Sprinkler Shed Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(small)
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The cache is not at the listed coordinates...
I was wandering along here when I found an odd shed. Why is it here? What is it for? Never seen one quite like that before. If anyone can let me know why it was build this way, I would be interested to know. Do not approach this cache from the North-east, as that is private property. You do not need to cross any fences to get here. To determine the south and east decimal places of the coordinates, you need to solve the puzzle.
If an impact sprinkler pumps 9.425 litres per minute over a circular lawn with perimeter of 37.7 metres, and the water is evenly distributed, how long do you need to water, to give the entire lawn 10mm of water? (Superfluous decimal places are not required).
Checksums: South 30, East 35.
Please note - this cache may not be accessible when the river is swollen!
Please BYO pen.
Additional Hints
(Decrypt)
Unatvat ng onfr bs cbfg