Clarification on the output units for SFCRNOFF

[psbecker]

I understand that SFCRNOFF is the accumulated runoff but wanted to clarify, does it give accumulated runoff in mm/s or in mm/time step?
For instance, if I have the time step at hourly and the output files at hourly, is the SFCRNOFF given to me in mm/hour?
Thanks

[cenlinhe]

The SFCRNOFF is a continuously accumulated quantity with a unit of mm from your starting point of simulations, that is you need to use the 2nd hour SFCRNOFF output minus the 1st hour SFCRNOFF output to get the total SFCRNOFF accumulated in the past hour which has a unit of mm/hour.