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Originally Posted by mntlblok
Been pondering the same. But, my assumption was that the ground level was somehow rising rather than sinking. Does dirt grow? Can thatch become dirt over such short periods? Tectonics would drag the sprinkler system along with it, no? Can grass roots raise the dirt level? (They'd wait a million years. . .).
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Rain would constantly be washing soil away into lower areas - like the ponds and lakes. The house area would be the last to sink because the roof is causing the rain water to stay away from the dirt level under the house.