Reservoirs

A reservoir assembly free of external supporting braces having a base wall, a side wall and support means for supporting said side wall, and an end wall having a smaller radius of curvature than said side wall, whereby said end wall is substantially self supporting and is free of external bracing, said support means including a U-shaped supporting frame extending across said reservoir to support opposed portions of said side wall, said supporting frame being free of external bracing and having a base member in the form of a continuous beam formed integrally with the lower ends of opposed cantilevered wall supporting members whereby said beam resists outward splaying of said wall supporting members, said base member extending beneath said base wall such that the weight of the reservoir water applied through said base wall to said base member reduces upward deflection of the central portion of said base member and thus outward splaying of said cantilevered wall supporting members to a significant extent.