This is the 276th most frequent Russian word.
уровень
Level.
In this sentence, the word 'уровень' (level) refers to the height or measure of water in the river, indicating a physical measure.
Уровень воды в реке повысился после дождя.
The water level in the river rose after the rain.
Here, 'уровень' (level) denotes the proficiency or degree of skill, used in a figurative sense regarding reading ability.
Эта книга подходит для читателей среднего уровня.
This book is suitable for readers of intermediate level.
In this context, 'уровень' (level) is used to describe a stage or layer in a hierarchical structure or process.