Rainwater harvesting assembly and system

Abstract

A reservoir box (20) comprising an elongate hollow rectangular cross section body having sides walls (22), a bottom wall (24), and a top wall (25) which together define an internal volume (21) and open ends (31), wherein the side walls (22) include lateral connection formations (23) which are shaped and disposed to lock with the lateral connection formations of a laterally adjacent second box, and the side walls include vertical connection formations (26, 33) for connection of vertically stacked boxes.