Rivers can and do dry up.
dry up
if its really bad, dry them up.
Intermittent
There are many rivers that never dry up. In American the Mississippi, Columbia, and Colorada run year round. The Amazon, Yellow, Yangze and Nile also are constant and have been for thousands of years. Of course this excludes and tributaries or smaller offshutes of these waterways. The main rivers themselves always flow.
A river that never dries up is known as a perennial river. These rivers flow continuously throughout the year, regardless of the season or weather conditions. They are important sources of water for ecosystems, agriculture, and human populations.
a floods ends by when it stops raining and the rivers dry up
It tends to dry-up through the lack of rain
They will dry up because of the lack of water in that area the river is in.
The Rio Grande and other rivers dry up before reaching the sea because humans take so much water from them. Some rivers may also dry up naturally, or drain into a salt lake with no ocean connection.
They flood, dry up, get polluted, get covered up( LA has a river under all the concrete), diverted and damed up.
The water cycle would stop and the oceans would start to dry up.
All rivers drain into oceans.Although, due to humans drawing huge amounts of water for our cities, some rivers dry up before they reach the see nowadays.