The average person in Wales uses 150 litres of water per day (www.environment-agency.gov.uk/homeandleisure/beinggreen/117266.aspx). It rains a lot in Wales!
The roof on our house is 265m^2, and the average rainfall in rural Monmouthshire over the last 5 years has been: (www.metoffice.gov.uk/climate/uk/datasets/Rainfall/date/England_SW_and_S_Wales.txt)
| (mm) | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| Days | 31 | 29 | 31 | 30 | 31 | 30 | 31 | 31 | 30 | 31 | 30 | 31 |
| 2008 | 181.3 | 60.4 | 132.9 | 72.2 | 93.2 | 61.4 | 158.3 | 167.1 | 125.4 | 155.4 | 107.4 | 86.2 |
| 2009 | 154.9 | 61.1 | 62.7 | 74.1 | 71.8 | 63.4 | 219.8 | 76.8 | 42.1 | 117.3 | 260.4 | 137.5 |
| 2010 | 97.9 | 78.4 | 91.1 | 39.6 | 45.5 | 34.5 | 105.8 | 110.7 | 116.0 | 98.3 | 130.7 | 46.5 |
| 2011 | 134.5 | 98.0 | 28.0 | 19.1 | 59.0 | 102.9 | 75.8 | 80.4 | 99.0 | 113.7 | 86.9 | 171.5 |
| 2012 | 103.8 | 43.9 | 30.0 | 175.8 | 58.2 | 182.2 | ||||||
| Average | 134.5 | 68.4 | 68.9 | 76.2 | 65.5 | 88.9 | 139.9 | 108.8 | 95.6 | 121.2 | 146.4 | 110.4 |
Taking the average, and multiplying by the roof area, we currently have the potential to capture the following amount of water:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Volume (m^3) | 35.64 | 18.12 | 18.27 | 20.18 | 17.37 | 23.55 | 37.08 | 28.82 | 25.34 | 32.11 | 38.78 | 29.26 |
| Volume / day (l) | 1149.59 | 624.67 | 589.33 | 672.75 | 560.26 | 785.11 | 1196.13 | 929.64 | 844.69 | 1035.85 | 1292.76 | 943.96 |
Our family consists of 2 adults and 2 little children currently, but I guess in the future, when we're considering the required capacity of this house, we should think that we might have 4 big children, plus the equivalent of several adults staying in our holiday cottage. A reasonable design capacity might therefore be: Family = 6 people, Guests = 2 people = Total 8 people = 8 x 150 = 1200l per day.
Putting these elements together gives a balance of:
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