What are the health risks of speed swimming in an indoor pool that is too warm?

Being a registered nurse / ex paramedic who has treated many patients with dehydration , I can tell you from experience..i am also an avid swimmer, both for fun and cardiovascular / health benefits. Just because you are wet while swimming , does not mean you can't fall victim to dehydration. The warmer the water / ambient temperature, the more likely this can occur. So the point is.. Drink lots of water before, during, and after your swim.