Is It Possible To Build A Dual First Flush Diverter System?

Design Considerations

When building a dual first flush diverter system, it’s essential to consider the size of the system, the flow rate, and the type of materials used. A typical first flush diverter system consists of a roof catchment area, a first flush device, and a storage tank. A dual system would involve two separate first flush devices, each with its own storage tank, to accommodate different roof catchment areas or to provide redundancy in case of system failure.

Construction Techniques

One approach to building a dual first flush diverter system is to use a combination of PVC and stainless steel components. The first flush device can be constructed using a 4-inch PVC pipe with a 2-inch PVC pipe inserted into it, creating a diverter chamber. The 2-inch pipe is typically connected to a 1-inch pipe, which leads to the storage tank. The stainless steel components can be used for the roof catchment area and the storage tank. When constructing the system, it’s crucial to ensure that all connections are watertight and that the system is properly sloped to allow for gravity-driven flow.

System Sizing and Maintenance

The size of the system will depend on the roof catchment area, the rainfall intensity, and the intended use of the collected rainwater. A general rule of thumb is to size the system to accommodate a minimum of 1,000 gallons of storage per 1,000 square feet of roof catchment area. Regular maintenance is essential to ensure the system’s longevity, including cleaning the first flush device, inspecting the roof catchment area for debris, and testing the system for leaks and proper function.