I hope this email finds you well. I have modeled the annual water yield for my study area in the United States. When I review the pixel-based water yield map, the results and values seem reasonable, ranging from 0 to 1000 mm. However, the values appear somewhat unusual when I examine the watershed-level (HUC 08) output for total water yield (total volume in cubic meters). For example, in some watersheds, the calculated total water yield is around 60,000,000 m³. Does this value seem reasonable? If not, I would appreciate your thoughts or insights on these results.
That does seem like a lot of water, but it depends on how large of a watershed it’s draining from and what the annual precipitation and ET is in that watershed. If it’s a large watershed that receives a lot of rain, then that might be a reasonable value. Also, I think we discussed calibration previously, is the 60,000,000 m³ value pre- or post-calibration?
Thank you very much for the clarification. I haven’t calibrated it yet. The watershed is located in the coastal area of the Pacific Northwest, where there is significant rainfall, but the value still seems unusually high. However, the pixel-based map appears accurate. I’m not sure why the watershed-based map has such unusual values. Your thought?