Hi
I've lived in the general area (Villamartin to Punta Prima) for 12 years and have never known anything worse than a major thunderstorm causing some roads to be impassable for a few hours, and some beaches losing their sand as the water escapes to the sea. There is no local river to cause widespread flooding. On the contrary, there is a canal which, almost by definition) passes through the lowest points in the area.
I've never heard of any houses being flooded.
You mention amenities - be aware that the small supermarket in the Plaza is closing down, so the nearest supermarket will be Dialprix in Los Dolses.
Cheers
Steve