In river transport, the problem of irregular levels of water can be overcome by?

In river transport, irregular levels of water can cause problems for ships or boats to navigate safely. Therefore, a solution is needed to overcome this issue. Building locks and canals is a solution to the problem of irregular water levels. Locks are structures that are built in rivers to raise or lower boats or ships from one water level to another. Canals are artificial waterways that are built to provide a navigable route between two bodies of water, usually at different elevations. By using locks and canals, boats and ships can navigate through a river system that has different water levels and avoid getting stuck or damaged. Changing the direction of flow, clearing water weeds, or controlling the current are not direct solutions to the problem of irregular levels of water in river transport.