IMO water is a huge weakness in Poser. This result took me hours to achieve and still isn't quite right, but I am quite pleased with the patches of green weeds floating on the surface.

This shader (& its variations) is intended for large bodies of water such as the sea, lakes, rivers etc.

When I've finished twiddling with it I'll post the material files in freestuff. 

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Windows 10 x64 Pro - Intel Xeon E5450 @ 3.00GHz (x2)

PoserPro 11 - Units: Metres

Adobe CC 2017