Irrigation is the controlled application of water to land for agricultural purposes. It's often used in areas with irregular rainfall or drought.  Here are some types of irrigation: Surface irrigation: Also known as furrow or flood irrigation, this is one of the oldest irrigation methods. It involves flowing water down small trenches running through crops. Sprinkler irrigation: Uses a series of pipes to move water from the source to spray heads. Subirrigation: Also known as subsurface irrigation or seepage irrigation, this method delivers water directly to the root area from below the... Show more

Irrigation is the controlled application of water to land for agricultural purposes. It's often used in areas with irregular rainfall or drought. 

Here are some types of irrigation:
Surface irrigation: Also known as furrow or flood irrigation, this is one of the oldest irrigation methods. It involves flowing water down small trenches running through crops.
Sprinkler irrigation: Uses a series of pipes to move water from the source to spray heads.
Subirrigation: Also known as subsurface irrigation or seepage irrigation, this method delivers water directly to the root area from below the soil surface.
Centre pivot irrigation: This self-propelled system uses a central pipe with outlets that rotate around a central pivot point.
Furrow irrigation: This method supplies water to crops through shallow, evenly spaced furrows. 

Dams vs Weirs
Dams: Walls, usually curved, that are built behind to form a lake. Dams are often built to provide hydroelectric power. In a dam, water overflows through a spillway.
Weirs: Small, impervious barriers built across a river to raise the water level on the upstream side. Weirs are essentially small-scale dams. The water overflows over the weir. Weirs have been used for a long time to control the flow of water in streams, rivers, and other water bodies. 

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