How do I change Health/Happiness limit

[Poc]

Ok, so I know how to increase/decrease the health and happiness yield of a building/resource, but apparently there's also a health/happiness upper limit for each city. This means that even if I give +2000 health from a resource, if the city health limit is 40, then I gain absolutely nothing from having +2000. My question is, how do I change the city happiness/health limit?

 

[Refar]

If it is not hardcoded, i would expect it to be in the GlobalDefines.xML