Felt Drainage Pipe

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Felt Drainage Pipe

What is a Felt Drainage Pipe?

Thanks to the geotextile felt worn on high quality drainage pipes, the pipes are protected from impacts, climatic conditions and blockages. Geotextile felt is a non-woven material made of one hundred percent polypropylene fibers combined by needling method and turned into a filter by heat treatment. – There are ø80 – ø100 – ø125 – ø160 – ø200 options.

Geotextile Felt Wrapped Drainage Pipe Usage Areas

In agricultural lands In landscaping works In water drainage of construction foundations and curtains In reducing underground water levels In highway infrastructures In highway slopes and slopes In carpet fields and stadium construction areas In golf courses
In rainwater drainage
In trench drainage
In retaining walls
Drenflex felt PVC pipes are used in greenhouse areas.

Advantages of Felted PVC Drainage Pipe

Easy Assembly: Since our self geotextile wrapped drainage pipes are ready for installation, they should only be positioned in place. If pipe joints are required, they are joined together with the appropriate sized sleeve. Lightness and Time: Our lightweight drainage pipes, which are easily transportable, can be placed with a single personnel, providing great savings in labor costs. Flow Rate: Thanks to being wrapped on geosynthetic felt, it provides efficient drainage by preventing clogging of flow channels. Durability: Our felt drainage pipes with high strength are not easily crushed and do not lose their function by being damaged. Flexibility: Our drainage pipes are flexible. With the advantage of being shipped in rolls, it does not lose its homogeneity and provides benefits in transportation costs by taking up less space. Reliability: No complaints are received as there is no clogging thanks to felt drainage. It offers long-term use opportunities. Workmanship mistakes made during old drainage applications are also avoided.

Importance of Drainage in Agricultural Areas

Intensive water coming to the lands to be cultivated affects the normal development of plants by disrupting the heat balance in the soil structure. The amount of water that is more than needed fills the empty volume of the soil and prevents it from getting air and this situation prevents the development of plants. The chemical and physical structure of the soil can cause diseases in areas without drainage. Excessive irrigation also changes the water level in the subsoil, slowing or ending plant growth.

Choosing the Right Geotextile Felt for Drainage Pipe

In a correct drainage application, geotextile felt should be placed on the outermost layer. Thus, the gravel is filled with the fine material of the soil and the application works correctly, that is, filtration. In our felt drainage pipes, the felt is designed to wrap the entire system homogeneously. It will be useful if the felt to be used does not contain organic matter. In drainage applications, durable polypropylene felts should be used so that they will not melt, thin and disappear in the soil over time. Since most of the felts generally used are obtained from leftover fabric yarns, i.e. recycling, in order to be cheaper, they pose risks such as loss, thinning and rupture in the soil over time, which causes the drainage to not work properly. In felted drainage pipes, non-wowen (non-woven) pure polypropylene felt of appropriate weight should be used. Color is not an important factor when winding drainage pipes with felt. Raw material colors such as white and green may vary. In the market, recycled felts that are not original polypropylene (also referred to as gray grizzled or multicolored felts) or white recycled polyester felts are used in order to be suitable.

Choosing the Right Gravel for the Drainage Pipe

In a proper drainage, which should be the case, gravel accelerates the flow of water absorbed from the soil into the pipe. The gravel to be used should not contain fine material so that it does not clog over time.

New Generation Felt Drainage Pipe with Special Gravel System

In the new generation system, which is a special system with self-geotextile felt and self-gravel, water is transmitted to the pipe 30% faster than standard gravel thanks to the drainage grooves of geosynthetic gravel. The pebbles used in the new generation drainage system are synthetic. It does not disappear in the soil. In addition, this gravel system is very light and can be easily transported by a single personnel. Felt drainage pipes with special gravel system are shipped flat, not in rolls. Since this system comes completely ready-made, it saves time and labor costs both for wrapping felt and pouring gravel.

How to Join Drainage Pipes to Each Other?

Felt drainage pipes are no different from normal unsealed (bare) pipes. Drainage tongs should be inserted into the mouths of the pipes corresponding to the beginning or end of the pipes and supported on both sides until the settling sound is heard. Drainage pipe tongs should be selected according to the relevant thickness. In other words, Q100 drainage pipe should be fitted with Q100 drainage tongs, Q160 drainage pipe should be fitted with Q160 drainage tongs, Q200 drainage pipe should be fitted with Q200 drainage tongs.

Measurement System in Drainage Pipes

Q100 drainage pipe corresponds to 10 cm,
A Q125 drainage pipe measures 12.5 cm,
The drainage pipe Q160 corresponds to a size of 16 cm,
The drainage pipe of Q200 corresponds to a size of 20 cm.

Drainage pipe sizes can be purchased on preference, but if a generalization is to be made, they should be selected under the following conditions; 100 felt drainage pipes should be preferred for drainage of small areas and structures such as private property. In areas covered with organic soil where drainage will be difficult, 160 felt drainage pipes should be used. For drainage of large areas in structures longer than 50-60 meters, 200 felt drainage pipes should be used.

Drainage Types

Hendek Field Drainage

Subsoil drainage systems have been used for many years. In these field drains, the soil in the excavated pit is removed. The drainage pipe is laid together with the filter layer and the drainage pipe is connected to the nearest water collection area.

Placement

In areas where drainage is difficult, a planning is required for field drainage. In the grid or herringbone placement model preferred in carpet fields, athletic fields, green golf fields, secondary lines are connected to the main line and water drainage is provided. The distance between the secondary lines should not exceed 15 meters and the distance between the main lines should not exceed 30 meters. In addition, the flow slope should be increased as the line lengthens according to the length of the drainage. The diameter and height of the trench may vary according to soil types. In sandy areas, deeper and spaced applications are preferred, while shallower and more frequent drainage applications should be made for clay soil.

The minimum soil thicknesses that should be on it in order to prevent damage to the drainage applications are as follows; 15 cm in small grass fields, 20 cm in athletics fields, approximately 30 cm in fields with light vehicle load. In soils with high clay content, a permeable layer of 10 cm should be applied after the drainage application.

Field Drainage Application Stages

It can be applied in wet areas such as landscaping lawns and golf courses.

After the drainage area is determined, the main and secondary lines are drawn without digging the trench locations.
Start digging from the discharge point or discharge line. The diameter of the trench should be equal to the diameter of the felt drainage pipe to be used. While digging the trench depth, the slope and length of the line and the thickness of the soil layer to be used for drainage closure should be considered. The base elevation of the ditch is checked for its adequacy for the desired slope.
Felt drainage pipes are laid end to end by joining them with the help of tongs.
In soils with high clay content, a 10 cm layer of permeable sand is laid, compacted and covered with soil backfill in preparation for germination.

Foundation Drainage

The discharge of water from the foundation and curtain walls of the construction is provided by the drainage system. Felt drainage pipes placed on the foundation adjacent to the curtain wall allow the water to flow faster than the foundation elevation. They should be laid along the perimeter of the building, paying attention to the slope so that the pipe elevation is below the bottom elevation of the curtain. It should be ensured that the geotextile felt wrapped around the drainage pipe is not damaged during soil filling after laying. If possible, the water coming down from the roof or roof gutters should be connected directly to the rainwater line, if not possible, water discharge should also be done with trench drainage.

Retaining Wall Drainage

Retaining walls constructed to reduce the reverse soil load sometimes collapse due to high hydrostatic pressure. For this reason, drainage is very important for the continuity of the structure. Felt drainage pipes, which are applied with the same principle as the slab system on the edges of the shoes in the foundations, protect the structure by collecting and transporting the water behind the retaining walls and preventing the wall from collapsing or collapsing due to high water pressure. Depending on the shape of the retaining walls and the groundwater level, the felt drainage pipes are placed at the wall foundation level. During filling after placement, special care should be taken to prevent damage to the geotextile felt and loss of its function.

Gutter Rainwater Drainage

This system, which allows the discharge of water from rainwater gutters away from the building foundation, should be considered at groundwater level and in accordance with the peak water passage. It should not be connected with roof drainage systems in order not to load more hydrostatic water pressure on the drainage systems of the foundation or retaining walls of the buildings. Sealed drainage pipes used in the drainage of rainwater gutters should be placed at least 1-1.5 meters away from the building foundation. Water from roof gutters is drained with HDPE pipes without perforation until it reaches the felt drainage pipes. Depending on the terrain conditions, rainwater gutter drainage systems are positioned as follows;

Depending on the collection point of the rainwater gutter system coming down from the roof and the discharge saturation, the connection points of the felt drainage pipe system are determined.
The collection pipeline of vertical rainwater gutters and the areas where the pipes will pass are excavated. Felt drainage pipes should be excavated with the same excavation diameter as the pipe so that they remain above the ground water level.
Pipes placed in the trench should remain at least 10 cm below the soil level.
If the water from the gutters is filtered before it fills the sump, there will be no blockage.
After the trenches and excavation areas are filled with soil, they are sodded.

The choice of felted drainage pipe diameter should be equal to or larger than the diameter of the roof rainwater gutter.

Groundwater (Containment) Drainage

It is the most efficient system, which is a kind of trench drainage that collects and distributes groundwater and removes surface water from the relevant area. It also provides a solution for the discharge of septic systems depending on the land structure in the belt drainage made with felt drainage pipes. In this drainage system, it should be applied deep for groundwater level control and close to the surface level for surface water control.

Landscape Drainage

Soil in plant beds is used to prevent excessive water saturation and to prevent problems that could jeopardize the health of ornamental plants and the landscape. Felt drainage pipes can be placed regularly or irregularly in walkways and lawn areas, that is, in all landscaped areas. In applications to be made behind the landscape retaining wall, the location of the drainage pipe should be at least 45 cm deep, at least 60 cm deep if it consists of high trees or deep-rooted plants.

Golf Course Drainage

Felt drainage pipes are an excellent method for drainage systems of wet areas around golf courses, lawns and green area pits. The laying of drainage pipes for golf courses is carried out in the same layout as ditch drainage, but with special application in sand trap pits. When digging sand trap pits, the depth should start 4-5 cm below the level of the backfill sand and extend to the lower level of the felt drainage pipe.

Slope Drainage

Slope drains that prevent the flow of rainwater and snow water are also considered as a kind of ditch drainage. They help to collect water on soils with an impermeable surface and less or more sloping soils with less permeable layers. Slope drains run along a field line providing seepage and runoff protection. After excavating the slope drainage ditches, felt drainage pipes should be placed so that the pipe remains within the impervious surface for half the height of the pipe. In all sloping areas where surface runoff is high, felt drainage pipes should be laid by joining them with the help of tongs after excavating the length of the ditch. At least 15 cm of permeable filling material should be compacted on the drainage pipes. The application is finished after the trench is filled with surface soil.

Floor Drainage

Generally, there is no drainage in the foundations or surroundings of old buildings. During heavy rains and when the groundwater level rises during winter months, water comes from the ground or under slab voids. In such cases, drainage is done from the interior of the structure and discharged to the discharge point. In the drainage systems of the floor and underfloor cavity, the trench opened around the foundation in a way not to damage the existing infrastructure (electricity, natural gas, etc.) is dug at least 40-50 cm deep and at least 25 cm deep, if necessary, slightly below the foundation level, with a slope control towards the discharge point at the base. It is ensured that the bottom level slope of the 40-50 cm wide trench inside the building is made up to the discharge point. The application should be placed by calculating other connection points and drainage against the risk of swimming. After at least 5 cm gravel permeable backfill is made on the felted drainage pipe, concrete is poured into the hollow structure inside the building.