When a landmass is covered with Green-Structures precipitation will be partly intercepted. 65% of the precipitation is captured by the Green Structures and “Active Evaporated” as water-vapour back to the atmosphere.
35% of the precipitation reaches earths surface and infiltrates in soil and is buffered in upper layers of the soil.
Superficial infiltrated water in soil is used by Green Structures for photosynthesis (water + Light + CO2 = Glucose = food for Green Structures) and as soluble for nutrients is soil.
A part of the water sucked up by the Green Structures is “Active Evaporated” by the plants for cooling purposes because plants get warm by solar radiation.
Due to Active Evaporation processes a Green Covered landmass transfers large quantities of Water-Vapour all over it’s surface to the Atmosphere where it condenses to Rain-Clouds all over the landmasses surface.
The part of the precipitation reaching deeper layers of the soil will become part of the underground water transport system by water-veins and finally become part of the surface water system (wells/streams/rivers) transporting water to the sea where the Water-Cycle starts again. Link Water-Cycle
For a deeper view about how Green-Structures spread Water all over Landmasses, Link The Biotic Pump