There are various kinds of hydroponic cultivation system.
NFT is the most common and representative system among them.
run a thin water with nutrient on the cultivation bed and plant the vegetables on it.

In the cultivation method, it can be preventing the root to rot off due to the space between the water and the medium, also the roots can be breath, which is effective for healthy growth.

It is suitable for a multilayering Vertical Farming due to less water is needed for each layer.