Underground watersilo

A method for constructing an underground silo, the method comprising:

• a drilling rig disposed to drill at least one vertical cylindrical hole underground having a diameter measuring the same as an outside diameter of said underground silo;
• wet concrete poured at a bottom of said vertical hole underground;
• a closed-bottom removable cylindrical form with an outside diameter measuring the same as an inside diameter of said underground silo, and a length measuring at least the same as a wall height of said underground silo, said removable cylindrical form centered on said vertical hole and placed on top of said wet cement;
• a means to sink said removable cylindrical form inside said wet concrete to a desired level;
• a means to resist a buoyant force upon said cylindrical Formby the addition of wet concrete in an annulus between said vertical hole underground and said removable cylindrical form;
• wet concrete poured in said annulus between said vertical hole underground and said removable cylindrical form up to a desired level, disposed to function as said wall of said underground silo once set;
• a structural roof equipped with an access means into said underground silo placed on top of said wall of said underground silo once said removable form has been removed;
• backfill placed and compacted on top of said structural roof up to a ground surface.