Studio Express calculates everything you need, when you need it. Open channels, Pipes, Weirs, Orifices, HEC-22 Inlets, NRCS, Rational, Modified Rational Hydrographs, Detention Pond Sizing and more.
On-grade inlet efficiency calculations may not be quantum physics but are fairly involved. I usually prefer to write my own code or use a spreadsheet. But I couldn't improve on Studio Express. It works the way I would have done it myself.
Thanks for a fantastic product that delivers great results.