This is interesting indeed! The feeding station is reminiscent of the African keyhole garden with the central compost/manure/watering station.
I'm guessing that some people who have had way more rains since spring than their gardens could possibly need are just shaking their heads at the idea. But my area has been hit with a severe drought so I can at least see the possibilities.
My garden has subsoil of heavy marl soil, I have several rain gardens which take advantage of the water holding clay. Under normal conditions of natural soil moisture levels, I can actually maintain a shallow "paddy" without supplemental water. Perhaps, you've seen my growing rice threads in the Permaculture forum.
I 've also used the two paddies as swale/water reservoir and planted garden beds downslope of them to receive the percolating subterranean moisture. The trouble is, with right now, the earth is SO thirsty that the moisture is absorbed before it reaches some of the beds. I'm having a difficult time compensating.... when I water just the garden beds, the surrounding soil just SUCKS the moisture away like I never watered.
Rain, Rain, WHEREFORE art Thou, Rain?