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EO PLATEAU H I LL COUNTRY GULF COASTAL PLAIN <br />+ - -- Catchment area + #Recharge+ -•-- Artesian — • - - - - - - - - - - • - • - - <br />zone zone <br />0 <br />EXPLANATION <br />- F4wArac 1;iu�rct. ,�n��x�lnweu <br />Nla tad, Naww .on , .i.ad <br />(Biome et al., 2007). <br />Upper <br />Confining <br />Units <br />is I <br />sF o„ <br />Figure 3. General diagram of the vadose zone, water table, and phreatic zone of an unconfined aquifer. <br />Precipitation <br />Land surface I j <br />infiltration <br />Bedrock surface } <br />Vertical <br />i percolation <br />Water table VADOSE ZONE <br />River channel <br />\ \\ Flood plain <br />PHREATIC ZONE <br />Bedrock channel <br />(White, 1988). <br />Figure 4. The Edwards Aquifer Balcones Fault Zone — shaded. <br />-14- <br />•— BalCone$Faurt bone --• <br />