I'm trying to convert to metric a WQ example file you posted in Feb 2009 (RUNOFF43_SW5.INP). The problem seems to be in the factor C1 of the EXP function used to describe the Wash-off process. I get a relatively close match (in the magnitudes & patterns) of the washed off constituents at the outfall, only
if I use ONE PERCENT of the metric conversion factor : [ 1 / (2.471 * 0.4536) = 1/1.121 = 0.892 ] which converts pounds per acre to kilograms per hectare.
Why this conversion factor of (~ 0.892 )* C1 for the EXP functions should be divided by 100 to approx. reproduce the original file (in the US customary units) results? Or perhaps I'm missing something obvious?
Thanks & Regards,