Floodwater

This is reminiscent of a B-Rated horror flick that we all love to hate. You know the one...small town living, young people camping and partying...getting crazy...then BAM water zombies come out of the lake they are camping next to and chaos begins.

Then, of course, a couple of them become dinner, a few get away to alert the town (who initially don't believe them), and then BAM the town is overrun and converted to water zombies (after the townsfolk are bitten).

Did I mention that these water zombies become stronger in the rain and that there's a storm raging throughout the story .. but of course there is.