Is It Worth Installing A Rainwater First Flush Diverter At Home?

Understanding First Flush Diverter Systems

A rainwater first flush diverter is a simple, effective device that separates the initial flow of water from the roof, which may contain contaminants, from the clean water that follows. It works by allowing the first few minutes of water to flow away from the storage tank, taking any debris with it, and then diverting the clean water into the tank. This is typically achieved by installing a diverter valve at the top of the downspout, which allows the first 10-20 gallons of water to flow away from the tank before diverting the remainder into the storage tank.

Choosing the Right System

When selecting a first flush diverter system, consider the size of your roof and the number of downspouts. A general rule of thumb is to install one diverter for every four downspouts. It’s also essential to choose a system that can handle the flow rate of your roof, which can be calculated by multiplying the square footage of the roof by the rainfall intensity of your area. For example, a roof with 1,000 square feet and a rainfall intensity of 2 inches per hour would require a system with a flow rate of at least 2,000 gallons per hour.

Installation and Maintenance

Installing a first flush diverter system is a relatively simple DIY task that can be completed in a few hours. The key to a successful installation is ensuring the diverter valve is properly seated and functioning correctly. Regular maintenance is also crucial to ensure the system continues to work effectively. This includes cleaning the gutters and downspouts regularly and checking the diverter valve for proper function.