Our organization is just starting to use the ORD Drainage & Utilities package for storm sewer design. We have laid out a storm sewer system and performed an analysis on the system using the software. We also used calculations in our organization's design manual to verify the software's design outputs. From that comparison we came up with the following questions and observations. All the following information is based on drainage analysis using the rational method.
Thanks so much for your help and any information is great!
To model a blocked inlet, have you tried changing the inlet type to "percent capture" and specifying zero percent?
Karl Dauber, PEAdvance ConsultingLaurens County, SCkarldauber@advconsult.netwww.advconsult.netwww.linkedin.com/in/karldauber
Hey Karl, thanks for this suggestion. I actually wasn't aware of the "percent capture" option. Changing the inlet type to percent capture did seem to work. The software wouldn't compute if I set the value to zero so I set it to 0.1, but looking at the results from the analysis it seems setting the percent capture to 0.1 still had the same result as if the inlet were completely plugged. This checks one of my questions off the list, thanks Karl!
I might suggest posting some of these questions to the OpenFlows Community since they are related to hydraulic calculations
For more information about the Road and Site design tools, visit the Road and Site design WIKI at: http://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki
Hi Tom,
There used to be a some documents called "What Happens When You Place an Inlet" and "What Happens When You Hit Compute". I don't know if they're still widely available - they're old - but I wrote them to provide details. Specifically so that you know what database fields mean and which ones are used in what calculations. while they are outdated, they're still useful in understanding the innards of how StormCAD works (a Service Ticket might get you the docs). And, yes, the OpenFlows Community is excellent about hydraulic discussions (they're quite exuberant (I often referred to Jesse D as the most helpful person at Bentley)).
WhatHappensWhenYouHitCompute.zipWhatHappensWhenYouPlaceAnInletPDFDownload.zipWhatHappensWhenYouPlaceAPipe.zip