Final answer:
Concrete channels are typically used to convey stormwater due to their durability and effectiveness in preventing flooding. The correct option is 3.
Step-by-step explanation:
A concrete channel is typically used to convey stormwater. Concrete channels are made of a durable material that can withstand the force of flowing water and are commonly used in stormwater management systems. They are effective at directing water away from urban areas and preventing flooding.
While steel channels, asphalt channels, and corrugated metal channels can also be used for stormwater conveyance, concrete channels are often preferred due to their longevity and strength. Concrete channels can be designed to fit different sizes and shapes, allowing for efficient water flow.
Hence, Option 3 is correct.