Pipes used for waterline can be polyvinyl chloride (PVC), steel, galvanized steel or iron, cast iron and concrete or asbestos cement. Waterline pipes should be lightweight which can be transported easier and faster. Another consideration for waterline pipes is the health aspects. The pipes should be able to deliver a potable and clean water from the source or treatment facility towards the property whether residential or commercial.
The waterline underground system should not be contaminated and must be designed, constructed and maintained with the assurance of no problems of leaking which may contribute to the growth of bacteria that can cause waterborne disease. To backfill a waterline piping system should provide guarantee that it will not break during its working condition.
Trench should be designed in consideration of the pipe material of how the load from backfill, side support and foundation support contributes. Next is the foundation. The foundation soil should be uniformly distributed and compacted on the full width of the trench.
Choosing the soil foundation should be able to provide a uniform and stable support for the pipe. Now for the bedding, the thickness ranges from 100 mm to 150 mm depending on the diameter and material of the waterline pipe.
Now to completely cover the entire pipe, the backfill of soil material should be done in layer.. The purpose of this is to make sure that the soil is compacted well before it fully covered the pipe.
Lastly for the backfill cover, the maximum height for different pipe material depends on the diameter of the pipe.