Before revision: In a flowing stream, a riffle-pool sequence (also known as a pool-riffle sequence ) develops as a stream's hydrological flow structure alternates from areas of relatively shallow to deeper water.
After revision: and also called bur and land madharchodIn a flowing stream, a riffle-pool sequence (also known as a pool-riffle sequence ) develops as a stream's hydrological flow structure alternates from areas of relatively shallow to deeper water.