When flushing the plastic modular assembled reservoir in the rainwater harvesting and reuse system, the opening and closing of valves in the control equipment room are managed to allow rainwater from the reuse pump to flush the bottom of the plastic modular assembled reservoir through the flushing pipeline.

The rainwater harvesting and reuse system disturbs the sediment settled at the bottom of the plastic modular assembled reservoir, and then by activating the drainage pump, the turbid rainwater is discharged into the downstream municipal sewage network, thereby reducing the capacity of the initial rainwater storage tank,

namely the semi-volumetric diversion device. Semi-volumetric diversion devices come in various types, with differences in control accuracy and structural complexity.

Semi-volumetric diversion devices have no mechanical or electrical control structures, are safe and functional, and their advantages are more pronounced when dealing with larger diversion volumes, saving land resources and offering a higher investment benefit ratio. Some semi-volumetric diversion devices require manual emptying of initial rainwater after rainfall ends.

In certain regions with low and uneven rainfall, the rainwater harvesting and reuse system's water storage PP modules are injection-molded in one piece using polypropylene as the raw material. Through years of research and development, the module structure has been gradually optimized and adjusted, resulting in products with numerous advantages such as being pollution-free, resistant to acids and alkalis, aging-resistant, and durable. The modular design allows for flexible combination according to engineering needs.