Ground water rechard

From the InVEST model diagram, it mentioned the ground water rechard. But in the text I did not find clear explanation whether the Water Yield excludes the ground water rechard.
I expect the result of the water yield = precipitation - (evaporation, transpiration) - ground water discharge
But from the input layers and the text, it's still not clear if and how the odel exclude the ground water discharge.
Any explanation is highly appreciated.
Viet Anh

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http://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/_images/fig1.png