I'm curious about what this entails or means.
Retaining walls? (re)Injecting soil life like worms and microbes and related nutrients? Tossing around compost for likewise?
Some of the plants will have very good root depth, but all plants together will foster macro and microbiology, especially fungi, which will hold the soil together and at the same time spongify the soil, so that much more water will be absorbed than bare soil.
See the slake and water infiltration test, for a demonstration of bad vs good soil.:
If your soil falls apart in the presence of water AND doesn't allow fast infiltration, you've got landslide and flood conditions. If your soil holds together and absorbs OR drains water, you've got prime agricultural conditions instead.