Weed growth can cause lots of problems in irrigation canal systems, particularly in notoriously drought-stricken areas like California. It’s also quite a common problem along unlined canals because the earthen walls are nicely moistened with irrigation water, which makes for the perfect environment for many types of weeds. In shallow canals, weeds can even grow inside the canal itself.
All of this leads to a few problems. First of all, the weeds can clog irrigation canals, which means no water for your crops. Even if a canal isn’t fully clogged with weeds, they’ll still impede the flow of water—and that leads to not enough irrigation water reaching your crops. Last, weeds will drink the water meant for your crops. In a drought-stricken area like California, every gallon counts, and weeds will soak up a surprising number of gallons. This is why it’s recommended to line irrigation canals, especially in places like California. It prevents weed growth from happening, which means no blockages, obstruction or water wastage—and no need to weed your canals, either.
