I am a part-time civil engineer and a mother. Unless I am missing the point of your question, I don't know why you link how you are paid to whether or not you have a P.E. Having a P.E. only means you are worth more(get paid higher), but has nothing to do with the contract between your employer...
I have one house that I am hooking up to a sanitary sewer main 200 feet away via an 8" HDPE pipe, therefore pipe not flowing full. How do I calculate what pipe slope is necessary to flow successfully?