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SWMM rain-garden - accounting for exfiltration

Hi there users, Having some trouble modelling rain-gardens in SWMM. I have a few rain-gardens draining impervious surfaces in an urban catchment.  In checking the detailed rain-garden flux files, it would appear that there is no exfiltration and the soil moisture never falls below porosity.  I am thinking that perhaps I need to add an Aquifer so that water from the rain-garden recharge the aquifer? But I do not have any details on the local aquifer. Is it somehow possible in SWMM to specify a realistic exfiltration rate of the soils surrounding the rain-garden?  Thanks, Matt.

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Problems with SSA version of SWMM computing peak inlet flows

I am using Autodesk SSA version of SWMM.  I am getting unreasonable results that are too high when the inlet is completely submerged by a flow that is say 5 times the inlet capacity.  The program appears to calculate the flow in the upstream link based on the depth at the inlet based on an iterative calculation.  The peak flow is obviously too high.  This flow then continues downstream and makes all the downstream flows too high.  However, when I check the Total Inflow on the Time Series Plot, the Total Inflow to the inlet looks about right.  Can anyone help me on this?  I have also joined the AUTODESK blog and asked the same question.   Our company is modeling an entire drainage system for a small town in Colorado.

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Baseline/sanitary flow variation outside of typical parameters

Hello! I am working on a SWMM 5 continuous model.  I have a sanitary DWF that varies every three days due to an industrial discharge, so none of the pre-set flow variation patterns (hourly, daily, monthly)  will vary the flow appropriately.  Is there a method where I can enter a the dwf in an external file and have the node look to the file for the inflow?  Thanks - Erin

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5 Replies · Reply by Erin Moore Sep 15

LID area and impervious runoff calculations

Hi users, Just a query regarding LID's in SWMM. Let's say that impervious sub-catchmant A has a total area of 100 m2.  Let's say that I deploy a LID into sub-catchment A (a rain barrel) and set its surface area as 10 m2 (thus it occupies 10% of sub-catchment in A). In doing this, does SWMM therefore calculate the runoff from sub-catchment A using an 'adjusted' area of 90 m2? Cheers, Matt. 100SM.inp

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5 Replies · Reply by Robert Dickinson Sep 4

"Edit Object" window won't open

Since yesterday my the "edit object" button won't open anymore. Also right click and chosing properties won't give information about the object. I have been working with SWMM for a few months now. I already tried to uninstall and install SWMM a few times. Can anyone give a suggestion on how to solve this problem?

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13 Replies · Reply by Anna Sep 9

Pollutant removal (treatment) - Setting a constant concentration as the result of the treatment expression

Hello there, I am trying to set a constant outflow concentration as the result for a treatment-equation, i.e. BOD: C=50.Unfortunately, setting a constant value for the concentration does not work, the result of the effluent concentration would be just the same. However, I want the concentration to be exactly the value I selected in the treatment-expression. Moreover, it seems like every treament-expression with C=... leads to invalid results... What can I do to fix this? Defining an additional inflow at the correspondent node is not sufficient, as my flow should not change. Furthermore, I am trying to implement an equation where a pollutant stands in the exponent of a equation, i.e. HRT^(0.75*TSS). With this expression, I would get an error when trying to simulate (invalid expression). Is it not possible to use this kind of expression? What else can I do to solve this issue? Kind regards (from Germany) Robert

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3 Replies · Reply by Robert Schleifenbaum Aug 26

Having issues with a storage basin drain down simulation

Hi, I'm having issues with an  attenuation feature. I've simulated the rainfall event (24 hours) and now I'm looking to see how long it will take to drain down using outlets with Head/flow relationships (simulated vortex controls e.g hydrobrake). Problem is that the storage unit doesn't want to drain down after 24 hours - even though in the map view I can see flows out of the feature in the subsequent days. Its stuck at the same level and volume. Any ideas? Ian

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2 Replies · Reply by Ian Griffin Aug 21

Storage Unit, No Volume Change

ModSilverberry4SWMMModelSimplified.INP Hello, For my job during the summer, I've been assigned to model a storm water pond using SWMM 5.1. My goal is to estimate the distribution of the ponds total storm water inflow at each of the pond's inlets (The pond I'm working on has 4). I intend to build a fairly high resolution model, but at the moment it is fairly simplified. I have a basic storage unit with 4 attached inlets and 4 sub-catchments which drain into the pond.  When I run the simulation I obtain a continuity error of over 18% for routing and when I look at the simulation results, specifically the depth of the pond, I see no change, even after running a 100 year storm event. This makes no sense to me as I've set the evaporation and seepage values in the storage unit to 0 AND when I look at the total inflow graph for the storage unit, I can see the expected inflow into the pond. So the pond receives an inflow, but I see no noticeable change in depth even when zooming in on the…

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7 Replies · Reply by Robert Dickinson Aug 27

Pump Curve Behavior

I am new to trying to model VFD Pumps. I have a single pump running on a single type 3 curve without controls besides on-off levels. Looking at the pump operation curve, the purple diamond indicates that the pump is operating on the curve most of the time but at various time steps the red line of the curve changes so that the purple indicator is no longer riding along it. It looks like the pump is operating at the same flowrate but the curve changes. Is this a graphical error or is there something going on? I've attached screenshots fr reference. Also, what is the best way to ensure that the pump and forcemain are operating correctly according to the system curve? Thanks for any insight.

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4 Replies · Reply by Ross Volkwein Jun 27

MatLab and SWMM5

open .out file

Hello everyone, I would like to read the .out file in a text editor created after a simulation in SWMM5. However I can't get anything readable when I open the file in notepad or some equivalent software. As I would like to combine SWMM and Matlab, I need to see and understand the structure of the .out file... Anyone knows how to do that? Thanks, Nicolas

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4 Replies · Reply by deville May 27

Sample code and example for link SWMM to Matlab

Hello folks, I was happy for the fact that I found this website but my excitement didnt last long! I read all of the dicussions here but I couldnt find a post which directly show me how to connect Matlab to SWMM. Yes, you do parallel processing and all of the fancy stuff with SWMM but I still don't know how call the SWMM! I may have missed something. I'm looking for a sample code to call SWMM from Matlab and do some changes to calibrate and essentially optimize the specific parameters. I think…

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0 Replies · Reply by Andres Riaño Apr 26

Re: parallel swmm and matlab

Hi Ive been running an optimization of swmm using matlab. I was hoping to use the multistart and ga algorithms in parallel mode so I could make use of a multicore PC. I havent been able to get this running  (serial optimization is ok), since parallel calls are being made to SWMM and something is being overwritten.. What Ive tried is: - rename SWMM5.exe in matlab folder to SWMM5_1,2,3 corresponding to the core no. - assign the current .inp file to the current core number - cycle through the…

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4 Replies · Reply by Dave Morgan Mar 2

editing subcatchment, node and conduit parameters using swmm5 interface commands

Hi there, I am going to edit some parameters in swmm5 input file through swmm5 interface commands. Is it possible to do that or not? I can find some commands to read results for example GetSingleResult to view simulation results for particular parameters but I can not find any commands to change some particular parameters as an new input file. I think this can be done for Epanet2 through epanet toolkit.  Please tell me if it is possible to change input file parameters (for example…

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2 Replies · Reply by yasert Mar 5, 2013

How can MATLAB change some parameters in SWMM5 inp file?

Dear all,I want to use MATLAB and SWMM5 for optimal calibration. In doing so:1) MATLAB has to generate some random values (decision variables) as inputs for SWMM5 (here is width of subcatchments2)Previous subcatchment widths replaced with New ones. So it is necessary that MATLAB reads inp file and replaces older subcatchment widths with generated values.3)SWMM5 has to run in DOS version (swmm54)MATLAB has to read rpt file and picks some result to calculate objective function5) generate other…

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7 Replies · Reply by Robert Dickinson Apr 8, 2013

linking SWMM5 GUI to MATLAB

Hi every body I want to design urban drainage system using optimization technique. Decision variable is for example ( pipe diameter).  My optimization code develops in MATLAB. How can I link MATLAB with SWMM5 so that in each iteration pipe diameters are chosen and SWMM is run. Objective function are then  determined and next iteration will be started  the same as previous iteration. I have a question about above mentioned problem: Can I link MATLAB with SWMM5 GUI or not? If yes, How? If no, is…

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28 Replies · Reply by zahra zahmatkesh Jun 28, 2013

SWMM5 Forums

Baseline/sanitary flow variation outside of typical parameters

Hello! I am working on a SWMM 5 continuous model.  I have a sanitary DWF that varies every three days due to an industrial discharge, so none of the pre-set flow variation patterns (hourly, daily, monthly)  will vary the flow appropriately.  Is there a method where I can enter a the dwf in an external file and have the node look to the file for the inflow?  Thanks - Erin

Read more…
5 Replies · Reply by Erin Moore Sep 15

LID area and impervious runoff calculations

Hi users, Just a query regarding LID's in SWMM. Let's say that impervious sub-catchmant A has a total area of 100 m2.  Let's say that I deploy a LID into sub-catchment A (a rain barrel) and set its surface area as 10 m2 (thus it occupies 10% of sub-catchment in A). In doing this, does SWMM therefore calculate the runoff from sub-catchment A using an 'adjusted' area of 90 m2? Cheers, Matt. 100SM.inp

Read more…
5 Replies · Reply by Robert Dickinson Sep 4

"Edit Object" window won't open

Since yesterday my the "edit object" button won't open anymore. Also right click and chosing properties won't give information about the object. I have been working with SWMM for a few months now. I already tried to uninstall and install SWMM a few times. Can anyone give a suggestion on how to solve this problem?

Read more…
13 Replies · Reply by Anna Sep 9

Pollutant removal (treatment) - Setting a constant concentration as the result of the treatment expression

Hello there, I am trying to set a constant outflow concentration as the result for a treatment-equation, i.e. BOD: C=50.Unfortunately, setting a constant value for the concentration does not work, the result of the effluent concentration would be just the same. However, I want the concentration to be exactly the value I selected in the treatment-expression. Moreover, it seems like every treament-expression with C=... leads to invalid results... What can I do to fix this? Defining an additional…

Read more…
3 Replies · Reply by Robert Schleifenbaum Aug 26

Having issues with a storage basin drain down simulation

Hi, I'm having issues with an  attenuation feature. I've simulated the rainfall event (24 hours) and now I'm looking to see how long it will take to drain down using outlets with Head/flow relationships (simulated vortex controls e.g hydrobrake). Problem is that the storage unit doesn't want to drain down after 24 hours - even though in the map view I can see flows out of the feature in the subsequent days. Its stuck at the same level and volume. Any ideas? Ian

Read more…
2 Replies · Reply by Ian Griffin Aug 21

Storage Unit, No Volume Change

ModSilverberry4SWMMModelSimplified.INP Hello, For my job during the summer, I've been assigned to model a storm water pond using SWMM 5.1. My goal is to estimate the distribution of the ponds total storm water inflow at each of the pond's inlets (The pond I'm working on has 4). I intend to build a fairly high resolution model, but at the moment it is fairly simplified. I have a basic storage unit with 4 attached inlets and 4 sub-catchments which drain into the pond.  When I run the simulation I…

Read more…
7 Replies · Reply by Robert Dickinson Aug 27

Pressurized nodes in EPA SWMM

Hello everybody! I'll like to know if is it possible to prevent flooding in nodes (no storage nodes). The problem happens when I close R-1 and R-2 completely, because C-11 reaches its maximum capacity and then N-1 begins to flood. I would like that the model were more realistic and C-5 started to reach its maximum capacity as well as SILENCIO tank fills faster. It is a distribution model thus the flow is presurized. 

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1 Reply · Reply by Robert Dickinson Jun 8

SWMM5 Blogs

Modeling "Leaf" Gates

I am trying to determine the best way to represent "leaf" gates in SWMM5.  The gate consists of two panels that overlap each other.  The top gate serves as an overflow weir and drops as the upstream water level rises.  If the top gate is fully…

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Diversion Sturctures and SSO events in SWMM 5

I'm a new user to SWMM and i'm currently trying to model SSO events at a waste water treatment plant. I've been using dynamic routing and I've been having trouble modeling the diversion structure. Currently I have a storage node acting as a wet…

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Comments: 1

Running SWMM5 Using .bat files

Hi Robert,

I have a folder with many inp files representing different urbanization scenarios for a watershed in VA. I would like to automate the processing of this files because it is something I'll most probably will have to do…

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Comments: 1

Large data output extraction in SWMM

Hi,

I have developed a model with 33 subcatchments using 1 year hourly  rainfall data. The problem is when I try to get the runoff for all the subcatchments it says '' too many objects to display".

It would be really…

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Comments: 1

hi,

i have every 1h of total 12h rainfall time series data and run for 12h . so i got total precipitation in status report is 108 mm but when i sum up total time series is 112mm which is grater then report.

moreover when i…

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Comments: 1

thanks bob for your reply, can you tell me another issues like total precipitation in status report how it is calculated? i am using time series rainfall for 10 minute interval as intensity. total precipitation value and depth in status are not…

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Comments: 2

flood Volume in canal system

hi, how to calculate the volume spilled from
the Khals in SWMM 5.0?
can anyone help on this issue?
In Status report of SWMM, final storage volume is shown after simulation. is this value  my required value? please help on this…

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Comments: 3

Forum Categories

The Forum Categories are greatly expanded.  If you go to the Menu Item Forums you can get discussions on Matlab and DOS SWMM5, SWMM5, InfoSWMM, InfoSewer, Hydrology in SWMM5, Hydraulics in SWMM5, Water Quality and SWMM 5 LID's.  The Blogs and the Forums now have either categories of Tab Linked Searches for SWMM5,  Hydrology, LID, RDII, InfoSWMM etc.
                           SWMM 5 Forums InfoSWMM Forums
                           Hydrology Forums InfoSewer Forums
                           Hydraulics Forums Water Quality Forums

SWMM5 Forum Hydrology Forum Hydraulics Forum Hydraulics Forum Hydraulics Forum Water Quality MATLAB/DOS SWMM5 LID Forum
SWMM5 Forum Hydrology Forum Hydraulics Forum InfoWWMM Forum InfoSewer Forum Water Quality MATLAB/DOS SWMM5 LID Forum

Welcome

If you just want to read you do not need to sign in but if you want to add a discussion or blog then you need to sign in as a Ning user.  If you do not want to do either then you can send me an email to robert.dickinson@gmail.com or robert.dickinson@innovyze.com and I will do my best to answer your questions.  Thanks for visiting and I hope you found something useful! Read here for reasons you should make a profile.  

We also have a blogspot blog for SWMM5, InfoSWMM and InfoSewer which has a local and Google Search option so it is easier to find tagged information on  SWMM5.NET and the Wordpress Site SWMM5.ORG  You can also see my recent posts on Twitter and the Official Innovyze Blog which also has great information on ICM and IWCS.

Important News about the current SWMM 5.1

Introduction

Stormwater Management Model (SWMM) Information for watershed water quality, hydrology and hydraulics modelers (not associated with the EPA)  We also cover modeling in general, InfoSWMM, InfoSewer, IWCS, IW ICM, Rainfall, Evaporation and general programming connected to the SWMM 5 program. If you enter a search word of phrase in the Custom Search Engine dialog below it will search just this site.  I do a lot of tweeting so looking at my tweet activity will show most of my recent activity. My twitter name is RDICKINSON
Another new and a method I really like is to search my Twitter Feed - Click Here to See An Example.
Search should be @RDICKINSON followed by a Keyword

Activity

Robert Dickinson left a comment for David Wang
"Welcome David!"
yesterday
David Wang is now a member of SWMM5 - Stormwater Management Model
yesterday
Robert Dickinson posted a blog post
detetention_pond.inp




Subject:  Detention Basin Basics in SWMM 5
 What are the basic elements of a detention pond in SWMM 5?  They are common in our backyards and cities and just require a few basic elements to model.  Here is a model in SWMM 5.0…
Sunday
Robert Dickinson left a comment for Anuj Kumar
"Welcome Anuj!"
Sep 25
Anuj Kumar posted a discussion
Hi I am new member to this forum as well new to EPA SWMM. As per city of Calgary need to model storm detention in EPA SWMM 5.1 for the project area 3.3 ha and need to know how much volume of storage required, permissible release rate is 80 l/s/ha. I…
Sep 25
Anuj Kumar is now a member of SWMM5 - Stormwater Management Model
Sep 25
Matt Burns posted a discussion
Hi there users,Having some trouble modelling rain-gardens in SWMM. I have a few rain-gardens draining impervious surfaces in an urban catchment. In checking the detailed rain-garden flux files, it would appear that there is no exfiltration and the s…
Sep 23
Robert L. Porter posted a discussion
I am using Autodesk SSA version of SWMM.  I am getting unreasonable results that are too high when the inlet is completely submerged by a flow that is say 5 times the inlet capacity.  The program appears to calculate the flow in the upstream link ba…
Sep 22
Robert Dickinson left a comment for Robert L. Porter
"Welcome Robert!"
Sep 22
I am working on a SWMM model of an entire drainage system for a small town in Colorado.
Robert L. Porter is now a member of SWMM5 - Stormwater Management Model
Sep 22
Robert Dickinson left a comment for A mbarnil Panda
"Welcome Panda!"
Sep 18
A mbarnil Panda is now a member of SWMM5 - Stormwater Management Model
Sep 18
Robert Dickinson posted a blog post
#INFOMASTER from @INNOVYZE https://t.co/WmHBYTMZ1S InfoMaster 9-Minute Demo (Spanish) pic.twitter.com/zbYP4MiIO8
— Robert E Dickinson (@RDickinson) September 17, 2014
Sep 18
Michal B commented on MeHa's blog post ArcGIS data into SWMM
"ok, so how to create csv file from inp? If I ask stupid question, please apologize. I dont know how to do it?"
Sep 18
Rui Daniel Pina commented on MeHa's blog post ArcGIS data into SWMM
"You can use the inp file to create a csv and import it to GIS...then create shapefiles or whatever format you need."
Sep 18
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