Laiders -> RE: On Siwa planets (6/15/2020 1:19:49 AM)
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Arid is not normally taken to refer to % of ocean on planet though. Aridity is defined by average annual precipitation. My current planet is defined as a 'very dry planet' but it has average annual rainfall of 719mm. Definitions of aridity a little difficult for my philosopher brain to understand [I have overused the word 'parse' recently due to rules discussions and AI discussions; I now seem to type it for any form of understanding not its actual meaning] at 2am with no prior experience. Buckle in this is going to require some maths. We start, wiki assures me, by multiplying average annual temps by 20. I can that. I am little north of the tropics I will use that value. It's 41 C year round. Wow this is a hotter planet than I remember. Multiply by 20 = 820 We now [ah the famous know-now merger; a common linguistic shift seen in tired speakers of Dyslexic] add a value depending on a parameter I do not know. We add 280 if more than 70% of precipitation falls in sun-high seasons, 140 if it's between 30-70 and 0 if neither. Assuming rain falls evenly throughout the year, 50% must fall in sun-high seasons. We add 140. We are now at 960. This is the threshold for not being semi-arid not arid and certainly not desert. My annual rainfall 719mm and I assume this applies evenly across the whole region. My area has lots of grass, lakes and several dense forests so rainfall is actually probably higher. 960 - 719 = 241. I am 241mm off not being semi-arid. This probably actually does put me close to the arid threshold. If I were further north, it would not. Wait a minute, you can see a rolling average of rainfall per hex. This would make the maths too complicated so I am not going to average rainfall over my entire empire and run the numbers again. I have found a village that is comfortably not arid with average rainfall of over 1000mm. IOW, aridity is a climatic factor not a physical factor. Total % water does not matter only annual precipitation and average temperatures.
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