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How soon should a rain-barrel first-flush diverter drain?
How quickly should a first-flush diverter empty after rain before it’s worth checking for a blockage? I’d like to keep dirty roof runoff out of the barrel without wasting collected water by flushing more than needed.
Would you start with the barrel’s inlet screen and the diverter’s drain opening? I’m also curious whether roof debris or a mosquito screen changes how often those need cleaning, and what signs suggest the diverter isn’t draining properly rather than just taking its time.
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3 replies
There isn’t a universal time threshold: diverter designs and drain openings vary. If the manufacturer gives an expected drain time, use it as a baseline. If it’s still holding water well beyond that, or hasn’t reset before the next rain, it’s worth checking the drain opening for blockage.
Yes - those are sensible first checks. Debris on the barrel inlet screen can restrict flow into the barrel; a clogged diverter drain opening can stop the chamber from emptying and resetting. Check them separately so you can see which, if either, is obstructed.
The heavier the roof debris load, the more often it’s worth checking the inlet screen and diverter drain; after a stretch of windy or leafy weather, check sooner rather than relying on a fixed calendar. A mosquito screen can also catch debris and restrict flow, so inspect it along with the inlet and clean it when it’s visibly dirty or impeding flow.
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