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All true. However they were OK with the idea at the start and didn't raise an issue until full design was completed. I am in reviewer hell here with Army Corps, EPA, The City, and The County. I am in for about 18 months since inception for 1800 feet of road and I really don't want to start over...

Thanks for all your input. I am trying to secure a copy of their designb standards.

Velocity is dependant on volume. Since volume is unknown velocity cannot be determined.

I am doing a road design serving about 65 acers zoned office/lab. The property falls away from the road it fronts on. I designed the sanitary as a 12" to take advantage of a flatter minimum slope (0.22% rather than 0.44% for an 8")to extend sanitary as far as possible into the acerage with...