Hello Timothy. Attached please find a brief tutorial How To Select an Inground Pool Winter Cover Please review the information detailed in Step 2. Dropping the water level has an impact on the winter cover size selection process. The Winter Cover should rest evenly on top of the pool water and not exhibit a concave appearance. Based on the pool dimensions provide and the 12"-15" water drop, the pool size should be considered to be 25' X 50' making the Winter Pool Cover for 25' x 50' Rect Inground Pool - PL7962 or Winter Pool Cover for 25' x 50' Rect Inground Pool - PL8962 appropriate.
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