Hi,
I was running the hydropower water yield model with InVEST 3.7 on Mac.
I got results, but to me they don’t make sense. Especially when considering wyield_vol, which only amounts 0.020 m3.
Also wyield_mn is very different from the output\per_pixel\wyield_.tif.

I did various runs and tried to improve my input files to catch the error but no change in output.

Is wyield_vol from the aggregated watershed results? Is the value of 0.02 m3 for the whole watershed, or a sub-watershed? Are your inputs in a projected coordinate system (with linear units of meters) or geographic coordinate system (units of degrees)? They should be in a projected coordinate system, or the calculations for volume will be weird (and probably very small) when trying to calculate volume over degrees instead of meters.

wyield_mn is the mean per-pixel value within the watershed/sub-watershed. When you say that it’s very different from wyield.tif, did you use Zonal Statistics to calculate the mean wyield.tif value within the watershed/sub-watersheds and found it to be different than what the model output?