Quick Answer
During heavy rains, greywater should be diverted away from the main water collection system to prevent contamination and ensure clean water supply. This can be achieved by installing a divert valve or a separate greywater drain system that can be isolated from the main water collection system. The diverted greywater can then be treated or stored for non-potable uses.
Greywater Diversion during Heavy Rains
Greywater diversions can be installed at the connection point between the greywater pipe and the main water collection system. This typically involves installing a valve or a diverter that can be opened to isolate the greywater system from the main collection system. A good practice is to install a greywater diversion system that can handle up to 1 inch of rainfall per hour, which is a common design standard for rainwater harvesting systems.
Greywater Storage during Heavy Rains
During heavy rains, it’s essential to ensure that greywater is stored in a way that prevents contamination and ensures safe reuse. Consider installing a separate greywater storage tank that can be isolated from the main water collection system. This tank should be designed with a capacity of at least 10% of the total household water demand, and should be equipped with a first flush device to remove any contaminants that enter the tank during heavy rainfall events.
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