narrow, artificial water channel made of stone or concrete, with water flowing through it

narrow, artificial water channel made of stone or concrete, with water flowing through it. The water is dark and murky. Green moss grows on the sides of the channel. A small, white object, possibly a rock or piece of debris, is visible near the water's surface. The camera moves closer to the water, showing the details of its flow and the channel's structure. The setting appears to be outdoors.