InfoSWMM Pump Operation Curve and Time Off Curve

Subject: InfoSWMM Pump Operation Curve and Time Off Curve

The InfoSWMM pump operation curve will show you over time the relationship between the head of the pump and the pump flow. The pump summary table will also tell you how often the pump head was higher than the High Head of the Curve and how often the pump head was lower than the Low Head of the Curve. If you replay the animation the purple square will move up and down the pump curve.

Dry Weather Flow in SWMM 5

Subject:   Dry Weather Flow in SWMM 5

Dry Weather Flow in InfoSWMM and H2OMap SWMM by dickinsonre 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 Dry Weather Flow at any time step (Figure 1).   Since the four types of patterns (Figure 2) are all multiplied together then for Saturday and Sunday the hourly pattern and the weekend hourly pattern will both be used.   This will have the effect of overestimating the flow if the multipliers are greater than 1 and underestimating theflow if the multipliers are less than one.  You should enter the  Pattern X for the Weekend Hourly Pattern in H2OMAP SWMM  where  X  = Weekend Hourly Pattern / Hourly Pattern  So that when the pattern X is multiplied by the Hourly Pattern the program will use the intended Weekend Pattern.  Figure 1.  How Dry Weather Flow is Computed in H2OMAP SWMM Figure 2.  The Four Types of Time Patterns in H2OMAP SWMM, InfoSWMM and SWMM 5  via Blogger http://www.swmm5.net/2013/08/dry-weather-flow-in-infoswmm-and-h2omap_10.html

InfoSWMM Report Manager and Field Statistics

Subject:  InfoSWMM Report Manager and Field Statistics

InfoSWMM Report Manager and Field Statistics by dickinsonre 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 Link and Pump.   The right mouse button for the Report also allows you to make a scatter plot and graph the flows in theforcemains versus the flows in the pumps.     via Blogger http://www.swmm5.net/2013/08/infoswmm-report-manager-and-field.html

How to use the Report Feature of the HGL Plot in InfoSWMM

Subject:   How to use the Report Feature of the HGL Plot in InfoSWMM

How to use the Report Feature of the HGL Plot in InfoSWMM by dickinsonre Subject:   How to use the Report Feature of the HGL Plot in InfoSWMM The report feature of the HGL plot helps you understand in more detail the pump flows, forcemain flows and node heads. Step 1. Load the Domain in the HGL Plot using Report Manager Step 2. Click on the Report Command to Show the HGL Data in Tabular Format Step 3.  Format the Results Table from the HGL Plot to see the data better. Step 4.  Now we have the heads, flows and velocities for the pumps, nodes and force main links in our Domain around the pump of interest at time steps of 2 seconds,  We can now see how the flows, heads and velocities change downstream from the pump. Step 5.  Force Mains, Nodes and Pumps in our Table Step 6.  The pump turns on and the flow moves downstream to the force mains – the heads in the nodes increase to balance the flow at each node.  As you can see there is a 1 to 2 GPM decrease due to attenuation as the flow from the pump moves into the force mains. Step 7.  The pump turns off and flows downstream decrease.  You can get negative flow if the downstream head is higher than the upstream head of the link. Step 8.  Use Advanced Labeling and the HGL Plot Stepping Interval to see all of the data in your Plot. via Blogger http://www.swmm5.net/2013/08/how-to-use-report-feature-of-hgl-plot.html

How to Use Domain Manager in InfoSWMM to Reduce the Output File Size

Subject:   How to Use Domain Manager in InfoSWMM to Reduce the Output File Size

How to Use Domain Manager in InfoSWMM to Reduce the Output File Size by dickinsonre 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 be as speedy as you want.  You can save ONLY the DOMAIN to the output binary file however to make this smaller and faster to react. Step 1.  Define your Reporting Time Step and Your Routing Time Step.  In this case we are routing at 1 second but saving the DOMAIN results every 2 seconds. Step 2.  Clear your existing DOMAIN and Create a DOMAIN based on the area you are most interested in during the simulation. Step 3.  Use the Advanced Tab in Run Manager and select Domain as the Output Scope – this will save only the Domain to the output binary file. Step 4.  Run the simulation using Run Manager and then look at the output.  You are restricted to 8800 graph points but the number of points in the Report Table is unlimited. Step 5. You can use the Data Plot Option (right mouse click) to see a subset of the larger than 8800 data points.   via Blogger http://www.swmm5.net/2013/08/how-to-use-domain-manager-in-infoswmm.html

 

InfoSWMM and H2OMAP SWMM Pump Summary Table

Subject:   InfoSWMM and H2OMAP SWMM  Pump Summary Table

InfoSWMM Pump Summary Table by dickinsonre 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 the downstream links from the pumps in the force mains along with the pumps.   If you use the Mixed Graph Control you see the Pump flows and Link Flows on the same Graph You can control the replay of the HGL Plot by altering the stepping time in Graph Settings via Blogger http://www.swmm5.net/2013/08/infoswmm-pump-summary-table.html

How to Set Up Hot Start Files in InfoSWMM for a Fixed Boundary Outfall

Subject:  How to Set Up Hot Start Files in InfoSWMM for a Fixed Boundary Outfall

How to Set Up Hot Start Files in InfoSWMM for a Fixed Boundary Outfall by dickinsonre Subject:  How to Set Up Hot Start Files in InfoSWMM for a Fixed Boundary Outfall If you have a fixed boundary outfall condition in your model and want to prevent reverse flow when you run your simulation the best way is to use the Hot Start files to fill up the links and nodes at the start of the simulation. 1st Step:  Turn off the DWF inflow so that ONLY the flow from outfall enters the network.  Use the Process Models in Run Manager to turn off and turn on the Dry Weather flow. 2nd Step:  Run the simulation first SAVING a Hot Start File using zero initial node depths and link flows. 3rd Step:  Save and Use Hot Start Files until the initial and final volume in your Network stays the same.  4th Step:  Check the Initial and Final Stored Volume in the output text file 5th Step:  Check to see if you nodes are stable by using a Junction Group Graph 6th Step:  Now Run the Simulation with flows turned an and the network will start out with the Boundary Condition depths and stable flows via Blogger http://www.swmm5.net/2013/08/how-to-set-up-hot-start-files-in.html

How to Set a Flap Gate in InfoSWMM

Note:  How to Set a Flap Gate in InfoSWMM

How to Set a Flap Gate in InfoSWMM by dickinsonre 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 using the Block Edit tool.   The DB method is better for changing many conduits.  via Blogger http://www.swmm5.net/2013/08/how-to-set-flap-gate-in-infoswmm.html

H2OMAP Sewer and InfoSewer DB Queries to find Loading Manholes

Subject:   H2OMAP Sewer and InfoSewer DB Queries to find Loading Manholes

H2OMAP Sewer and InfoSewer DB Queries to find Loading Manholes by dickinsonre 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 create a Query Report to show all of the Manholes with a non zero loading for both Load1 and Load2.  New Queries can be made to show any combination of the ten Manhole Loadings either by altering the DB Query or creating a new DB Query. Figure 1. DB Query to find Manholes with Load1 and Load2 greater than 0.0  Figure 2.  Query Report for the DB Query  via Blogger http://www.swmm5.net/2013/08/h2omap-sewer-and-infosewer-db-queries.html

How to Model a Vacuum Sewer in SWMM 5

Subject:  How to Model a Vacuum Sewer in SWMM 5  

You can model a vacuum sewer as a gravity pipe connected to a storage node connected to an outlet connected to various pipes in a sawtooth pattern connected to a collection tank with a pump that pumps to a force main.

1.       Gravity Pipe,

2.       Storage Node,

3.       An Outlet function that works as a function of the depth in the storage node

4.       Series of Pipes in a Sawtooth Pattern,

5.       Collection tank,

6.       Pump

7.       Force Main

http://www.sivacvacuumsewer.com/index03.html

Vacuum Sewer Example

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

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

SWMM 5 Arrow Direction Question

Subject:   SWMM 5 Arrow Direction Question

SWMM 5 Arrow Direction Question by dickinsonre 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 the flow in the link will be negative.  As long as the inflow to the model is at the same node in both alternate models the node depth, the link upstream depths and upstream cross sectional areas will be the same.  For example, the flow out of Nodes 80408A and 80408 will be the same but the flow out of 80408 will be negative and the flow out of 80408A will be positive. via Blogger http://www.swmm5.net/2013/08/swmm-5-arrow-direction-question.html

SWMM 5 and InfoSWMM Time Step Guide

Subject:   SWMM 5 and InfoSWMM Time Step Guide

SWMM 5, H2OMap SWMM and InfoSWMM Time Step Guide by dickinsonre 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 network yet does increase the length of the shortest links so you can use a longer time step.  A good approximation to the time step that you want to use is shown in the image.   The Time Step Guide in seconds is Link Length / [Velocity + sqrt(g*Maximum Depth)] with the assumption that the velocity at maximum depth is about the value of the wave celerity for closed links or sqrt(g*Maximum Depth).  Normally (unless pumps are involved) the average time step used during the simulation is a good gauge of the time to use for the simulation.  For example, in this model run the time step used is 13 seconds which is about the conduit lengthening time step of 20 seconds * adjustment factor of 0.75 via Blogger http://www.swmm5.net/2013/08/swmm-5-h2omap-swmm-and-infoswmm-time.html