Question

Как называется ежегодный подъем уровня реки весной

Answer 1

Называется половодье. Связано с таянием снегов.

Answer 2

Annual Spring River Level Rise

The annual spring rise in river levels is commonly referred to as "паводок" in Russian. This term is used to describe the seasonal flooding or rise in water levels in rivers and is particularly associated with the spring thaw and increased snowmelt.

This term is widely used in Russian-speaking regions to describe the phenomenon of rising river levels during the spring season.