How to set an internal boundary condition in SWMM 5, InfoSWMM and H2OMap SWMM

How to set an internal boundary condition in SWMM 5, InfoSWMM and H2OMap SWMM

1. Make the internal boundary node a storage node
2. Set the Storage node initial depth
3. Give it a large storage area
4. Set the offset depth of the link below the storage node to the Storage Node initial depth
5. The Node depth will be at the initial depth at the start of the simulation

                Internal Boundary Node in SWMM 5 at a fixed depth.

d/D, q/Q for a Link in SWMM 5, InfoSWMM and H2oMap SWMM

d/D, q/Q for a Link in SWMM 5, InfoSWMM and H2oMap SWMM

How do we look at the various measures of "fullness" in a pipe of link in SWMM 5?  Here we look at some graphs from InfoSWMM.

d/D is the pipe depth over the full depth of the link
q/Q is the current link flow over Qfull for the link (Q full is the full flow of a link based on Manning's equation)  This Qfull is based on the bed slope of the link.   You can have a q/Q or q/Qfull greater than 1 if the water surface slope is greater than the bed slope of a link.  This is especially true for flat links where SWMM 5 has a minimum slope of 0.001

The image shown below shoes that at the peak flow in the links is greater than 1 even though the pipe is not full (d/D less than 1) for this model of flat slopes.  Qfull is a comparison metric and not the result of the simulation.  

d/D, q/Q for a Link in SWMM 5, InfoSWMM and H2oMap SWMM

How RTC Rules are Set in SWMM5, InfoSWMM and H2OMAP SWMM

Subject:   How RTC Rules are Set in SWMM5, InfoSWMM and H2OMAP SWMM