CHAPTER 6 - DRAINAGE
2021-2-17 · Drain pipes are made of clay, concrete or plastic. They are usually placed in trenches by machines. In clay and concrete pipes (usually 30 cm long and 5 - 10 cm in diameter) drainage water enters the pipes through the joints (see Fig. 101, top). Flexible plastic drains are much longer (up to 200 m) and the water enters through perforations ...
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