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When the tree box filter is located next to the street, a storm drain inlet may be implemented, allowing stormwater to enter from the street gutter. [ 2 ] [ 3 ] [ 7 ] Stormwater from urban roof runoff can also be channeled to the tree-pits via roof drainage pipes.
This can be installed in an excavated trench. Specialised mole ploughs are available that can form the hole, insert the perforated pipe (and gravel if required), all in one simultaneous and continuous process. An extremely powerful (usually tracked) tractor is necessary. The flexible pipe is carried as a roll on the back of the machine.
The date of the construction of these ancient field drains is currently unknown, they are the forerunner to the modern plastic perforated land drain pipe and were built by hand. First by digging a deep trench anywhere from 30 to 90cms deep where the water was naturally gathering and/or where it was to be diverted.
In high groundwater conditions a perforated plastic (PVC or PE) pipe is laid along the base of the drain to increase the volume of water transported in the drain. Alternatively, a prefabricated plastic drainage system made of HDPE, often incorporating geotextile, coco fiber or rag filters can be considered. The use of these materials has become ...
Two types are most common, either biplanar or triplanar. Alternatively many very different types of drainage cores are available. They consist of nubbed, dimpled or cuspated polymer sheets, three-dimensional networks of stiff polymer fibers in different configurations and perforated mini-pipes or spacers within geotextiles.
A manufactured product composed of a series of parallel single drainage conduits (like perforated mini-pipes) regularly spaced across the width of the product and sandwiched between two or more geosynthetics (more often geotextiles). They are used for liquid drainage or gas collection while providing a separation and filtration function.
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