if your flooding (sewer) didn't get as far as messing up (clogging) the burner assembly (assuming it's a gas firing heater), all you need to do is turn off the gas, and start it by 1st manually start the pilot light (press the button while lighting the pilot)...keep pressing on the pilot for at least 30 secs or more, then release the button (button still pointing to light or pilot mark)...if the pilot stays on after you release it, then you can rotate the knob to on and it will light the entire burner assembly.
If your burner assembly is dirty due to sewer issues, make sure you mention that to your insurance adjuster. Depending on situation: you might ended up getting a new replacement water heater.
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