Quick Answer
Using a diverter typically reduces the size of your storage tank by capturing rainwater from the first flush of a roof, which is usually the most contaminated with debris and sediment. This allows for a smaller storage tank since the water quality is better due to the initial flush.
Understanding Diverter Functionality
A diverter is a critical component in a rainwater harvesting system, particularly when it comes to capturing the first flush of water from a roof. This initial flow of water is often the most contaminated with debris, leaves, and other particles that have accumulated on the roof. By installing a diverter, you can direct this first flush away from your storage tank, ensuring that the water stored is cleaner and fresher.
Impact on Storage Tank Size
The use of a diverter can significantly impact the size of your storage tank. Since the first flush is usually the most contaminated, you can safely store the subsequent water, which is of better quality. For example, if your roof collects about 1,000 gallons of rainwater per inch of rainfall, and your first flush is approximately 10-20 gallons, you can store the remaining 980-990 gallons. This means you can potentially reduce the size of your storage tank by 1-2% for every inch of rainfall.
Designing Your System
When designing your rainwater harvesting system, consider the size of your roof, the amount of rainfall in your area, and the type of diverter you plan to use. A good rule of thumb is to assume a 10-20 gallon first flush for every 1,000 square feet of roof space. This will help you determine the minimum size of your storage tank and ensure that you capture the cleanest water possible for your needs.
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