I am using civil storm for the first time to try and model an actual rain event that occurred and testing the existing conditions of my storm water system. I was able to get 24 hour data from the airport data in five minute increments. I went into Storm data and I created a new time-depth storm. Within the Storm Event Input I created a "New Return Event". In here I set up the settings to be a 25 year return event, changed the depth type to incremental, and then entered the start time, increment, and end time. From there I entered in the depths recorded. I then created an alternative for the date that this rain occurred and then selected this rain event under global storm data. I then created a scenario for this rain event. I tried to compute the model and I get the error code "44000 "July 6th" "(N/A)" "-1" "(N/A)" (N/A) "The global storm event is not selected, the selected storm event does not exist or the storm event is not an IDF storm event. To select a storm, go to Components - Global Storm Events. To create a storm event, go to Components - Storm Data." Hydraulic Results" I am curious to know what is going wrong or if anyone would have any hints as to where I went wrong. Thank you!
Aaron Passow
Hi Aaron,
The Time-Depth series data can be used as a global storm event when you have "Unit Hydrograph" as you runoff method. In the catchment you defined check the runoff method. Also check your Numerical Solver employed for calculation by going to Calculation Options > Base Calculation Options > Active Numerical Solver. If it is set to GVF-Rational, it will only compute by the Rational and Modified Rational Methods for runoff estimation. In these methods the "Intensity Duration Frequency (IDF)" curves are used as global storm event, so your time depth series data won't be recognized as a global storm if GVF-Rational Solver is selected.
If you have to use time depth data, use the "Implicit Solver" and use "Unit Hydrograph" method to define your global storm.
The following article will help you distinguish between the different numerical solvers.
Differences between solvers: GVF-Convex vs. GVF-Rational vs. Implicit vs. Explicit (SWMM)
Hope this helps.
Regards,
Yashodhan Joshi
Just to add to Yashodhan's response - if you are trying to use the GVF-Rational numerical solver but you only have time-depth information for your catchments (which are not compatible as Yashodhan said), please see this related article from our Wiki:
Using SCS or other hydrograph method in StormCAD (GVF Rational solver)
If you are trying to use the Implicit or Explicit (SWMM) solvers to route a hydrograph based on the rational method, you will need to use the Modified Rational Method for your catchments, with an IDF storm event.
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.