Time for a basement waterproofing inquiry!

Has anyone successfully waterproofed a basement and had it hold up to, e.g., today’s flooding? Our new-to-use cellar (approx 40% above grade, last refinished in 1966) handled all the recent rain until today. This morning we have leaking thru the walls and, as neighbors warned us would happen, backup into the toilet and shower down there. We are slated to renovate the space anyway, and now I think we should do some serious waterproofing of the things we can control (we cannot alas control an overwhelmed city system that pushes water back up into our house). I can wait for an awesome contractor. Thanks!