SWMM5, InfoSWMM

Subject: How to Set Up an InfoSWMM 2D Simulation Polygon and Mesh

 Step 1: Create the 2D Database

Step 2: Verify the Creation of the 2D Database

Step 3: Create the background Simulation Polygon for the 2D simulation

Step 4: Create the Mesh on the 2D Simulation Polygon

Step 5: Run the combination 1D and 2D network

Step 6: Simulating the network uses up to the number of cores on your computer for the 2D flow.

Step 7: 2D plot of the flooded mesh points.

Subject:  Drainage Wells or a Vertical Exfiltration Trench in InfoSWMM

Note, this is just one way to model an Exfiltration Trench.  The source for the image below is Rice Creek Watershed. 

You can make a storage node to simulate the trench with the following characteristics:

·         Functional or Shape Curve to describe the shape of the trench,

·         Infiltration parameters to simulate the infiltration flow out of the bottom or sides of the trench,

Step 1:  Define the shape and geometrical characteristics of the Infiltration Trench

Step 2: Define the soil infiltration characteristics of the trench

Step 3:  Run the simulation.  The Storage Volume Summary tells you the volume infiltrated and the average outflow.

Step 4:  Output Manager will also show the infiltration  outflow, the depth and the volume of the infiltration/storage node.

Step 5:    Infiltration losses out the side and bottom of the orifice.

Subject: Weirs in InfoSWMM

 Figure 1 shows the relationship between the weir input data and the upstream and  downstream nodes.

·         Height,

·         Crest and

·         Node Invert Elevation

 There are four types of weirs and if the weir becomes submerged downstream the Villemonte weir submergence correction is applied (Figure 2).  You can have flow reversal across the weir unless you use a Flap Gate for the weir (Figure 3). 

Figure 1:  Definition of Weir Terms

Figure 2: Villemonte Weir Submergence Correction

Figure 3:  Flow Reversal in a Weir