## N

The location of the divide xd, where ^ is maximum, is obtained from xd$x xdxx

Note that xd could be larger than L or could be negative. In those cases, the divide does not exist, and the flow occurs in one direction throughout the aquifer.

### Radial Flow with Infiltration

Figure 9.4.6 shows radial flow in an unconfined aquifer with infiltration. If a cylinder has a radius r, the amount of water infiltrating into the cylinder is equal to Qin = Not2, and the amount of water flowing out of the cylinder is equal to 2ot • hqr = 2m"Qr. The continuity of flow requires that 2m"Qr = Not2, giving n N

Qr = Tr which can be written as yielding

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