culverts
with a diameter of about 1.5m, depending on the flow of water that drains diameters vary by design. During the construction process drains, manholes and pits dug in the soft soil, it should piling Melaleuca or iron poles, 1 square meter of about 25 piles Melaleuca tree, the aim is to secure the land, against subsidence, erosion control worry.
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