Ref: https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/108144/demand-per-unit-length-of-pipe-allocation-in-watergems-watercad--discussion
Hello and thanks for your response. Actually I want to use this method in sewergems in order to allocate sanitary loading. formerly I used load builder and shape files to distribute flow but I couldn't incorporate extreme flow factors in my models since it gave me fixed pattern flow. I thought the next alternative would be allocating load per pipe length and then give it to manholes. I tried to to apply your method but I have two problems leaving me with no favorable result.
1-In the model builder wizard I choose as shown in the picture( start node as the key field, manhole>collection>sanitary loading as the table type. and in the below table I was not sure what to chose so I went for base flow as property. After being done with modelbuilder I went to check manhole properties in inflow( sanitary loading). but after opening it show the loads as hydrograph with empty boxes!!!!
2- Aside from what I said , If I do the same procedure with stop node it will override the first one. It wont have 2 collections or maybe I'm doing it wrong?!
I'd really appreciate it if you help me with this.
Maryam Mohamadizad said:I used load builder and shape files to distribute flow but I couldn't incorporate extreme flow factors in my models since it gave me fixed pattern flow.
You can find a workaround for this in the following wiki article: Using Unit Loads and Extreme Flow Factors after a LoadBuilder run
Maryam Mohamadizad said:1-In the model builder wizard I choose as shown in the picture( start node as the key field, manhole>collection>sanitary loading as the table type. and in the below table I was not sure what to chose so I went for base flow as property. After being done with modelbuilder I went to check manhole properties in inflow( sanitary loading). but after opening it show the loads as hydrograph with empty boxes!!!!
This is because you must map the sanitary load type when using this method, or it will import as the default type of hydrograph. The correct workflow and options are documented in the following wiki article: Importing Loading Information Using ModelBuilder
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Answer Verified By: Sushma Choure
Also, just to clarify - unit loads with extreme flow factors are used with the GVF-Convex solver in SewerGEMS and SewerCAD, to perform a steady state simulation of "peaked" worst-case conditions. Typically this is done with the automated design feature to size pipes. If this is indeed what you are trying to do, be sure to select the GVF-Convex solver in your calculation options.
If you intend to use one of the dynamic solvers (Implicit or Explicit) for a time-based (unsteady) simulation, the peaking factors will not apply, and you would normally import the loads with LoadBuilder (as pattern-based), and assign an appropriate pattern to represent the change in load over the course of the simulation duration.
See: Differences between solvers: GVF-Convex vs. GVF-Rational vs. Implicit vs. Explicit (SWMM)