Nor­phel's flat snow tanks Flow of wis­dom

Down to Earth - - GOOD NEWS -

Struc­tures were more like fields of ice or shal­low pools that could store wa­ter Reser­voirs had to be con­structed only in ar­eas fac­ing north to get lim­ited ex­po­sure to sun­light Needed a lot of labour to con­struct th­ese struc­tures

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