Streamflow decreasing with time

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Sherly Shelton

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Apr 28, 2026, 1:09:50 PM (4 days ago) Apr 28

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Hello everyone,

I ran a WRF-Hydro simulation for one month at 4 km resolution using the CONUS404 dataset. The model ran smoothly; however, during my analysis of streamflow, I observed a high peak at the beginning of the simulation followed by an exponential decrease over time.

I am trying to understand whether this behavior is due to insufficient model spin-up or if it is related to an issue with the precipitation forcing data. In the CONUS404 dataset, precipitation is provided as accumulated grid-scale precipitation over the previous 60 minutes, which I converted to mm/s by dividing by 3600.

I have attached the streamflow plots for the simulated period for reference. I would greatly appreciate any guidance on whether this pattern indicates a spin-up issue or a potential problem with the forcing or model setup.

Thank you for your help.

Sherly

Picture1.png

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