Good Morning,

I’m starting with calculations in SS credit 6.1. But I have a question:

Can I use the runoff data of the watershed where is located the project?
Because in my understanding I must use Rational Method just for calculate the runoff in a watershed but not in a square site. The lot area is 47.762 m2 and the watershed where is located the project is in Bogotá city.

Thank you very much.