Explain how early indus river valley civilizations used brick channels.

these brick channels were used in the process of irrigation!

Bricks channels were used for several reasons mainly for the water system and drainage system, these bricks were baked, both these system were constructed in the underground separately to prevent from getting flooded. The water system was used for household uses, drinking and public baths, the drainage system was used for sewage to throw dirty used water. It was seen that sanitation was maintained in the Indus valley civilization.