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Suitable conditions
It is suitable even when the roof is small. For example a 5 x 6 meters (that is to say 30 square meters) house, with 500 mm annual precipitation, receives a rainfall of 15.000 liters on its roof; this is a sufficient amount for a family formed by 5 members.
 {{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - Possible in almost any climate <br>- Rainwater generally meets drinking water quality standards, if system is well-designed and maintained <br>| convalign= "top" | - Storage is needed to bridge dry periods<br>}|}
==Resilience to changes in the environment==
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