Hierarchy of Your Network in InfoSWMM and H2OMAP SWMM

Subject: Hierarchy of Your Network in InfoSWMM and H2OMAP SWMM

In both InfoSWMM and H2OMAP SWMM you can run a subset of the network by using the Facility Manager to make part of the network inactive and not solved.  You can make the output files smaller if you are performing a continuous simulation and save only the results of All, the Domain Only or a Selection Set to the graphical output file (Figure 1).   Figure 2 shows a few ways to query, view, graph and perform statistics for the model run.

Figure 1.  Options for saving the Active Network Data to the Graphical Output Data Set.

Figure 2.  Output View, Query and Graphical Options.

Import of Sections from SWMM 5 into InfoSWMM and H2oMAP SWMM

Subject:   Import of Sections from SWMM 5 into InfoSWMM and H2oMAP SWMM

A very useful hidden feature of the import SWMM 5 to InfoSWMM and H2OMAP SWMM is the ability to import all of the data or just one section.  For example, you can import the LID data, DWF patterns, control rules, pollutants, transects and other data that is transferable between different networks.

SWMM 5 Loss Term Values for various velocities

Subject:   SWMM 5 Loss Term Values for various velocities and K values

SWMM 5 has three loss terms available for each link:  Entrance, Exit and Other losses.  The Entrance loss uses the upstream link velocity, the  Other loss uses the center link velocity and the Exit loss uses the downstream link velocity.  The general form of the loss term in the St. Venant equation is K*V^2/2g Table 1 shows the loss in feet of head for various combinations of velocity and K value.  If you want to  simulate a little loss of head at each node then a small value of K should be used otherwise the cumulative loss in the whole networks will be many feet of head.

  Loss Term units equals K * V^2/2g = ft/sec * ft/sec * sec^2/ft = ft

Table 1:  Loss in feet of head for various combinations of velocity and K values.

Velocity (ft/sec)

K

K

K

K

K

K
 

0.050

0.100

0.250

0.500

0.750

1.000

1

0.001

0.002

0.004

0.008

0.012

0.016

2

0.003

0.006

0.016

0.031

0.047

0.062

3

0.007

0.014

0.035

0.070

0.105

0.140

4

0.012

0.025

0.062

0.124

0.186

0.248

5

0.019

0.039

0.097

0.194

0.291

0.388

6

0.028

0.056

0.140

0.280

0.419

0.559

7

0.038

0.076

0.190

0.380

0.571

0.761

8

0.050

0.099

0.248

0.497

0.745

0.994

8

0.050

0.099

0.248

0.497

0.745

0.994

9

0.063

0.126

0.314

0.629

0.943

1.258

10

0.078

0.155

0.388

0.776

1.165

1.553

SWMM 5 Inlet Control Culvert Equations

Subject:   SWMM 5 Inlet Control Culvert Equations

The newer option for SWMM 5 culverts uses three culvert classifications and associated equations to compute the inlet controlled flow into a culvert using the FHWA (1985) equations.  The culvert code in the culvert.c code of SWMM 5 uses:

1.   Two Equations for Unsubmerged culvert flow,

2.   One Equation for the Transition flow, and

3.   One Equation for Submerged flow.