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Just want to (try to) prompt some discussion here on the recent NCHRP report "On-Bridge Stormwater Treatment Practices: A Guide". https://nap.nationalacademies.org/catalog/27904/on-bridge-stormwater-treatment-practices-a-guide Wondering if anyone has any thoughts on the...

HGL = total fluid head - velocity head = elevation head + pressure head - velocity head. Assuming a free water surface, then yes, HGL is equivalent to WSE (i.e., elevation head).

Why not just use EPA SWMM? IMO it is better suited for this detailed level of modeling (I do love HydroCAD though).

It was created by Lew Rossman (https://www.openswmm.org/Topic/32275/dstorm-a-design-storm-wizard), former lead developer of SWMM and EPANET at EPA. Regarding pump cycling, it really depends on the number and type of pump/motor(s) (and even the specific model) used and the duty schedule...

https://sites.google.com/view/dstorm When selecting a pump, make sure you consider pump run and rest (cycle) times for your design flow and sump size.

Thanks. "Today most funding for science comes through government. That means that you have to be known to be sympathetic to conclusions that are acceptable to the political classes" -Doug Casey

Thank you for the affirmation and guidance. gbam, are you suggesting that following the existing (irregular) alignment could make construction challenging?

I am working on the design to enlarge an existing trapezoidal drainage ditch (to obtain greater capacity). The current alignment of the ditch is not straight and does not have even curves. Also, the longitudinal, transverse, and side slopes vary along its length. I am restricted to expanding one...

Agreed. When I said I've often seen the design firm provide oversight/observation, its hasn't been to directly supervise the sub's operations, but rather to quickly answer questions that come up regarding the scope, coordinate access issues with the owner, provide preliminary information on the...

Do you mean that most firms aren't big enough to offer those services (e.g., survey, soils report) in-house? Or that most firms aren't big enough to subcontract out those services? If the former, yes, I understand that, but that is not what I was asking. I am wondering if it is typical for...

I am wondering what other firms’ standard practice is when obtaining outside services for site surveys and soils reports? From my experience its typical for the design firm to subcontract these services, but I am concerned about potential liability my firm could be exposing itself to when hiring...