Basement is flooding

[Ali Gencarelli]

Hi, 

I'm looking for some advice. I have a basement that floods everytime it rains. I've tried a sump pump but that doesn't seem to be doing the job. I've read about painting the basement with a polymer type paint to prevent ground water from leaking in but the basement opens into the crawl space under the house and I'm afraid that any water from the crawl space will just be trapped and have no where to go we are talking about 12 to 18 inches of water. If anyone has any experience with this I'd like to hear how it all worked out. 

Thanks