Just recently has storm backwater flood my basement through the 2 floor drains. A few weeks ago when my neighbor was draining his backyard pool I noticed remnants of slight flooding, but last night during the storm it flooded the entire basement by 2" with water gushing up through the storm drain. It eventually started draining again after about 15 minutes and the water flowed back into the drains.
Now I'm trying to avoid a repeat - can I install the one-way floor drain flood guards as protection? If so, will the water escape through the rest of my drainage system and flood upper floor drains? Or, will the water just "find its level" and stay low blocked off and isolated? Should I get a check valve at the source connected to the sewer?