Catching Rainwater
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Catching Rain Water
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Copy this spreadsheet to your own collection and edit the yellow fields.
You can follow the links to gather more information about your desired roof type and precipation of your region.
The rest will be automatically calculated.
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Rainfall in the area576 mm/m² per year
https://climate-data.org/
Info: mm/m² can be easily converted 1:1 to L/m²
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How much water a day do/will you need?150 l/day
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Runof coefficient (Metal roof)0.9
Study: http://icta.uab.cat/ecotech/2011_Roof_selection_for_rainwater.pdf
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How big must the roof be at least?106 m²
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Area of the roof you will have145 m²
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How many rainless months do you want to withstand?3 month(s)
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Minimum size of water tanks needed13500 L
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MonthJanFebMarAprMayJunJulAugSepOctNovDecTotal
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Average Rainfall in mm/m²
see: https://climate-data.org/
76 mm/m²73 mm/m²66 mm/m²53 mm/m²34 mm/m²14 mm/m²1 mm/m²3 mm/m²18 mm/m²69 mm/m²87 mm/m²82 mm/m²576 mm/m²
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Potential water catchment9918 L9527 L8613 L6917 L4437 L1827 L131 L392 L2349 L9005 L11354 L10701 L75168 l
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Water used4500 L4500 L4500 L4500 L4500 L4500 L4500 L4500 L4500 L4500 L4500 L4500 L54000 l
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Surplus/Loss5418 L5027 L4113 L2417 L-63 L-2673 L-4370 L-4109 L-2151 L4505 L6854 L6201 L21168 L
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Water in tanks13500 L13500 L13500 L13500 L13437 L10764 L6395 L2286 L135 L4640 L11493 L13500 L
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