(Sorry, reposted.... just spotted an alternative: "recharge")

Feed is rather common... to keep the Chinese "回" would unnecessarily makes the sentence bulkier and less effective. I'll be content with just "feed"... (pls see the example below)

FYi:

http://www.ctic.purdue.edu/KYW/Brochures/GroundSurface.html
How surface water "feeds" groundwater.
The source of groundwater (recharge) is through precipitation or surface water that percolates downward. Approximately 5-50% (depending on climate, land use, soil type, geology and many other factors) of annual precipitation results in groundwater recharge. In some areas, streams literally recharge the aquifer through stream bed infiltration, called losing streams.

Left untouched, groundwater naturally arrives at a balance, discharging and recharging depending on hydrologic conditions.



Charles River Flagging Project 2000... most important seasons for replenishing groundwater that feeds the river. ... Aquifers, or underground lakes that supply much of the drinking water in ...
www.crwa.org/releases/flow20699.html - 5k - Cached - Similar pages


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Note added at 24 mins (2006-05-14 19:11:36 GMT)
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The idea of "replenish" is that something should go "empty" first before the need of it getting "refilled" comes about. I don't know whether water systems work that way...