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Lumped catchment reacts too fast

I lumped my catchment - disregarding the details of the sewer nework and repalacing it with an equivalent subcatchment -  but it offten reacts faster than the detailed sewer network model. Any research or idea on this? I tried to include a  link down stream of the subcatchment which improved the fit between detailed and lumped model.

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Combine two SWMM projects

Hi, I have a SWMM project representing one catchment, I want to add another SWMM project (of another nearby catchment produced separately) inorder to have a combined project representing both catchments. What is the best way to do this? Do I have to edit the .inp file manually?

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2 Replies · Reply by MeHa on Thursday

Parameter for 'delaying' modelled flow

Hi, I am trying to calibrate a subcatchment. I have semi-automatically tried to calibrate catchment width, slope, Manning's n for pervious and impervious, depression storage for pervious and impervious. I came up with a flow curve shape which looks like the measured flow but the modelled flow is starting 30min earlier. I tried to change many of those parameters I described but still I can not reduce the 30min gap. Since it is a very small catchment I don't think this is due to spatial distribution of rainfall. So any other  idea why modelled flow starts 30min before measured?

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1 Reply · Reply by Robert Dickinson Mar 20

underground LID modeling

Hi everybody, if anyone can help me with this: How can I develope in SWMM5, an infiltration facility (like infiltration trench, or better, like a linear - not spot  soakway) which is located underground (which means it does not receive rainfall itself but only runoff is directed into it). Thank you in advance.

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2 Replies · Reply by Pan Ka Mar 12

Infiltration trench parameters

Hello, I am modifying the LID controls from the text editor to perform a sensitivity analysis What is the meaning of the fifth parameter assigned to infiltration trench surface layer and the fourth parameter to underdrain layer? [LID_CONTROLS];; Type/Layer Parameters;;-------------- ---------- ----------IT-0.5%   ITIT-0.5%   SURFACE   0            0          0.25       0.5      5IT-0.5%   STORAGE   2000    0.67    40          0 IT-0.5%   DRAIN        0            0.5       0            6 Thank you.

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5 Replies · Reply by Eugenia Mar 6

How do SWMM simulate the infiltration and exfiltration from a river ?

Hello, everyone, I study a area which always occurs infiltration in dry-weather and exfiltration in wet-weather, for there is a stream nearby the sewer. When the level of the stream is higher than that of the sewer, it happens the infiltration, otherwise the exfiltration happens.  So if there is a proper way to simulate the process of the infiltration and exfiltration ? I can set a pipe between the junction and the stream, but how to describe a stream in SWMM ? and how to set the level of the stream? Thank you!

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1 Reply · Reply by Robert Dickinson Feb 26

The SWMM 5 C Code for Most SWMM 5 Versions

The SWMM 5 C Code for Most SWMM 5 Versions The C code is in the zipped files - the prefix of the zip file denotes the version v13 for example is EPA SWMM 5.0.013 v3epaswmm5_engine.zip v5 epaswmm code  engine005b.zip v8epaswmm5_engine.zip v10epaswmm5_engine.zip v11epaswmm5_engine.zip v12epaswmm5_engine.zip v13epaswmm5_engine.zip v14epaswmm5_engine.zip v15epaswmm5_engine.zip v16epaswmm5_engine.zip v17epaswmm5_engine.zip v18epaswmm5_engine.zip v19epaswmm5_engine.zip v22epaswmm5_engine.zip swmm51001_engine.zip swmm51002_engine.zip swmm51003_engine.zip swmm51006_engine_0.zip swmm51007_engine_0.zip

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Time adjusted rule for orifice setting

I want to control opening and closing of an orifice depending on the flow in a downstream link. I want to close the orifice for 15min if the flow in the d/s exceeds say 50 LPS, after 15 min I want to check again the flow in the link and adjust the opening-closing of the orifice depending on the flow above-below 50LPS. How can I writet a rule which can solve this problem?

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3 Replies · Reply by MeHa Feb 26

Turbulence in simulation result

Hi, everyone,  I use dynamic wave to simulate a piece of pipe network, and I set up the outfall boundary to time series which I measured several months ago.  The outfall  boundary is surcharged when it rains. But after the simulation, I find the total inflow of the node nearby the outfall is violent turbulence. I wonder why it is caused and how can it be solved ?  figure 1  the depth of the node nearby the outfall, which is approach the measured value figure 2 the total inflow of the node in the node nearby the outfall, which is violent turbulence.  figure 3 the outfall boundary I set up, which is actual observed value.  anyone can help ?  thanks a lot . 

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2 Replies · Reply by Mingkai Zhang Feb 12

the successful way to combine MATLAB with SWMM

Hi everyone,  I found there were many questions about how to call SWMM in matlab, and this problem has bothered me for a long time.  Now I find a way to combine MATLAB with SWMM, it solve my problem, and I want to share with your guys .  The principle is to read and change .inp file of SWMM, and call swmm in MATLAB, then read the .rpt file to import data to matlab workspace.  The step and the main command are like below: 1. use  the command 'textscan' in matlab to read .inp file, the result will be a cell, then use  'strcmp' to find the exact section you care about, then use ' textscan' again to read the each line of the cell of the exact section which you want to change.   2. use 'fprintf' to rewrite the parameters into the .inp file. (Notice: format control, make sure the length of string is equal to the original ) 3.  ! swmm5.exe  test.inp  test.rpt ( this is a command to call external programs, you need change the name of the inp & rpt file into whatever you want )  4. the detial…

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MatLab and SWMM5

the successful way to combine MATLAB with SWMM

Hi everyone,  I found there were many questions about how to call SWMM in matlab, and this problem has bothered me for a long time.  Now I find a way to combine MATLAB with SWMM, it solve my problem, and I want to share with your guys .  The principle is to read and change .inp file of SWMM, and call swmm in MATLAB, then read the .rpt file to import data to matlab workspace.  The step and the main command are like below: 1. use  the command 'textscan' in matlab to read .inp file, the result…

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0 Replies

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, 2014

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, 2014

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, 2014

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

SWMM5 Forums

Lumped catchment reacts too fast

I lumped my catchment - disregarding the details of the sewer nework and repalacing it with an equivalent subcatchment -  but it offten reacts faster than the detailed sewer network model. Any research or idea on this? I tried to include a  link down stream of the subcatchment which improved the fit between detailed and lumped model.

Read more…
0 Replies

Combine two SWMM projects

Hi, I have a SWMM project representing one catchment, I want to add another SWMM project (of another nearby catchment produced separately) inorder to have a combined project representing both catchments. What is the best way to do this? Do I have to edit the .inp file manually?

Read more…
2 Replies · Reply by MeHa on Thursday

Parameter for 'delaying' modelled flow

Hi, I am trying to calibrate a subcatchment. I have semi-automatically tried to calibrate catchment width, slope, Manning's n for pervious and impervious, depression storage for pervious and impervious. I came up with a flow curve shape which looks like the measured flow but the modelled flow is starting 30min earlier. I tried to change many of those parameters I described but still I can not reduce the 30min gap. Since it is a very small catchment I don't think this is due to spatial…

Read more…
1 Reply · Reply by Robert Dickinson Mar 20

The SWMM 5 C Code for Most SWMM 5 Versions

The SWMM 5 C Code for Most SWMM 5 Versions The C code is in the zipped files - the prefix of the zip file denotes the version v13 for example is EPA SWMM 5.0.013 v3epaswmm5_engine.zip v5 epaswmm code  engine005b.zip v8epaswmm5_engine.zip v10epaswmm5_engine.zip v11epaswmm5_engine.zip v12epaswmm5_engine.zip v13epaswmm5_engine.zip v14epaswmm5_engine.zip v15epaswmm5_engine.zip v16epaswmm5_engine.zip v17epaswmm5_engine.zip v18epaswmm5_engine.zip v19epaswmm5_engine.zip v22epaswmm5_engine.zip…

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0 Replies

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…

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3 Replies · Reply by Robert Dickinson Nov 22, 2014

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, 2014

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, 2014

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, 2014

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.
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                           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 InfoWorks ICM and ICM SE.

InnovyzeRobert Widget

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.
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Important News about the current SWMM 5.1

Activity

MeHa posted a discussion
I lumped my catchment - disregarding the details of the sewer nework and repalacing it with an equivalent subcatchment -  but it offten reacts faster than the detailed sewer network model. Any research or idea on this? I tried to include a  link dow…
Thursday
MeHa replied to MeHa's discussion Combine two SWMM projects
"Thanx. How easy it is!"
Thursday
Robert Dickinson replied to MeHa's discussion Combine two SWMM projects
"I just did an experiment and I was able to just combine  the two files without any editing to  make a viable SWMM 5.1 file.  I just appended the one inp file to the other inp file."
Wednesday
MeHa posted a discussion
Hi, I have a SWMM project representing one catchment, I want to add another SWMM project (of another nearby catchment produced separately) inorder to have a combined project representing both catchments.What is the best way to do this? Do I have to…
Wednesday
Robert Dickinson replied to MeHa's discussion Parameter for 'delaying' modelled flow
"What is your rainfall time step interval?  Is it 30 minutes?  Have you tried to reduce the Wet Hydrology time step or start the simulation 1/2 hour earlier?  SWMM 5 does not compute the initial time step but only  lists the time step after a the rep…"
Mar 20
MeHa posted a discussion
Hi, I am trying to calibrate a subcatchment. I have semi-automatically tried to calibrate catchment width, slope, Manning's n for pervious and impervious, depression storage for pervious and impervious. I came up with a flow curve shape which looks…
Mar 20
Alejandra Patricia Munoz Munoz left a comment for Alejandra Patricia Munoz Munoz
"Thanks!"
Mar 13
Robert Dickinson left a comment for Alejandra Patricia Munoz Munoz
"Welcome Patricia!"
Mar 13
Alejandra Patricia Munoz Munoz is now a member of SWMM5 - Stormwater Management Model
Mar 13
Pan Ka’s discussion was featured
Hi everybody,if anyone can help me with this:How can I develope in SWMM5, an infiltration facility (like infiltration trench, or better, like a linear - not spot  soakway) which is located underground (which means it does not receive rainfall itself…
Mar 13
Pan Ka replied to Pan Ka's discussion underground LID modeling
"Thank you very much Robert.
Yes, it is a promising option. However, it seems that it increases actually the total study area. I cannot think now if this can cause any side effect to the calculations or to the interpreattions of the results, but I wi…"
Mar 12
Robert Dickinson replied to Pan Ka's discussion underground LID modeling
"I think you can do the folllowing:
1. Have a Subcatchment with 100 percent coverage of your LID
2. Have the Subcatchment use a zero rainfall time series
3. Connect to the Subcatchment with  a trench to an upstream Subcatchment with Runoff

I hope th…"
Mar 11
Pan Ka posted a discussion
Hi everybody,if anyone can help me with this:How can I develope in SWMM5, an infiltration facility (like infiltration trench, or better, like a linear - not spot  soakway) which is located underground (which means it does not receive rainfall itself…
Mar 10
Robert Dickinson left a comment for Maeenul Islam
"Welcome Maeenul!"
Mar 10
Maeenul Islam commented on MeHa's blog post ArcGIS data into SWMM
"Although the question is old enough, it may help someone in future. GeoSWMM is a SWMM tool developed over ArcMap as a plugin. The full modeling is identical with SWMM5. You can create a complete swmm model over ArcMap using GeoSWMM by importing data…"
Mar 9
Maeenul Islam is now a member of SWMM5 - Stormwater Management Model
Mar 9
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What are the link and node time steps used by SWMM 5 with Variable Time Stepping
Complete Survey of the dialogs in H2OMap Sewer
How to Use the External Tool Command in SWMM 5 to read the input and output files of SWMM 5
SWMM5 Code Viewer from CHI
How to Use the Arc Toolbox Append Tool With InfoSWMM 2D
How to Use a Text Editor to Combine Two SWMM5 Files
New Import of Tags from SWMM 5 to InfoSWMM and H2OMap SWMM
Custom Link Shapes in SWMM5

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