Hi Handie,
One of the effect files that produces waterfalls is fx_WaterFall.fx if you want to make sure that file is in your effects folder. However, you are missing all kinds of effects from different effect files. I would recommend posting the problem in the Help and Troubleshooting section of the RTMM site as a new posting since it will get more views. Maybe someone will have experienced this problem before. In reposting the problem, make sure you mention if you can see smoke effects (like chimneys etc.). Be specific if it is just effects that involve water falls, sprays, water trailers, boat wakes etc.
I just can't think of why you would lose all effects associated with water and yet have other effects if, indeed, that is true.
Rod