Percolation Issue

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sandra blanco

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Jun 16, 2025, 8:11:04 PMJun 16

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Hi,

I have a SWAT+ model with gwflow groundwater module, and I’ve noticed some inconsistencies. When I set the perco coefficient to 1, the simulated percolation is too high, even exceeding the total precipitation. However, the streamflow magnitude matches my measured data fairly well.

On the other hand, when I set the perco coefficient to 0.98, the percolation values are more reasonable compared to precipitation, but the simulated streamflow is significantly higher than the observed values.

I don’t understand how percolation can be higher than precipitation. What could be causing this, and how should I correct it?

I’ve attached the model for your reference.

https://drive.google.com/drive/folders/1lb7f0TGi5pqx7cIFroVssHg2zFeccuO5?usp=sharing

Thanks in advance!

Best,
Sandra

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