Subject: 3 Types of Subcatchment Flow in SWMM 5
There are three types of Subcatchment flow in SWMM 5
1. Impervious area with depression storage in which the runoff from the precipitation is delayed due to the depression storage. Evaporation occurs based on the depth of water in the subarea … Read the rest
Subject: H2OMAP Sewer and InfoSewer DB Queries to find Loading Manholes
This Database Query (DB) will find all loading Manholes with a Load1 and a Load2 greater than 0. InfoSewer has up to ten possible loads in a Manhole. You can use the DB Query (Figure 1) to … Read the rest
Note: How to Set a Flap Gate in InfoSWMM
You can set a flap gate in InfoSWMM either by using the attribute browser and changing the Flap Gate Installed to Yes or No or by using the DB Editor and changing the Flag for Flap Gate Installed to Yes by … Read the rest
Subject: SWMM 5 Arrow Direction Question
A question often asked is what happens to the flow in a SWMM 5 link if the downstream and upstream node names are entered in reverse. The flow will be exactly the same as if the nodes were entered in the right order but … Read the rest
Subject: SWMM 5, H2OMap SWMM and InfoSWMM Time Step Guide
If you use a variable time step in SWMM 5 or InfoSWMM/H2OMAP SWMM it is hard to gauge the proper value of the conduit lengthening. You want to use a value that does not increase the volume of the … Read the rest
Subject: Siphon Simulation in SWMM 5 and InfoSWMM
A Siphon is simulated in SWMM 5 and InfoSWMM using the basic node and link data and downstream boundary condition:
1. Inflow can be time series, dry weather flow pattern, wet weather inflow or Subcatchment Runoff,
2. The boundary condition can be … Read the rest
Subject: Aquifers in SWMM 5
Groundwater in SWMM 5 is modeled as two zones: (1) Saturated and (2) Unstaturated. The data for the Groundwater Simulation consists of physical data in an Aquifer and elevation and flow coefficient and exponent data in the GroundwaterData. The Aquifer data object can … Read the rest
Subject: InfoSWMM Pump Summary Table
The Pump Summary Table in Report Manager tells you how often the pumps turn on (Start-Up Count), the percent of the simulation time it was used (Percent Utilized) and the maximum, minimum and average flow for the pumps.
You can also see flows in … Read the rest
Subject: How to Use Domain Manager in InfoSWMM to Reduce the Output File Size
If you want to save the output at a small report time step (2 seconds in this case) and you have a long simulation or large model then the reading of the graphicalo results may not … Read the rest
Subject: InfoSWMM Report Manager and Field Statistics
You can also use the mixed graph feature to plot the pump flow and the downstream flows on the same graph. If you click on the Report command then you can also use aField Statistics command to see the Statistics for each … Read the rest
Dry Weather Flow in InfoSWMM and H2OMap SWMM
Dry weather flow can be added to any node in H2OMAP SWMM. The dry weather flow is computed as the average flow * the monthly pattern * the daily pattern * hourly pattern * the weekend daily pattern to give the … Read the rest
Subject: How to Make a Small Model out of a Large Model in H2OMAP Sewer
The process is easy if you use Domain and Facilities.
Step 1. Use the Trace Upstream Network Command in Utilities to find the upstream network from your node of interest. The upstream network is saved … Read the rest
Subject: SWMM 5 QA and Application Manuals on the EPA Web Site
The EPA Web Site has three manuals that you can download at http://www.epa.gov/nrmrl/wswrd/wq/models/swmm/#Downloads
1. SWMM Applications Manual
2. SWMM 5 Quality Assurance Report
3. SWMM 5 Users Manual
via Blogger http://www.swmm5.net/2013/08/swmm-5-qa-and-application-manuals-on.html… Read the rest
Subject: Infiltration Data in SWMM 5
If you are using Non linear Reservoir Modeling in SWMM 5 there are
1. Five parameters for Horton Infiltration,
2. Three parameters for Green-Ampt and
3. Two parameters for CN infiltration, one parameter (conductivity) has been deprecated by the EPA in SWMM
Subject: Aquifer and Groundwater Objects in SWMM 5
There are two types of data objects in SWMM 5 to describe the Groundwater flow component. There is a Groundwater data object associated with a Subcatchment that describes flow equations, the interaction between the Subcatchment infiltration and the Groundwater component and
Subject: SWMM 5 Culvert Data from FHWA, HDS No. 5, Hydraulic Design of Highway Culverts, 1985
If you use the culvert option in later versions of SWMM 5 then when the inlet control equation flow is less than the computed St Venant flow then the FHWA equations will be used
Minimum Time Step Average Time Step Maximum Time Step
Minimum Time Step (sec) 0.984
Average Time Step (sec) 9.071
Maximum Time Step (sec) 30.000
Percent in Steady State (%) 0.000
Average Iterations per Time Step 4.821
Use a maximum time that will lower your average iterations per time step to
Subject: Elevation Interpolation from a Contour in H2OMAP SWMM
The node invert elevation or the node maximum depth can be interpolated if you use the Elevation Interpolation Tool inH2OMAP SWMM.
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Steps |
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1. Make a Contour Plot of the Node Invert Elevations. |
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2. The Created Contours are now |
Subject: How to see what you have in the various scenarios of InfoSWMM
How to see what you have in the various scenarios – a tool I use a lot is Scenario Explorer which shows you how to see thevarious datasets associated with a data set along with the … Read the rest
Subject: SWMM 5 Inlet Control Culvert Equations
The newer option for SWMM 5 culverts uses three culvert classifications and associated equations to compute the inletcontrolled flow into a culvert using the FHWA (1985) equations. The culvert code in the culvert.c code of SWMM 5 uses:
1. Two … Read the rest
