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In the second part of the film about rainwater tanks, I talk about how to choose the right tank size for your roof surface and average rainfall in Poland. 00:00 - introduction 00:08 - how to convert weather forecasts to liters and cubic meters 02:20 - how to determine the roof surface for rainwater collection 04:15 - how much water falls to the ground in each season - average rainfall maps in Poland plus average rainfall maps for spring, summer, autumn and winter. Average rainfall in Poland 08:25 - detailed daily and hourly rainfall forecasts 12:53 - how much water is needed to water the flower bed and lawn depending on mulching and grass cutting height 19:32 - how to choose the size of a rainwater tank so that it does not stand empty all year round 23:40 - what are the installation costs for a 10m3 concrete septic tank and a PE tank, how much does the installation cost, how much does a rainwater pump cost 26:06 - threats and disadvantages of rainwater installations 29:01 - summary The maps quoted in the video come from the Polish Climate Atlas 1991-2020, available online. Link: https://repozytorium.amu.edu.pl/bitst... It is worth noting that the last 4 years have shown that the total amount of rainfall may be higher than average, but there are also heavy rains and long, even 3-month droughts, which may force a different approach to the calculation.