gravity

Water has a will of its own, observes Scott Cohen, and takes advantage of whatever pathways it can find -- quite often to go where you don't want it to go. Unchecked, it can lead to staining that will seriously mar a watershape's good looks, not to mention a homeowner's good mood.
Water on the Move
In my work as a construction-defect expert witness, I see a certain problem in the design and construction of spillways all too frequently:  When the system is initiated, the flow of water down the face of the dam wall will behave more or less as desired, holding to a narrow path into the pool or trough that awaits it.  After a time, however, that water will begin to migrate, spreading out farther and farther beyond the desired pathway until the material - usually some sort of
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