How does the water level in the river change throughout the year?

All rivers located in different parts of our planet have different sources of food. Most of them receive water from rain or melting mountain glaciers. Such rivers change the level of the flow depending on the year. For example, rivers in the tropics expand greatly and become flooded during the monsoon season. And those that feed on the melting of glaciers flood in the spring months, because at this time, in addition to ice, snow also melts in large quantities. Such rivers increase in width many times over.