I’m building a rain catchment system for my place this weekend and I have a question for you experts. Does the roof angle or roof shape affect the amount of collection if the sq footage of the roof is the same? I’m trying to decide if a straight slanted roof would collect the same amount of water as say an “A” shaped roof or a “V” shaped roof.
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Yes. If you had a 10’x10’ piece of sheet metal and it was standing vertical, your roof would only be the equal to the width of the sheet metal. That’s an extreme, but now imagine tilting it at a 45°- you still wouldn’t be utilizing the full 100sqft footprint.
Images on this site explain it much better than me:
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The catchment systems will have a 40sq ft tin roof(5x4) angled at about 30* facing SW emptying into 2 55gal plastic drums. If my calculations are correct I should be collecting appropriately 25 gallons per inch of rain(0.623x sq footage). I’ll also be reducing the size of the water trough from 55gal to probably 10 to 15 gallon to minimize evaporation. I’ll post up pics when I complete the project. Thanks again for the insight gents.
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Originally posted by joel45acp View PostThe catchment systems will have a 40sq ft tin roof(5x4) angled at about 30* facing SW emptying into 2 55gal plastic drums. If my calculations are correct I should be collecting appropriately 25 gallons per inch of rain(0.623x sq footage). I’ll also be reducing the size of the water trough from 55gal to probably 10 to 15 gallon to minimize evaporation. I’ll post up pics when I complete the project. Thanks again for the insight gents.
X .623 = 12.46 gallons / inch of rain.
Without photos I am assuming you catch into a drum, then supply a trough
By float.
FWIW I used a 1 gallon dog water dish With float from tractor supply that worked well. Fenced from cattle and pigs.
BP
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Originally posted by Big pig View Post5x4= 20 square feet?
X .623 = 12.46 gallons / inch of rain.
Without photos I am assuming you catch into a drum, then supply a trough
By float.
FWIW I used a 1 gallon dog water dish With float from tractor supply that worked well. Fenced from cattle and pigs.
BP
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Originally posted by joel45acp View PostI’m building a rain catchment system for my place this weekend and I have a question for you experts. Does the roof angle or roof shape affect the amount of collection if the sq footage of the roof is the same? I’m trying to decide if a straight slanted roof would collect the same amount of water as say an “A” shaped roof or a “V” shaped roof.
There was enough rain last night it would not haave mattered.
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