MacDrain TD proved its effectiveness in a recent project by lowering the cost of the project by 50% and providing a 76% higher flow capacity when compared to previous methods.
In comparison to pre-existing trench systems made of gravel and geotextile, MacDrain delivers a 76% higher flow capacity and lowers the cost of such installations by 50%. The product is featured by the August/September Railway magazine.
An article by the VLI (Integrated Logistics Value) member Gesmar Nunes de Almeida Junior, stipulates that the use of technologies associated with drainage geocomposites should be used permanently to solve the challenges involving the underground drainage of infrastructure works.
The opinion of the engineer was published in the August / September Railway magazine that covers rail, subway and metro works in Brazil since 1940. Recently, Paulo Rocha, an experienced Maccaferri engineer and instructor said in relation to Maccaferri’s most commonly used geocomposite MacDrain, that “the MacDrain geocomposite stands out due to its high capacity, with significant development, environmental and economic advantages”.
Maccaferri MacDrain geocomposite replaced conventional drains, composed of geotextile and gravel, on the stretch of railway line under discussion, where erosion had damaged the 150m long local drain.
The McClelland methodology for determining the underground inflow made it possible for the flow rate per meter to be maintained by inserting each tube into the stand drain to scale the drainage system needed to capture and transport the water flow. It was noted that the project demanded a flow rate capacity of 0.3 l/s/m per trench and it took two minutes to lower the water level.
The flow capacity of the geocomposite MacDrain TD was compared to the trenches made of gravel and geotextile. The result showed that MacDrain has a 76% higher flow capacity. Also, handling and transportation costs are lowered thus reducing the total cost of the solution by 50%. This is because excavated materials are used in the trench backfill as opposed to other imported granular materials. The implementation of the new drainage trenches required the installation of 30 m long MacDrain rolls each weighing about 20 kg. The process required the work of three workers and a trench digger to open the drainage ditch.
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