Does anyone know how to find the sewage flow generated in MGD?

   

I am looking for a basic formula. This is my question and given information….

Pre-Development Condition is 2000ac irrigated farm with an irrigation requirement of 3ac-ft/yr/ac.

Post Development condition is an urban area with a population of 150,000 and a per capita water use of 100gal/day.

What is the sewage flow generated in MGD???