Urban Stormwater Retention - strange values

Hello!

I’m trying to build a storwater retention model for the city of São Paulo, but I’m getting very strange results. Mainly in places where there are rivers, the retention and runoff values ​​return absurdly large values. But I can’t figure out what I’m doing wrong.

In the attached folder you can find the material I used and the results I got:

https://drive.google.com/drive/folders/1PpjUDdxWIBanZUM8orxRmCm_K02TYvKd?usp=sharing

If anyone knows what I might be doing wrong, I’d appreciate it =)