Rainwater Harvesting (OLD Version)
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ABCDEFGHIJKLMNOPS
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Peggy's Rain GaugeCistern Gauge Pictures
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Reference
the Quail Manor Weather Station Rainfall
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Rainfall:0.4inchesObserved Gauge CHANGE0 1.1Syntax: Major Mark(s) {space} Minor Mark(s)
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Rain Event IntensityRain Event Intensity
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IntenseLightAverageIntenseLightAverage
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Collected off Roof354146250gallonsCollected off Roof129gallons
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Cistern Water Level Increase10.54.37.0inches
Cistern Water Level Increase
3.8inches
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Expected Incremental Gauge Change0
3.01
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1.24
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2.13
major mark(s)Inferred Rainfall0.10.40.2Inches
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minor mark(s)
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Incremental % of Tank Capacity15%6%11%2,350gallons
Incremental % of Tank Capacity
6%2,350gallons
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"On average, pitched metal roofs lose 5% of rainfall, allowing 95% to flow to the cistern. Concrete or asphalt roofs retain around 10%, while builtup tar and gravel roofs can retain 15% to 20%. However, the percent of retention is a function of the size and intensity of the rain event, so more porous roof surfaces could absorb up to 100% of small, light rain events."
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