In the end I've required a switch out to 6", sticking with the known vs. the unknown. Project owner would definitely not thank us for saving a couple thousand bucks (potentially) if the sewer is clogging down the road.
For this building, peak flows would have only occurred one day per week...
I'm in the process of redesigning a sewer system for a small commercial project due to a utility conflict. Original intention was to extend a 10" public sewer main along street frontage and tap 6" service off of it for project; this has been scrubbed due to utility conflict blocking 10" main...
Thanks for the ideas. I'm with a company that I like but the benefits keep sliding down and down every year...trying to stabilize the tailspin and keep above water until the economy turns...though I may need to go join the army or something.
I work for a small engineering firm which is looking at going from a group plan to private insurance due to the ever-escalating costs of insurance and the economic slowdown.
Given that my employer-based group plan is going away, are there other industry-based groups that I can ally myself...
Thanks for all the responses! I only wish my local agencies were as responsive.
In response to RWF7437's question about bankfull capacities, I have run some simple Manning's calc's on the existing channels that show the current swales/washes to be incapable of conveying the indicated peak...
Question Background: I'm working on a rectangular parcel that is bounded on the north and west sides by existing washes. A regional drainage study (HEC-1) has defined the peak flows associated with a 24-hr, 100-yr storm for the area. The existing washes are not large enough to convey these...