2.2 MebradrainMebradrain consists o

2.2 Mebradrain
Mebradrain consists of a prefabricated strip which is very suitable for water transportation. The flexible core is manufactured of a high-quality polypropylene. Both sides have grooves, through which water can flow unimpeded. The core is wrapped in a strong and durable geotextile filter fabric with excellent filtration proper-ties, allowing free access of porewater into the drain. At the same time, this filter prevents piping of fines from adjacent soils without clogging.
The drains is manufactured in a width of 100 mm, a size accepted as standard worldwide. Mebradrain is available in 2 types:
MD 7407/7007
Which is a drain type with high discharge capacity, suitable for depths upto 40 meters ;
MD 88
is a drain type especially suitable for very compressible soils consisting of very fine uniform particles.
Both types are available with a filter that can be adjusted to specific soil conditions. Mebradrain has grow into one of the most used drainage systems in the world, and the multiple applications of Mebradrain in lost of projects throughout the world prove that customers have confidence in our product. By the end of 1992 a total of over 100 million meters of Mebradrain had been installed world wide.
Advantages of the Mebradrain system :
*The least possible disturbance of soil layers
*A guaranteed water discharge
*The possibility of adapting the core and the filter to specific soil conditions
*The high installation rate : 4,000 to 8,000 m per day/unit
*The adaptable spacing, thus enabling a very short period of consoldation
*No water requirement for installation
*Drain installation possible to depths exceeding 40 meters
*Easy control of installation.
2.3 Sanddrains
The core of the Mebradrain guarantees a higher vertical dis-charge capacity than a sanddrain with a diameter of 300 mm. Assuming that the equivalent diameter of a 100 mm synthetic drain amounts to 65 mm, comparison between both drain distances can be made by using the Barron formula. Adjoining graph shows that, theoretically, approximately, twice as many drains should have to be used in order to result into similar progress in settlement. Because of the considerably lower price of synthetic drains, this system is ultimately much more cost-effective than sanddrains.
2.4 Filter Fabric
The filter jacket has an important function. It consists of thermically bonded polypropylene fabric of a random texture.