Two phase coupling FLAC 8.0

I use the command “interior nwwell 0.0005 i=2, j= 3” to represent sources of C02 injection with a target volume rate of 0.0005m3/second in-situ at zone i=2, j= 3. Should the volume rate (0.0005) further divided by the area of zone i=2, j= 3?