A divider box is a concrete structure that is built to divide a watercourse into two or more channels or to divert water from one channel to another. It typically consists of a concrete box or chamber that is built across the watercourse, with openings or gates on one or both sides to allow water to flow through.

A measuring weir is a concrete structure that is built across a watercourse to measure the flow of water. It typically consists of a concrete wall or barrier that is built across the watercourse, with an opening or “notch” in the top that allows water to flow through. The flow of water is measured by the difference in water level (head) on either side of the weir.

Both divider boxes and measuring weirs are used to control and measure the flow of water in canals, channels, and other types of water management systems. They are typically constructed using reinforced concrete, which is strong and durable enough to withstand the forces of flowing water.