Preliminary estimating tool — not an engineering document. Provided free for rough screening only. It is not sealed, is not a professional engineering service, and creates no engineer–client relationship. It models the gunite shell and bond beam alone and ignores the deck, finishes, toe or hold-down slabs, equipment, reinforcement, site-specific soil and groundwater data, construction sequence, and hydrostatic relief provisions. It cannot tell you whether a specific pool is safe to drain. Do not drain a pool based on this tool. Oasis Engineering accepts no liability for any use of it. Verify every result with a licensed professional engineer.