trunk drain, main drain, lateral drain an important, often the main, ditch in a drainage ditch system into which water flows from the rest of the system
trunk drain, main drain, lateral drain an important, often the main, ditch in a drainage ditch system into which water flows from the rest of the system
trunk drain, main drain, lateral drain an important, often the main, ditch in a drainage ditch system into which water flows from the rest of the system
trunk drain, main drain, lateral drain an important, often the main, ditch in a drainage ditch system into which water flows from the rest of the system