"something was expecting standard US units of inches per day"
No, it's changed, the standard is now furlongs per fortnight. It's much more poetic.
Currency exchange rates from www.timegenie.com on 2014-04-02
2866 units, 109 prefixes, 79 nonlinear units
You have: 1 inch/day
You want: furlong/fortnight
One of the units supported by a liquid flow controller for which I wrote the firmware was acre-feet per fortnight. OK, though it rolls of the tongue in a lovely manner, it didn't make much sense for the size of the controller and the industry for which it was targetted. But that unit actually does make sense to somebody managing a reservoir.