In what ways can a meadow plant protect itself from prolonged flooding?

There is a wide variety of meadow plants. They should all have some protection against drought and flooding. That is why they have a large and developed root that sinks deep into the ground. This helps to anchor the plant, reach damp ground and keep itself from being washed out during heavy rainfall. Also, their shoots are generally tall. In case of flooding, a part of the plant will always be above the water and will be able to calmly exchange gas and photosynthesize. Leaves are mostly small.