drenotube®is also designed to be used in light live weight traffic applications. As an additional measure to guarantee that the pipe will not collapse under preassure we suggest to use drenotube® SN8 (ring stiffness) references rather than SN4
Another good practice is not to disturb the consolidated soil by adjusting the excavation width of the trench to the drenotube® diameter plus 5 to 10 cm only excavating a parallel walls trench (not a truncated cone).
Pressure acting (transferred) on drenotube® underground pipes depends on:
Pressure caused by the weight of the soil above the drenotube® + hydrostatic pressure caused by the weight of the water above the drenotube® + pressure caused by the live transport load on surface of the soil
Paved surfaces help to distribute and hence reduce live weight traffic pressure acting at the bottom of the trench (as a general rule at least divide by 2)
Figures of a live weight traffic reduction according to depth when backfill soil is compacted by layers (non paved surface):
Yes it is possible to cut drenotube® to a desired length using two long zip ties. Mark the place to cut and wrap the ties all around at each side of the mark. Distance from the tie to the mark 30 cm. (between ties 60 cm).Tighten the ties and cut by the mark. Remove excess beads. Retie the zip ties.
Subsurface drainage lines are often perforated and wrapped in geotextile or buried in a granular filter bed, and serve to carry water to the weep holes from areas deeper within the backfill. Hydrostatic pressure force the water through the bottom of the pipe, which effectively lowers the water level in the trench.
With the holes down the water will flow out of the pipe when installed and surrounding water will immediately percolate into the pipe through the holes and flow out of the pipe when it is installed with a fall.
** Water percolates quicker into the pipe
** Faster drainage.
** With the pipe perforation up only the area above the pipe holes will drain into pipe.
** For a 110 mm diameter pipe, the minimum drainage level in a totally perforated pipe it is at least 50 mm lower. Hence the required trench depth for a TP pipe is 50 mm less.
** Holes facing down if you want to drain as much water as possible.
** To avoid fines sediment settling in the bottom of the pipe it is better to use a pipe with a higher flow rate. It is a TP pipe.
Roots find for water an can damage any drainage system. If necessary use herbicides and sub-surface screen foils to avoid roots from coming into the pipe. Use the same techniques as for a traditional drainage.
First of all do not backfill with clay. It has a poor permeability due to its very fine particle size and it is very difficult for water to pass through. Backfill needs to be replaced for a sandy mixture to allow pass of water into the drain.
In this case drains distance needs to be reduced. In some cases an effective way to face the problem is to replace about 40 cm of the top clayey soil area for a highly permeable soil and install drenotube drains at about 70 cm in depth. It will allow to permeate all water through the top soil and collect it at the trenches.
The minimum safe cover to counteract the buoyancy force of water on drenotube® (floatation) is 20 cm of soil (density 1500 Kg/m3) however to protect drenotube® against unexpected living loads, 30 cm are advisable.
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