is a water main a drainage system
The main drainage system is a water-conveyance system that receives water from the. field drainage systems, surface runoff and groundwater flow, and transports it to the outlet. point. The main drainage system consists of some collector drains and a main drainage canal. A. collector drain collects water from the field drains and carries it to the main drain for disposal. Collector drains can be either open drains or pipe drains. The main drain is the principal drain of an area.