I live in North Texas. Last weekend we received a large amount of rain. I returned to my master bath from a weekend away to find a mixture of water, dirt & silt everywhere in my bathroom. All of the tubs and showers in the house showed evidence of having water backed up into them through the respective drains but, this water was contained. I also had the water, dirt & silt on the floor. I have traced this back to the p-trap hole in my slab. Now here is my question. The hole was put in the slab for a garden tub that has a bottom drain on it and the tub is set on the top of my slab. I understand the need for the hole in the slab. How can I minimize my risk of having water come up through this hole yet again the next time a heavy rain falls? Any & all suggestions would be welcomed!