SWMM 5, InfoSWMM, H20MAP SWMM, InfoSewer for Water Quality,Hydrology, Hydraulics, 2D and RTC

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.
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Antecedent dry days for a single event and in a continuous simulation

Hi, i hope someone can help me about this misunderstanding:  considering a single precipitation event, i can not undestrand if i have to insert, as imput, the "initial build up" or the "antecedent dry days", or both of them. I guess i have to set only the "initial build up"  (because, knowing antecedent dry days, i can estimate it), is that so? Instead, in a continuos simulation, what should i do? I guess, in this case, that SWMM derives "antecedent dry days" directly from time series, and "initial build up" (before each event) considering the material's quantity not washed during the previous event... I'm sorry for my english, I hope I was clear, and that someone can explain this question

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Overland Flow length computation in ArcGIS

I tried to estimate the length of overland flow using Flow Direction and Flow Length tool in ArcGIS. But the problem is that my sub catchments are mostly of rectangular shape (i.e. not he originally delineated sub watershed).  I would like to make one more point that earlier I have taken the square root of sub-catchment area to estimate the width of the catchment. I am not sure about the applicability of any of  the aforementioned method for estimating the width of the catchment,  please write your opinions.  Any help will be highly appreciated.  

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Pond design in SWMM

Dear Bob I am trying to design a pond in SWMM where I want to maintain atleast 1m depth of water before allowing the discharge from the pond. For this I have given 1m initial depth of water in the pond and kept its height as 2.5 m, but while simulating it water is depleting below 1m depth, how is it possible? What could be the error in my model setup ? Please have a look in the result.

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How to model a side entry pit in SWMM?

Hi there users, I'm currently using SWMM V5 to model the drainage network for a small urban catchment. There are a few side entry pits along the road—these pits capture road runoff.  I was wondering, is there a way in SWMM to specify the inlet capacity of such pits?  In reality, such pits do not have "unlimited" inlet capacity and I would be keen to capture this in my model. Thanks, Matt.

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VARIABLE_STEP format

Hello everyone, I just started working with swwm 5.1 and I'l already stuck... I try a very simple model to understand how the software works and I can't run anything at all. Here is the example I'm working on (in fact it's simply the tutorial proposed by EPA) model.png When I try to compile it, I received the error message:   ERROR 211: invalid number 0,80 at line 31 of [OPTION] section:  VARIABLE_STEP However, no matter what I change in the option panel, I can't solve this error. It is said in the documentation that such an error is a wrong number format (negative number for instance). As it is a by default value I just don't know what to do. Does anyone has an idea how to proceed? Thanks in advance, Best, Nicolas

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11 Replies · Reply by Robert Dickinson on Tuesday

Simulating 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 lowered and the upstream water level is still rising, then both gates would be lifted up to create an underflow outlet.  This would then eliminate the overflow aspect.   My thought is to model two separate gates.  The overflow gate would need some kind of timeseries to control (lower) the crest elevation of the overflow gates until the upstream water surface elevation exceeds level X.  At that time, the overflow gate would close and flow goes to zero.   A separate underflow gate would open to full capacity if the upstream water surface elevation exceeds level X.   I welcome your suggestions on how best to tackle this issue.  Thanks.

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1 Reply · Reply by Peter deGolian Mar 17

SWMM5.EXE

Could someone help me how to create SWMM5.EXE to run SWMM5 from DOS command? I downloaded source code from EPA site < Source code for the SWMM 5.0.022 computational engine> and followed the instruction given in readme.txt file under "makefiles\VC6_CON" directory.   When I give the command <nmake /f SWMM5-CON.MAK> it gives an error message:  'nmake' is not recognized as an internal, or external command, operable program or batch file.

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2 Replies · Reply by Krishna Mar 14

Unit Hydrograph Editor - Initial Abstraction Depth

Hi All, As you all should know, about the Unit Hydrograph Editor - Initial Abstraction Depth, one can read: «Select this tab to provide parameters that describe how rainfall will be reduced by any initial abstraction depth available (i.e., interception and depression storage) before it is processed through the unit hydrographs defined for a specific month of the year. Different initial abstraction parameters can be assigned to each of the three unit hydrograph responses. These parameters are: · Dmax: the maximum depth of initial abstraction available (in rain depth units) · Drec: the rate at which any utilized initial abstraction is made available again (in rain depth units per day) · Do: the amount of initial abstraction that has already been utilized at the start of the simulation (in rain depth units).» Unfortunately, the manual does not specify support characteristic values​​, neither examples to serve as references for user apply. Does anyone know a procedure for calculating…

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2 Replies · Reply by Valter Albino Mar 7

MatLab and SWMM5

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

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 in EXCEL and you can use this macro to make a fixed format file for SWMM 5.  Note, SWMM 5 does not use fixed format but other programs may need it for reading,  You adjust the column widths in the macro for your program. Here…

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SWMM5 Forums

Overland Flow length computation in ArcGIS

I tried to estimate the length of overland flow using Flow Direction and Flow Length tool in ArcGIS. But the problem is that my sub catchments are mostly of rectangular shape (i.e. not he originally delineated sub watershed).  I would like to make one more point that earlier I have taken the square root of sub-catchment area to estimate the width of the catchment. I am not sure about the applicability of any of  the aforementioned method for estimating the width of the catchment,  please write…

Read more…
0 Replies

Pond design in SWMM

Dear Bob I am trying to design a pond in SWMM where I want to maintain atleast 1m depth of water before allowing the discharge from the pond. For this I have given 1m initial depth of water in the pond and kept its height as 2.5 m, but while simulating it water is depleting below 1m depth, how is it possible? What could be the error in my model setup ? Please have a look in the result.

Read more…
0 Replies

VARIABLE_STEP format

Hello everyone, I just started working with swwm 5.1 and I'l already stuck... I try a very simple model to understand how the software works and I can't run anything at all. Here is the example I'm working on (in fact it's simply the tutorial proposed by EPA) model.png When I try to compile it, I received the error message:   ERROR 211: invalid number 0,80 at line 31 of [OPTION] section:  VARIABLE_STEP However, no matter what I change in the option panel, I can't solve this error. It is said…

Read more…
11 Replies · Reply by Robert Dickinson on Tuesday

Simulating 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 lowered and the upstream water level is still rising, then both gates would be lifted up to create an underflow outlet.  This would then eliminate the overflow aspect.   My thought is to model two separate gates.  The overflow gate would need some kind of…

Read more…
1 Reply · Reply by Peter deGolian Mar 17

SWMM5.EXE

Could someone help me how to create SWMM5.EXE to run SWMM5 from DOS command? I downloaded source code from EPA site < Source code for the SWMM 5.0.022 computational engine> and followed the instruction given in readme.txt file under "makefiles\VC6_CON" directory.   When I give the command <nmake /f SWMM5-CON.MAK> it gives an error message:  'nmake' is not recognized as an internal, or external command, operable program or batch file.

Read more…
2 Replies · Reply by Krishna Mar 14

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…

Read more…

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.

New Photos

Important News

Activity

Robert Dickinson left a comment for Hyun Soo, Ko
"Welcome Hyun!"
10 hours ago
lau replied to MeHa's discussion SWMM calibration using PEST
"Hi, Sergio, I read  your post, it is great help to me, can you send me a example to learn how to prepare the files for PEST  to calibrate the SWMM? Thanks a lot."
yesterday
lau replied to MeHa's discussion SWMM calibration using PEST
"Hello, I am try to use PEST to calibrate SWMM model, but I can find the attached files mentioned by this post, can anyone help me? I want to learn a example of PEST  calibration SWMM. Thank you very much."
yesterday
Robert Dickinson replied to deville's discussion VARIABLE_STEP format
"There is a fix for this issue in SWMM 5.1.003 http://www.swmm5.net/2014/04/release-of-swmm-51003.html"
Tuesday
Robert Dickinson left a comment for lau
"Welcome Lau"
Monday
Robert Dickinson left a comment for YQ ZHANG
"Welcome YQ!"
Monday
Robert Dickinson left a comment for Saeed Nazari
"Welcome Saeed!"
Monday
Robert Dickinson left a comment for runriva
"Welcome runriva!"
Monday
Francesc Roca replied to deville's discussion VARIABLE_STEP format
"The problem is in the setting of Windows (not SWMM).I simply changed the commas with dot in Control Panels then convert all the commas in my file and that was it!"
Apr 11
valentinasb replied to deville's discussion VARIABLE_STEP format
"So have you only changed the decimal mark from comma to dot in the control panel and it works?  Thanks again.  "
Apr 11
Francesc Roca replied to deville's discussion VARIABLE_STEP format
"Yes, I solved de problem. I just followed the Robert's solution"
Apr 11
valentinasb replied to deville's discussion VARIABLE_STEP format
"I have the same problem and I'm not able to solve it. I have also modified dot and comma in the control panel but it doesn't work. Have you solved the problem? Thanks!"
Apr 11
Robert Dickinson left a comment for valentinasb
"Welcome  valentinasb"
Apr 11
Robert Dickinson left a comment for Nelson Jorge Gaudêncio Carriço
"Welcome Nelson!"
Apr 11

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