Your water won't just roll off like you thought. You want some water on top of the cover to help hold it down when the wind comes whippin later in the fall and winter. Some water on top is good. Too much water can be a bad thing.
Best way we found to help hold the cover down is go to your local Home Depot or Lowe's and find yourself some clips (that look like jumper cable clips). They are covered in a rubber material and cost around maybe .79 cents each. The make one size that is a large and then some little ones as well. We got both last year and never had a problem.
Hope that helps!
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