As mentioned before, for drainage pipes installation, we need to use sand, chipping and bedding. Using chipping and sand gives harm to ecosystem in long term. Therefore, felted drainage pipes started to being used in drainage lines instead of regular drainage pipes. Felted drainage pipes are manufactured by rolling natural senthetics. This felt prevents sedimentation and deposition. In the drainage projects, felted drainage pipes gives you cost and time save. It is very important that the felt is woven like a rug. A felt which is not manufactured by a machine can not filter the water. This may cause a failure of discgharge of water.