A crawlspace needs ventilation to remain dry, but the vents must be elevated to where it does not create an entry point for water. To lower the possibility of the vent leaking, the vent should be raised. It could possibly be removed, but ventilation under a home is just as important as keeping water out. The area around this slap could benefit in a drain to limit the chance of water running into this area.
If you have a question about your crawlspace, give me a call. I’d be happy to inspect it for you.