Day: August 5, 2013

Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow

Subject:  Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow
You can model Force Main friction loss in InfoSWMM using either Darcy Weisbach or Hazen Williams as the full pipe friction loss method (see Figure 1 for the internal definition of full flow).   A function
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Example Groundwater Model in SWMM 5

Subject:   Example Groundwater Model in SWMM 5


The attached model shows three ways in which the groundwater model of the SWMM 5 subcatchments interact with the node depths of the hydraulic network.  The hydraulic network interaction can be either:


1.       At a fixed water surface elevation,

2.       At a time

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Example SWMM 5 Snowmelt Model

Subject: Example SWMM 5 Snowmelt Model


Attached is a simple sample snowmelt model in SWMM 5 that has built in snowfall and temperature in a one subcatcment model with snowmelt.   You define the separation of precipitation into snowfall and rainfall by setting a base temperature in the Snow Pack Editor.  

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SWMM 5 Leaping Weir Example

Subject:  SWMM 5 Leaping Weir Example


The attached example shows one way how SWMM 5 RTC Rules can be used to have the low flow go down a leaping weir orifice and the high flow go over the weir to the downstream section of the sewer. 


via Blogger the rest

SWMM 5 Precipitation Options

Subject:  SWMM 5 Precipitation Options


You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative precipitation, use both rainfall and snowfall in the same rain gage depending on temperature, use both time series or external files for Read the rest

How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5?

Subject:   How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5?


An explanation of the four StVenant Terms in SWMM 5 and how they change for Gravity Mains and Force Mains. The HGL is the water surface elevation in the upstream Read the rest

Link Iterations in the SWMM 5 Dynamic Wave Solution

Subject:   Link Iterations in the SWMM 5 Dynamic Wave Solution


Each of the links in the SWMM 5 network can use up to 8 iterations to reach convergence during a time step in the dynamic wave solution of SWMM 5.  The rules governing the number of iterations are:


1.       Read the rest

Runoff Routing Options Example in SWMM 5

Subject:   Runoff Routing Options Example in SWMM 5

 There are six options for runoff routing in SWMM 5:

 ·         All Runoff to an Outlet Node

·         All Runoff to another Subcatchment

·         All Runoff to the Pervious Area of the Subcatchment or other Subcatchment

·         All Runoff to the Impervious

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Create Watersheds Using InfoSWMM Subcatchment Manager

Subject:  Create Watersheds Using InfoSWMM Subcatchment Manager

 The Subcatchment Manager of InfoSWMM will  help calculate most of the  physical parameters associated with a Watershed or Subcatchment in SWMM 5 from a Digital Elevation Data (Step 1).  The Subcatchments area created from a Flow Direction Raster (Step 2) and a Flow

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Three Flow Divider Link Example in SWMM 5

Subject:  Three Flow Divider Link Example in SWMM 5

 You can have more than 2 downstream OUTLET Type links in the SWMM 5 dynamic wave solution.  Each link, Under5, Over5 and ReturnFlow is an OUTLET Link with a rating curve depth/flow table.  Depending on the depth in the storage node

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Output Statstics Manager to find negative flows in InfoSWMM

ubject:  Output Statstics Manager to find negative flows in InfoSWMM


Output Statstics Manager to find negative flows with these parameters:


1.       Pipe Features

2.       Use a Domain with your force mains

3.       Select Flow

4.       Event Dependent

5.       Total – NOT Mean or Peak to  find the negative and

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Drawing features to show multiple attributes in InfoSWMM and InfoSewer

Subject:   Drawing features to show multiple attributes in InfoSWMM


Your network data usually has a number of different attributes that describe the features it represents (Figure 3). While you’ll commonly use one of the attributes to symbolize the

data—for example, showing one quantity in the InfoSWMM Map Display —you may Read the rest

Flow Dividers in SWMM 5 Dynamic Routing

Note:  Flow Dividers in SWMM 5 Dynamic Routing

 You can  have flow dividers in SWMM 5 dynamic routing by using Storage Nodes for the dividers, OUTLET links for the downstream links and minimizing downstream HGL effects. The needed components are:

 1.   A Storage Node for the divider node as a

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The Keep and Dampen options and their effect on the four main terms of the St Venant equation in SWMM5

Note:  The Keep and Dampen options and their effect on the four main terms of the St Venant equation


The four terms are are used in the new flow for a time step of Qnew:


Qnew = (Qold – dq2 + dq3 + dq4) / ( 1 + dq1)Read the rest

Surcharged Node and the Link Connection in SWMM 5

Subject:   Surcharged Node and the Link Connection in SWMM 5


surcharged node in SWMM 5 uses this point iteration equation (Figure 1):


dY/dt = dQ / The sum of the Connecting Link values of  dQ/dH


where Y is the depth in the node, dt is the time step, Read the rest

How to Divide the Inflow at a Node in InfoSWMM

Subject:  How to Divide the Inflow at a Node in InfoSWMM


In SWMM 5 only the Kinematic Wave solution allows a flow divider at a node to divide the Inflow to node to two  downstream  links, but you can use the Inflow/Outflow Outlet type in InfoSWMM to divide the Read the rest

Example SWMM 5 Model for Activated Sludge

Note:   Example SWMM 5 Model for Activated Sludge

Here is one example of how to model an activated sludge tank.  The image is Wikipedia (  and is the watermark background in the SWMM 5 GUI.  There is 100 lps inflow, 20 percent recycle and 10 percent sludge
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How to Make Icons and Expand the Toolbars in InfoSWMM and InfoSewer

Subject:  How to Make Icons and Expand the Toolbars in InfoSWMM and InfoSewer
You can customize the toolbars in InfoSWMM and InfoSewer by clicking on Customize and performing 4 steps:
Step 1.  Click on Customize
Step 2.  Move the tool from the Command list to the toolbar.
Step 3.  Change the Button
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