Kwelweglengte is one of the determining parameters of the piping mechanism, and indicates the length of the road that has to take off the seawater between the entry and exit point.

The entry and exit point is often taken comfortably in the interior and exterior of a dike. This is a conservative approach because, for example, a covering clay layer can bring out the entry point, and an inside of the exit point just inside. Other construction works are also discussed about a wavelength between an entry and exit point. Undercurrence

In a work of art, the wavelength length for immaturity is divided into a horizontal and vertical wavelength.

For the presence of mudguards, the vertical mudguard can be counted against the length of the screen relative to the bottom of the structure. This length may be counted twice as it is assumed that the water flows down the screen and then flows again along the screen and then underneath the structure. However, close two shields close together can cause a short circuit. This means that the water from the first screen flows directly and horizontally to the second screen. Then both screens can only be taken into consideration.

The horizontal carcass may only be counted for those parts of the structure with a foundation on steel. The water flows between the structure and the substrate and is resistant to resistance. In a foundation on posts, grounding may occur while the work of art remains. This may result in a gap between the structure and the substrate. The water does not experience any resistance anymore, and this horizontal length can not be counted for drainage. Backwardness

Backwardness also applies only to a horizontal hurdle. However, it may have a three-dimensional shape. For reverse loop, a direct line is assumed between the higher outdoor water level and the low inlet water level. In the vertical plane, screens can also be fitted to extend the wormway. These may be counted twice, as in the case of run-down.

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