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Wash-off equation

Hi evrybody, Is it possible to introduce in SWMM a new was-off equation or I can only choose from the equation that there are inside? Imagine any type of equation. Polynomial, or logarithmic, anything. Does SWMM allow the user to include any equation? Does the question I need to answer. Thank you in advance. Angela

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Area of each unit - Modelling rain barrels in SWMM 5

Does the 'area of each unit' when modelling rain barrels in SWMM represent the area of the impervious area contributing run-off into the rain barrel (for example the roof area) or the cross sectional area of the rain barrel itself? SWMM user manual and 'help' interprets this as the 'surface area devoted to each replicate unit'. However, it is still not out rightly clear. Feedback and discussion on this are most welcome.

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External Input File for SWMM

I have 8 subcatchments in a watershed and all these 8 subcatchments have 8 different curve number values(infiltration model).I want to vary the curve number values and look at the change in the associated hydrograph. Can you kindly suggest me in which programming language I should write the code so that it is possible to vary the Curve number values through that code instead of manually changing each subcatchemnt values.The total iterations of vhange in curve number values will be 256 so manually doing this will take a lot of time.Writing the code wont be that difficult.I just want to know in which language I should do it(Like C,Matlab,etc.). Thankyou

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3 Replies · Reply by Robert Dickinson Nov 22

Using Curve Number in SWMM 5.0

Hello, I am new to the site and hoping to get a few questions answered about the newest version of SWMM.  I am currently a student working on a design project and we have choosen SWMM to model stormwater mangement in a cluster resdential development.  I started using HEC HMS and then switched to SWMM a little later and I used the curve number method to generate my runoff depth for pre development and post development conditions.  For some reason the pre development conditions are extremely off, HEC HMS gave me about 0.62 inches of runoff and SWMM gave me about 1.5 inches of runoff (there is no impervious area pre development).  The post development was much closer (only about 0.2 inches off).  I've checked the curve numbers to make sure they are right and other parameters (area, width, rainfall, etc.) are the same.   Has anyone experienced this problem before? Any insight or suggestions would be greatly appreciated! Thanks!

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1 Reply · Reply by Robert Dickinson Oct 27

Excessive Continuity Errors in node (SWMM5)

Hi, I am trying to model an infiltration pond in SWMM and get excessive (90%+) continuity errors for the pond node.  The overall flow routing continuity error is zero for the site.  The pond is set up to have a high flow bypass for a continuous model such that the majority of the analyzed storm events infiltrate and never pond to the bypass.  Has anybody run into an issue like this before?   Thank.

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1 Reply · Reply by Robert Dickinson Oct 23

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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2 Replies · Reply by Robert Dickinson Nov 22

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

External Input File for SWMM

I have 8 subcatchments in a watershed and all these 8 subcatchments have 8 different curve number values(infiltration model).I want to vary the curve number values and look at the change in the associated hydrograph. Can you kindly suggest me in which programming language I should write the code so that it is possible to vary the Curve number values through that code instead of manually changing each subcatchemnt values.The total iterations of vhange in curve number values will be 256 so…

Read more…
3 Replies · Reply by Robert Dickinson Nov 22

Excessive Continuity Errors in node (SWMM5)

Hi, I am trying to model an infiltration pond in SWMM and get excessive (90%+) continuity errors for the pond node.  The overall flow routing continuity error is zero for the site.  The pond is set up to have a high flow bypass for a continuous model such that the majority of the analyzed storm events infiltrate and never pond to the bypass.  Has anybody run into an issue like this before?   Thank.

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1 Reply · Reply by Robert Dickinson Oct 23

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…

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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…

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7 Replies · Reply by Robert Dickinson Aug 27

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.

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

Important News about the current SWMM 5.1

Activity

Robert Dickinson left a comment for Mike Phillips
"Welcome Mike!"
yesterday
Mike Phillips and Ning HOU joined SWMM5 - Stormwater Management Model
yesterday
Robert Dickinson left a comment for Ning HOU
"Welcome Ning!"
yesterday
Angela Gorgoglione posted a discussion
Hi evrybody,Is it possible to introduce in SWMM a new was-off equation or I can only choose from the equation that there are inside?Imagine any type of equation. Polynomial, or logarithmic, anything. Does SWMM allow the user to include any equation?…
Wednesday
Angela Gorgoglione replied to Angela Gorgoglione's discussion Pesticides processes in SWMM
"Imagine any type of equation. Polynomial, or logarithmic, anything. Does SWMM allow the user to include any equation? Does the question I need to answer."
Wednesday
Robert Dickinson replied to Angela Gorgoglione's discussion Pesticides processes in SWMM
"You would have to recompile to insert a new equation. What does your equation look like?"
Wednesday
Angela Gorgoglione replied to Angela Gorgoglione's discussion Pesticides processes in SWMM
"Thank you for the useful information.
I have another question for you about wash-off equation: is it possible to introduce in SWMM an equation or I can only choose from the equation that there are inside?
Thank you in advance.
Angela"
Wednesday
Seith Mugume posted a discussion
Does the 'area of each unit' when modelling rain barrels in SWMM represent the area of the impervious area contributing run-off into the rain barrel (for example the roof area) or the cross sectional area of the rain barrel itself? SWMM user manual…
Tuesday
Robert Dickinson left a comment for Katerina Antoniou
"Welcome Katerina!"
Monday
Katerina Antoniou is now a member of SWMM5 - Stormwater Management Model
Monday
Arash Kanani replied to Anuj Kumar's discussion Storage Volume Required calculation in EPA SWMM 5.1
"Dear Anuj,
Did you find any solution for this? I have the same question.
Best regards
Arash"
Monday
Robert Dickinson left a comment for momen salem
"Welcome Momen!"
Dec 11
momen salem is now a member of SWMM5 - Stormwater Management Model
Dec 11
Arash Kanani left a comment for Arash Kanani
"Dear Robert,
Many thanks for your kind attention. I have a rainfall data. It is based on QHM model. I would like to use this rainfall data file in SWMM.
90 is the year (1990), month, day, and then 24 numbers for 24 hour rainfall. I guess it should b…"
Dec 9
Robert Dickinson replied to Marek Zawilski's discussion Pollutant accumulation plot
"This would be difficult without modify the SWMM 5 GUI and engine to show the actual buildup on the catchments."
Dec 9
Robert Dickinson left a comment for Arash Kanani
"Welcome Arash, regarding your problem rainfall file attach it and I can take a look at the problem."
Dec 9
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