Month: August 2013

The Link Time Step in SWMM 5, InfoSWMM and H2OMap SWMM

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

InfoSWMM Error Messages and Arc Map Invalid Characters

InfoSWMM Error Messages and Arc Map Invalid Characters A few other invalid characters are shown here in addition to the space character.  The Arc Map Link is http://www.esri.com/news/arcuser/1010/joinvalidate.htmlif you want more information. […]

UK Environment Agency Study Confirms Leading Capabilities of InfoWorks ICM

Press Room | Products | News | Events | The Company   UK Environment Agency Study Confirms Leading Capabilities of InfoWorks ICM Innovyze Smart Integrated Catchment Solution Excels in Examination of Two-Dimensional Modeling Solutions Broomfield, Colorado, USA, August 20, 2013 — Innovyze, a […]

Vacuum Sewers

Vacuum Sewers Compiled by: Beat Stauffer (seecon international gmbh) Source:  http://www.sswm.info/category/implementation-tools/wastewater-collection/hardware/sewers/vacuum-sewers Executive Summary Vacuum sewerage systems consist of a vacuum station, where the vacuum is generated, the vacuum pipeline system, collection chambers […]

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   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 […]

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 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 […]

3 Types of Subcatchment Flow in SWMM 5

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 […]

H2OMAP Sewer and InfoSewer DB Queries to find Loading Manholes

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 […]

How to Set a Flap Gate in InfoSWMM

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 […]

SWMM 5, H2OMap SWMM and InfoSWMM Time Step Guide

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 […]

Siphon Simulation in SWMM 5 and InfoSWMM

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 […]

Aquifers in SWMM 5

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 […]

InfoSWMM Pump Summary Table

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 […]

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   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 […]

InfoSWMM Report Manager and Field Statistics

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 […]

Dry Weather Flow in InfoSWMM and H2OMap SWMM

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 […]

How to Make a Small Model out of a Large Model in H2OMAP Sewer and InfoSewer

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 […]

SWMM 5 QA and Application Manuals on the EPA Web Site

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

Infiltration Data in SWMM 5

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 […]

Aquifer and Groundwater Objects in SWMM 5

  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 an Aquifer data […]

Three Hidden Secrets to Speeding up your SWMM 5, H2OMAP SWMM or InfoSWMM Model

   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 […]

Elevation Interpolation from a Contour in H2OMAP SWMM

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.   Steps Action 1.   Make a Contour Plot of the Node Invert Elevations. 2.   The Created Contours are […]

How to see what you have in the various scenarios of InfoSWMM

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 relationship between the Base and Various Child Scenarios.     […]

SWMM 5 Inlet Control Culvert Equations

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 Equations for Unsubmerged culvert flow, 2.   One Equation for the Transition flow, and 3.   One Equation […]

How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5?

Subject:   How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5?   This graph shows the values of the internal SWMM 5 parameters for Green Ampt Infiltration for the pervious […]

High and Low Estimates of ICM Subcatchment Dimension for SWMM Hydrology

High and Low Estimates of ICM Subcatchment Dimension for SWMM Hydrology   These are the estimates for both SWMM 5, InfoSWMM and ICM SWMM Hydrology, the low estimate is 0.2*SQRT(Area in Feet) and the High Estimate is 5*SQRT(Area in Feet), Figure 1.  You can use higher or lower numbers to calibrate to monitored […]

How are Flooded Time, Surcharged Time and Flooded Volume Calculated in InfoSWMM and H2OMAP SWMM?

How are Flooded Time, Surcharged Time and Flooded Volume Calculated in InfoSWMM and H2OMAP SWMM?   The time, volume and flooded rate shown in the InfoSWMM and H2OMAP SWMM Report File Node Flooding Summary (Figure 2) are calculated as follows (Figure 1):   For […]

Inflow Time Series in InfoSewer

This is how InfoSewer can use a time series of inflow at a specific node:   1.       Use a mean loading of 1 so that the values in the Inflow Time Series stay the same as your inflow units in InfoSewer (Figure 1)   Figure 1.   Load with […]

How to Use the Map Display for the Maximum Adjusted d/D or Maximum q/Q in an EPS InfoSewer Simulation

How to Use the Map Display for the Maximum Adjusted d/D  or Maximum q/Q in an EPS InfoSewer Simulation   You can do a Map Display of the adjusted d/D values (Figure 1)  from the Gravity Main Range Report (Figure 2) to show those pipes that are full thematically.  For example, the […]

InfoSewer Flow Attenuation Sensitivity

InfoSewer Flow Attenuation Sensitivity    The three Run manager parameters, Maximum Number of Segments, Minimum Travel Distance and the Minimum Travel Distance in InfoSewer and H2OMAP Sewer affect the shape and flow attenuation of the flow in a link.  The effect of using the flow attenuation is […]

InfoSWMM 2D Report Variables

InfoSWMM 2D Report Variables   The Junction Graph variables for 2D Depth, 2D Speed, 2D Froude Number, 2D Unit Flow, 2D Inflow, 2D Volume and 2D Angle for a InfoSWMM 2D simulation for up to 1000 years can be plotted in the Report Manager of InfoSWMM.  This is an image of the 2D inflow over a 10 year period […]

How are Negative Transect Elevations Used in SWMM5?

Subject:   How are Negative Transect Elevations Used in SWMM5?   You can have negative elevations in the Transects of SWMM 5 as the elevations are transformed internally to relative depths above the node inverts in the SWMM 5 engine (Figure 1).   The slope […]

How Does Green Ampt Cumulative Event Infiltration work in SWMM 5?

Subject:   How Does Green Ampt Cumulative Event Infiltration work in SWMM 5?   This graph shows the values of the internal SWMM 5 parameters for Green Ampt Infiltration for the pervious area of a Subcatchment during a simulation.  The parameters are:   ·         F or FTOT which is the cumulative event infiltration at the […]

How is Capillary Suction Head Used in SWMM 5 Green-Ampt?

Subject:   How is Capillary Suction Head Used in SWMM 5 Green–Ampt?   How sensitive is the infiltration loss and rate to the capillary suction head parameter in the SWMM 5 Green–Ampt  infiltration method.   Figure         1 shows how the total infiltration loss and total loss rate vary as […]

How is the Soil Saturated Conductivity Used in SWMM 5 Green-Ampt?

Subject:   How is the Soil Saturated Conductivity Used in SWMM 5 Green–Ampt?   How sensitive is the infiltration loss and rate to the Soil Saturated Conductivity parameter in the SWMM 5 Green–Ampt  infiltration method.   Figure 2 shows how the total infiltration loss and total loss rate vary as […]

There are Four factors in Rainfall Dependent Infiltration and Inflow or RDII in SWMM 5

There are Four factors in Rainfall Dependent Infiltration and Inflow or RDII in SWMM 5: 1.   The fractional response to Rainfall or R from 0 to 1 2.   The Time Base of the Unit Hydrograph or T in hours * Dimensionless K Shape Factor 3.   The Sewershed Contributing Area in […]

How is RDII Storage Simulated in SWMM 5?

Subject:  How is RDII Storage Simulated in SWMM 5?   If you are using the SWMM 5 Rainfall Dependent Infiltration and Inflow(RDII)  feature you can also use the RDII storage parameters to change the RDII runoff by simulating the storage in the Sewershed.   The code in RDII.C as implemented […]

Types of Stormwater Inlets from HEC12 and HEC22

Note:  Types of Stormwater Inlets from HEC12 and HEC22   Stormwater Inlets consist of four main types (http://onlinemanuals.txdot.gov/txdotmanuals/hyd/storm_drain_inlets.htm) with most common shown in Figure 1.   1.   Curb opening inlets either at a sag or continuous on the street, 2.   Grate Inlets either at a sag or in combination with […]

How to Easily Make a Smaller Model in InfoSWMM Using Trace Upstream Network

Subject:   How to Easily Make a Smaller Model in InfoSWMM Using Trace Upstream Network   Step 1.  Use the Trace Upstream Network command to find all of the network above the node of interest (Figure 1).  Step 2.  Use the Trace Downstream Network Command to find all of the network below the node of interest […]

How to Subdivide Subcatchments in SWMM 5

Subject:   How to Subdivide Subcatchments in SWMM 5   If you want to subdivide a larger Subcatchment in SWMM 5 and get around the same peak flow then a good suggestion would be to make sure that (Figure 1):   1.   The sum […]

What are the Types of Force Mains (FM) in SWMM 5?

Subject:   What are the Types of Force Mains (FM) in SWMM 5?   There are five ways to model a force main in SWMM 5 for the combination of full and partial flow in the force main (Figure 1):   1.       Full Flow using Darcy-Weisbach for the […]

How is the Orifice Setting Used in SWMM 5 RTC Rules?

Subject:  How is the Orifice Setting Used in SWMM 5 RTC Rules?   The Real Time Control Rule for Orifice Setting can be a function of a Setting constant, Setting from a Curve, Setting from a PID controller and a Setting from a Time Series (Figure 1).    The Setting affects the Full Depth […]

Low Impact Development Options in H2OMAP SWMM and InfoSWMM

Subject:  Low Impact Development Options in H2OMAP SWMM and InfoSWMM   The five options are:   1.       Rain Barrel 2.      Bio Retention Cell 3.      Infiltration Trench 4.      Vegetative Swale 5.      Porous Pavement   and be entered as controls in the Hydrology Section of the Operations Browser of H2OMAP SWMM or InfoSWMM (Figure 1) […]

Rules for NRSCS Unit Hydrographs in InfoSWMM and H2OMap SWMM

Subject:  Rules for NRSCS Unit Hydrographs in InfoSWMM and H2OMap SWMM   Rules or Guidelines for NRSCS Unit Hydrographs if used as the Hydrology Option in InfoSWMM and H2OMAP SWMM: 1.       The Unit Hydrograph CN comes from the Subcatchment Table and the NRCS_CN Column 2.      Time of Concentration is from the TC column in […]

How to Export all of your Data to a Shapefile Using InfoSWMM

Subject:  How to Export all of your Data to a Shapefile Using InfoSWMM   You can do this easily by using three steps which are shown in Figure 1, Figure 2 and Figure 3.   Figure 1.  Export Manager Tool   Figure 2.  Link and […]

How to use the Flow Splitter in InfoSewer for Dendritic Networks

Subject:  How to use the Flow Splitter in InfoSewer for Dendritic Networks   InfoSewer, which is an extension in Arc Map, does need to have slit split defined where gravity mains merge together to determine the amount of flow in each of the […]

How to Save Node and Link Summary Tables in H2OMAP SWMM to Shapefiles

How to Save Node and Link Summary Tables in H2OMAP SWMM to Shapefiles The export manager of H2OMAP SWMM is very flexible, you can export shape, MIF and CSV files but you have to do some copy and pasting to allow the program to export ALL […]

How to Use the Output Relate in Excel using H2OMAP SWMM

How to Use the Output Relate in Excel using H2OMAP SWMM You have to perform the following steps: 1.       Make an Output Relate (using the Operations Tab of the H2OMAP SWMM Browser) which will be the same as the Pipe Summary Table in the Output Report Manager2.      Run the model to make […]

Advanced Labeling in InfoSWMM or H2OMAP SWMM to show MM or IN on a HGL Plot

Advanced Labeling in InfoSWMM or H2OMAP SWMM to show MM or IN on a HGL Plot Here is how to get the maximum depth shown in millimeters or inches on a HGL Plot in InfoSWMM or H2OMAP SWMM– use the OTHER LINK Dimensions option.  You need to run the model again […]

Advanced Labeling in InfoSWMM or H2OMAP SWMM to show MM or IN on a HGL Plot

Advanced Labeling in InfoSWMM or H2OMAP SWMM to show MM or IN on a HGL Plot   Here is how to get the maximum depth shown in millimeters or inches on a HGL Plot in InfoSWMM or H2OMAP SWMM– use the OTHER LINK Dimensions option.  You need to run the model […]

Continuous Simulation using SWMM 5 LID and Groundwater Features in a Linked 1D/2D Network using InfoSWMM 2D for a 50 Year Period

Continuous Simulation using SWMM 5 LID and Groundwater Features in a Linked 1D/2D Network using InfoSWMM 2D for a 50 Year Period   A poster at the recent ECI conference on the […]

How to Create an InfoSWMM model from CSV Files

How to Create an InfoSWMM model from CSV Files   An InfoSWMM model can be newly created from a CSV file but it helps to have a background map or shapefile to initialize the Arc Map project.  BEFORE initializing yourInfoSWMM map Add a data layer […]

InfoSewer Minimum Travel Time Sensitivity

InfoSewer Minimum Travel Time Sensitivity   The three Run manager parameters, Maximum Number of Segments, Minimum Travel Distance and the Minimum Travel Time in InfoSewer and H2OMAP Sewer affect the shape and flow attenuation of the flow in a link.  The effect of decreasing the Minimum Travel Time is […]

How to Create an InfoSWMM model from CSV Files, Alternate Method

How to Create an InfoSWMM model from CSV Files, Alternate Method   An InfoSWMM model can be newly created from a CSV file but it helps to have an idea of the maximum extents before you initialize the Arc Map project.  Use the ArcGIS default and […]

InfoSewer By Discharge Control for a PUMP

InfoSewer By Discharge Control for a PUMP You can control the pumps in InfoSewer and H2OMap Sewer by using a Pump Control which will control the pump based on: 1.       Volume2.      Level3.      Discharge4.      Inflow5.      Time If you use a By Discharge control the pump speed of the pump is increased or decreased to pump the incoming Wet Well flow based on the pump rules […]

InfoSewer Inflow Control for a PUMP

InfoSewer Inflow Control for a PUMP   You can control the pumps in InfoSewer and H2OMap Sewer by using a Pump Control which will control the pump based on:   1.       Volume 2.      Level 3.      Discharge 4.      Inflow 5.      Time   If you use a By Inflow control the pump speed of the pump is increased or decreased […]

InfoSewer Maximum Number of Segments Sensitivity

InfoSewer Maximum Number of Segments Sensitivity   The three Run manager parameters, Maximum Number of Segments, Minimum Travel Distance and the Minimum Travel Distance in InfoSewer and H2OMAP Sewer affect the shape and flow attenuation of the flow in a link.  The effect of decreasing the […]

How to Make an Excel Fixed Width File from SWMM 5

How to Make an Excel Fixed Width File from SWMM 5 You can use this macro for MATLAB or some other DOS based program by using the Tools command of SWMM 5 and configuring the EXCEL file option.  If you use the EXCEL tool then your SWMM 5 input file will be opened up […]

Maximum HGL Head Class in InfoSWMM AND H2OMAP SWMM

Maximum HGL Head Class in InfoSWMM AND H2OMAP SWMM You can find the node flood or surcharge maximum occurrence during a simulation in the Junction Summary Report table in InfoSWMM and H2OMAP SWMM (Figure 1) Empty                                   if the Node Head is below or equal to the Lowest Link Connecting  […]

The Non Linear Term in the Saint Venant Equation of SWMM 5

Subject: Non Linear Term in the Saint Venant Equation of SWMM 5 The flow equation has six components that have to be in balance at each time step: 1. The unsteady flow term or dQ/dt 2. The friction loss term (normally based on Manning's equation except for full force mains), 3. The bed slope term or dz/dx […]

Successive under-relaxation for the SWMM 5 Dynamic Wave Solution

Subject:  Successive under-relaxation for the SWMM 5 Dynamic Wave Solution  SWMM 5 uses the method of Successive under-relaxation to solve the Node Continuity Equation and the Link Momentum/Continuity Equation for a time […]

How to Use the SWMM 5 Excel Tool with InfoSewer CSV Files

How to Use the SWMM 5 Excel Tool with InfoSewer CSV Files   1. Export Link and Manholes in InfoSewer for your current Scenario to CSV files, 2. Set up the Excel Add on for SWMM 5 by using the command Tools, and Configure Tools (see below) 3. Run SWMM 5 and edit the […]

How to Have both Depth and Elevation for the Node Rim Elevation in InfoSWMM

Subject:  How to Have both Depth and Elevation for the Node Rim Elevation in InfoSWMM   If you turn on  store Absolute Junction Rim option  then the Rim Elevation = Invert Elevation + Maximum Node Depth will be shown in the DB Table Junction Hydraulic Modeling Data and the Attribute Browser of InfoSWMM and H2OMAP SWMM   […]

How to Use the Arc Map Editor in InfoSWMM

Note:  How to Use the Arc Map Editor in InfoSWMM   Step 1 is to use the Edit Feature for example the Subcatchment layer to bring up the Arc Map Editor Tool.       Step 2 is to use the Reshape Feature tool or Vertex tools to bring […]

Connecting to Others Using Twitter, LinkedIn and Blogs for SWMM5, InfoSWMM and InfoSewer

Twitter besides being 140 characters of greatness has many third party tools such as Tweet Topic Exploreer which allows you to see visually your Tweets by subject, http://tweettopicexplorer.neoformix.com/#n=rdickinson I found it handy to see the interrelationships of […]

How to use the Flow Splitter in InfoSewer for Dendritic Networks

Subject:  How to use the Flow Splitter in InfoSewer for Dendritic Networks   InfoSewer, which is an extension in Arc Map, does need to have slit split defined where gravity mains merge together to determine the amount of flow in each […]

InfoSewer to InfoSWMM Import Tips

Subject:   InfoSewer to InfoSWMM Import Tips The direct import of InfoSewer to InfoSWMM (Figure 1) is both direct and robust but you need to be aware of Run Manager changes to optimize the InfoSWMMmodel: 1.       Make sure that the Flow Units in InfoSWMM Run Manager match the […]

Arc Map If Statements for Showing Flooding in InfoSWMM

Arc Map If Statements for Showing Flooding in InfoSWMM   You can use a combination of the Map Display in InfoSWMM and the Arc Map Label Properties to show the Maximum Ponded Volume at a node during amInfoSWMM simulation.    The label function in VBSCRIPT to show just […]

InfoSWMM (d/D v. Surcharge d/D)

Subject:   InfoSWMM (d/D v. Surcharge d/D)   What is the difference between the output variables d/D and Surcharge d/D in InfoSWMM and H2OMap SWMM   The d/D is calculated as link capacity based on the midpoint depth of water in the link or Link depth/ Link Maximum Depth […]

How to Use Trace Upstream, Domain Manager and Facility Manager in InfoSewer to Find the CE

Subject:   How to Use Trace Upstream, Domain Manager and Facility Manager in InfoSewer to Find the CE   InfoSewer does not have table of node continuity errors only an overall continuity error balance.  If you have a continuity error then you can use the process of divide and conquer […]

Water Age in InfoSewer

Note:   Water Age in InfoSewer   InfoSewer and H2OMAP Sewer have a Water Quality option called Time of Concentration (TOC) or Water Age that allows the modeler to estimate the residence time in his or her Sewer Network.    The use of Water Age is simple, you just pick TOC(AGE) […]

Modeling H2S in InfoSWMM, ICM and InfoSewer

Subject:   Modeling H2S in InfoSWMM, ICM and InfoSewer You can model Sulfide in InfoSWMM/ICM and InfoSewer using the H2S water quality modeling option which uses BOD5 loading at nodes to estimate the  S concentration in the nodes and links of the […]

Mass Balance for Water Quality in SWMM 5

Subject:   Mass Balance for Water Quality in SWMM 5   The rainfall concentration is listed in the wet deposition row of the Runoff Quality Continuity Table, the washoff such as EMC washoff is listed in the Surface Runoff row.  If you are […]

Convolution of the RDII UH from R, T and K in SWMM 5

Subject:  Convolution of the RDII UH from R, T and K in SWMM 5   The convolution uses the value of R and the Time Base to estimate the amount of Infiltration and Inflow in the Sewer Network.  The short, medium and long term UH‘s […]

What are the Equations for Weirs in SWMM 5, Part 2?

Subject:   What are the Equations for Weirs in SWMM 5, Part 2?   There are four types of Weirs in SWMM 5:  Transverse, Sideflow, V Notch and Trapezoidal.   The trapezoidal weir is a combination of the Sideflow and V Notch Weir and the Sideflow […]

Water Quality Treatment Removal Variables in SWMM5

Subject:    Water Quality Treatment Removal Variables in SWMM5   The treatment variables for Water Quality in a SWMM 5 storage unit (Figure 1) can be either:  1.       A Process Variable a.       HRT or Hydraulic Residence Time b.      DT or Time Step c.       FLOW or The Current Inflow d.      DEPTH or […]

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