InfoSWMM Pump Summary Table and Force Main Rules updated for 2018

Introduction: InfoSWMM for ArcGIS (Esri, Redlands, CA). InfoSWMM  enables engineers to work more efficiently and reliably with very large and complex network models, thanks to improvements in such areas as built-in 64-bit simulation, enhanced water quality modeling, and batch run scenario management using many of the Arc Map tools developed for InfoWater and InfoSewer.. All operations of a typical sewer system — from analysis and design to management functions such as water quality assessment, pollution prediction, sediment transport and deposition, urban flooding, real-time control, and record keeping — are addressed in a single, fully integrated geoengineering environment. The program’s powerful hydraulic and water quality computational engine is based on the current SWMM 5 version, which is endorsed by the USEPA and certified by FEMA.

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 (Figure 1).

Figure 1. Pump Summary Table in the Output Report Manager, shows pump starts, time below, on and above the Pump Curve.

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 (Figure 2).

Figure 2. 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(Figure 3).

Figure 3 . HGL Plot by altering the stepping time in Graph Settings.

Figure 3 . HGL Plot by altering the stepping time in Graph Settings.

The basic force main system consists of (Figure 4):

  1.          Wet Well and its associated physical parameters,
  2.          Pump Type
  3.          Defined Pump Curve,
  4.          Downstream Pressure Node and
  5.          Downstream Force Main
Figure 1:  The Basic System

Figure 4:  The Basic Force Main System

Here are a few common steps in making a force main system.

Step 1:  Wet Well Data

Enter the invert elevation, maximum depth of the Wet Well, the physical shape as either a function or shape table and any evaporation or infiltration (Figure 5).

Figure 6. XXX

Figure 5. Wet Well Data

Step 2:  Define the Pump Type (Figure 6)

The pump type is defined by a Pump Curve and the On and Off elevations:

The four types of pumps are:

  1.          Volume – Flow
  2.          Depth – Flow
  3.          Head – Flow
  4.          Depth – Flow
 Define the Pump Type

Figure 6.  Define the Pump Type

Step 3:  Define the Pump Curve in the Operation Tab (Figure 7)

Figure 6. Define the Pump Type

Figure 7. Define the Pump Curve

Step 4:  Set a Surcharge or Pressure Depth at the Downstream end of the Pump (Figure 8)

Any positive Surcharge Depth in the Node will allow the program during the simulation to keep the node under pressure forcing flow through the Force Main.   This is similar  to a sealed manhole in InfoWorks ICM.

Figure 8. FM Nodes should use a Surcharge Depth.

Figure 8. FM Nodes should use a Surcharge Depth.

Step 5:  Force Main Data (Figure 9)

Define the downstream pipe(s) from the pump as Force Main conduits with either a Hazen Williams or Darcy-Weisbach coefficient  (defined in the the Run Manager of InfoSWMM or H20Map SWMM,  Figure 10).

Figure 9. FM Nodes should use a Surcharge Depth.

Figure 9. FM Links should use DW or HW depending on Run Manager Options.

Figure 6. XXX

Figure 10. Run Manager HW or DW options.

Step 6: HGL Plot of the Force Main System with Advanced Labeling (Figure 11)

Figure 6. XXX

Figure 11.   HGL with Advanced Labeling

Step 7:  Pump Operation Curve over time in the Output Report Manager (Figure 12)

Figure 6. XXX

Figure 12. Pump Operation Curve over time in the Output Report Manager

There are five ways to model a force main in InfoSWMM  or H2OMap SWMM for the combination of full and partial flow in the force main (Figure 15).  The InfoSWMM St Venant solution involves three computational points in  the Link/Node system  (Figures 13, 14 and 15).

  1. Full Flow using Darcy-Weisbach for the friction loss
  2. Full Flow using Hazen-Williams for the friction loss
  3. Full Flow using Manning’s n for the friction loss
  4. Partial Flow uses Manning’s n for the friction loss for ForceMain Equation options
  5. All non FM  or Gravity Main pipes use  Manning’s Equation.
Figure 14. Three computational points in the Link/Node system.

Figure 13. Three computational points in the Link/Node system.

Figure 14. St Venant Equations in InfoSWMM

Figure 14. St Venant Equations in InfoSWMM

Figure 15. FM and GM Alternatives

Figure 15. FM and GM Alternatives

If you use Darcy-Weisbach or Hazen-Williams then an equivalent Manning’s n for a force main that results in the same normal flow value for a force main flowing full under fully turbulent conditions is calculated internally in InfoSWMM  (Figure 16).

  • Equivalent n for H-W is 1.067 / Hazen-Williams Coefficient  * (Full Depth / Bed Slope) ^ 0.04
  • Equivalent n for D-W is (Darcy-Weisbach friction factor/185) * (Full Depth) ^ 1/6
Figure 16. FM and GM HeadLoss Equations

Figure 16. FM and GM HeadLoss Equations

A few blogs on Force Mains and Pumps in InfoSWMM and InfoSewer:

 

The all-important Break Node

https://swmm5.org/2015/02/08/how-to-make-a-break-node-in-swmm5-and-infoswmm-for-force-mains/

Basic Rules

https://swmm5.org/2015/02/07/pump-and-force-main-system-in-infoswmm/

https://swmm5.org/2013/07/28/pump-force-main-system-in-infoswmm-and-swmm-5/

https://swmm5.org/2016/09/15/a-visual-look-at-a-series-of-hw-force-mains-in-infoswmm-and-swmm5/

https://swmm5.org/2013/12/26/rules-for-force-mains-in-infosewer-and-h2omap-sewer/

https://swmm5.org/2016/09/04/pumps-in-infosewer-and-h20map-sewer/

https://swmm5.org/2018/04/08/how-to-force-swmm5-to-use-only-the-wet-well-area-for-a-pump/

Siphons

https://swmm5.org/2013/08/10/siphon-simulation-in-swmm-5-and-infoswmm/

https://swmm5.org/2016/09/05/siphon-modeling-in-infosewer-and-arc-map/

Hazen Williams

https://swmm5.org/2013/10/06/hazen-williams-and-force-mains-in-swmm-5/

Force Mains

https://swmm5.org/2013/08/09/what-are-the-types-of-force-mains-fm-in-swmm-5/

https://swmm5.org/2013/08/04/comparison-of-the-h2omap-swmm5-hazen-williams-force-main-solution-to-a-hw-solution/

https://swmm5.org/2015/02/08/advanced-force-main-solution-and-gravity-main-attenuation-in-infosewer-for-better-pump-force-main-gravity-main-simulations/

Theory behind FM Transitions

https://swmm5.org/2013/08/05/force-main-friction-loss-in-infoswmm-and-the-transition-from-partial-to-full-flow/

Pump Summary Table

https://swmm5.org/2013/08/10/infoswmm-pump-summary-table/

RTC Rules

https://swmm5.org/2016/09/26/setting-controls-for-the-pump-and-orifice-in-infoswmm-and-swmm5/

https://swmm5.org/2013/08/03/how-to-see-the-effect-of-the-pump-setting-in-the-rtc-rules-of-infoswmm-and-h20map-swmm/

https://swmm5.org/2016/09/05/real-time-control-rtc-rule-editor-in-infoswmm-for-swmm5-control-rules/

https://swmm5.org/2016/05/14/annotated-pid-controller-in-swmm5-and-infoswmm/

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    About Robert Dickinson

    Robert Dickinson is a Product Sector Leader with Innovyze in the USA for InfoSewer, InfoSWMM and H2OMAP SWMM. He has over 42+ years experience in modeling the key hydrologic, water quality and hydraulic processes involved in urban and surburban drainage design and analysis. He has been very lucky to work with many talented engineers and scientists in his professional life at the University of Florida, XP Software, CDMSmith, the US EPA and at Innovyze Inc which allows him to offer worldwide support, training and sales/adaptation help for the Innovyze Products InfoSWMM, InfoSewer, InfoSWMM 2D, H20Map SWMM, SWMMLive and SWMM features in ICM and ICM SE. Short Time History: Product Sector Leader with @Innovyze for InfoSWMM / InfoSewer, 46+ years w/ SWMM3/4/5 11+ Years w/ @Innovyze! 8+ years @CDMSmith 9 years w/ XPSWMM 17 years @UF Very long bio - https://www.linkedin.com/pulse/my-history-various-versions-swmm-swmm3-swmm4-swmm5-robert-dickinson?trk=prof-post
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