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| The first
flush diverter routes the initial flow of water from the harvest
surface away from the storage tank.
A hose bibb fixture left slightly open (shown left as option ) or a pinhole drilled at the bottom of the pipe, allows water to gradually leak out. Water from the first-flush diverter be routed to a planted area if desired.
|
Although not shown here, equipping the standpipe with ball valve is better. As the chamber fills, the ball floats up, traps the first-flush water, and routes the balance of the water to the tank. |
How much water should you divert?
A rule of thumb is to divert a minimum of 10 gallons for every 1,000 square feet of collection surface. However, opinions vary, and the correct answer will also depend upon the number of dry days dust has been allowed to accumulate, the amount and type of debris, the intensity of the rain (see below), the roof slope, and any tree overhang. Even the season of the year can affect the amount of water to divert.
The rain intensity needed to wash your roof is a function of both the roof slope and the intensity of the rain.
-
Sloped Roof: Needs 0.10 inches of rain per hour.
-
Flat or Nearly-Flat Roof: Needs 0.18 inches of rain per hour.
A roof washer may also be needed for potable water or if you use the water for drip irrigation.
Once more: Particularly if you intend to use the harvesting system as drinking water, it is very important to consult a professional about your system.
For
further information about Renewable
Water and Energy in this area of Texas
contact
Terry
Jensen
972 251-1532 or 817 545-0140
Email
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