That motor has cooling air intakes at one end and you can buy or make a band that allows you to duct that air, if you are really worried about water you can go that route and duct the air intake so it's sucking in dryer air and not as much water, the thing that you need to worry about is dirt, not water, so I think it's well worth having duct work and an air filter to make sure the motor is getting clean air for cooling.
The Warp11 motor is tough and should do ok even running with water in it, as long as it's clean.
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