the sky directly

2.  It flows down hill over the surface (surface water)

3.  It flows underground under the surface (sub-surface water)

4.  It flows from the edge of a roof ( There may be many roofs near the problem area, neighbors etc.)

5.  It flows from a gutter downspout

6.  It flows over the edge of a gutter because the gutter is too small is is clogged

7.  It flows up from the ground (seeps and springs are common in Oklahoma)

8.  It flows from a sprinkler system use ( yours or your neighbors)

9.  It flows from a leaking pipe ( water mains, water meters, water lines, sprinkler pipes, sprinkler valves)

There are other reasons for Drainage Problems, the above reasons are just the most common.

Once the number of water sources is determined, a rough estimate of the amount of water that needs to be drained away on average must be estimated.  This can be simplified down to "SMALL, MEDIUM, OR LARGE AMOUNTS OF WATER TO BE DRAINED AWAY.  You don't have to be an engineer trying to calculate fluid dynamics.  Experience at diagnosing drainage problems helps however.  How much water needs to be moved will help determine the type and size of the Surface Drain or French Drain that needs to be installed.  It also helps to determine the size of Drain Pipe required for the Drainage System.  A good rule to follow is, "If in doubt, install a larger Drain and Drain Pipe."  Unused Drainage Capacity is better than property damage caused by a Drain that is overwhelmed by too much water.

For home and small business use typical materials used are:

6 inch, 9 inch, and 12 inch Surface Drains -

3 inch, 4 inch, and 6 inch Drain Pipes --

3 inch, 4 inch, and 6 inch French Drains --

French Drains move more water than Surface Drains --

French Drains move Surface Water and Sub-Surface Water

Surface Drains move Surface Water only

Surface Drains look nicer than French Drains in most cases

Once the type and number of drains is determined and what size Drain Pipe will connect them, an exit point must be selected.  (Where is the Drainage System going to take the water to and release it?)

The Drainage Curb Fitting is installed when the desired exit point for the French Drain will release the Drainage Water into the Street.   The Drainage Curb Fitting is rectangular in shape and made to be installed through the curb.  A small section of Curb is cut out with a concrete saw.  The Section is a few inches wider than the Drainage Curb Fitting.  We then install new concrete around the curb fitting.  Once the concrete has dried, the Drain Pipe coming from a French Drain or Surface Drain is connected to the Drainage Curb fitting and then covered with dirt.

Curb Fitting with Acrylic Cement

The Drainage Pop-Up Emitter is connected to the end of a Drain Pipe.  It is downhill from a French Drain or a Surface Drain.  It is a small release basin with a green pop-up lid.  When releasing water, it pops up about an inch to release the water from the French Drain or Surface Drain.  When the Storm Water has moved through the Drainage System and out of the Pop-Up Emitter, the green lid closes back to its original closed position.  The emitter is designed to release water out into a yard or down a hill or other desirable Drainage Exit Point where there is no curb.

Popup Emitter to release water from a Drainage System in Yukon.

Drainage System installation and design is a big part of our business.  Does your sidewalk turn into a moat after a hard rain?  Does part of your yard look like a pond after a thunderstorm?  Worst of all, are you experiencing concrete deterioration to your foundation, sidewalk, or driveway.  CMG can design a Drainage System to solve your Drainage Problems.  Our Drainage Systems can be simple or complex.  We utilize, French Drains, Surface Drains, Channel Drains, Basin Drains, Basement Drains, Trench Drains, and Sump Pumps.  Estimates are free!

Large 6 Inch French Drain Installed in Norman

Just what is a "French Drain?"  Many times people incorrectly

use the phrase, "French Drain,"  to apply to many different types of Drains  that could be used in a Drainage System.