"At the Summit of Olympus Mons
Credit: G. Neukum (FU Berlin) et al., DLR, ESA
From martian orbit, the Mars Express cameras looked down on the largest volcano in the solar system. The result was this stunningly detailed overhead view of the…"
SWMM5 - Stormwater Management Model
SWMM 5, InfoSWMM, H20MAP SWMM, InfoSewer for Water Quality,Hydrology, Hydraulics
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Robert Dickinson replied to Robert Dickinson's discussion How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5?"Subject: Link Iterations in the SWMM 5 Dynamic Wave Solution
Each of the links in the SWMM 5 network can use up to 8 iterations to reach convergence during a time step in the dynamic wave solution of SWMM 5. The rules…"
Robert Dickinson left a comment for wu ze jian"Hi, I added this discussion http://swmm2000.com/forum/topics/how-is-the-st-venant-equation-solved-for-in-the-dynamic-wave-solu"
Robert Dickinson posted a discussionHow is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5?
Subject: How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5? An explanation of the four St. Venant Terms in SWMM 5 and how they change for Gravity Mains and Force Mains. The HGL is the water surface elevation in the upstream and downstream nodes of the link. The HGL for a full link goes from the pipe crown elevation up to the rim elevation of the node + the surcharge depth of the node. The four terms are: dq2 = Time Step * Awtd * (Head Downstream – Head Upstream)…See More
Robert Dickinson added a page to the group Hydraulics
Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow
Subject: Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow
You can model Force Main friction loss in InfoSWMM using either Darcy Weisbach or Hazen Williams as the full pipe friction loss method (see Figure 1 for the…
Robert Dickinson's blog post was featuredSWMM 5 Precipitation Options
Subject: SWMM 5 Precipitation Options You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative precipitation, use both rainfall and snowfall in the same rain gage depending on temperature, use both time series or external files for the rain gage and have unlimited rain gages with the limitation of one rain gage per subcatchment. …See More
Robert Dickinson posted a blog postSWMM 5 Precipitation Options
Subject: SWMM 5 Precipitation Options You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative precipitation, use both rainfall and snowfall in the same rain gage depending on temperature, use both time series or external files for the rain gage and have unlimited rain gages with the limitation of one rain gage per subcatchment. …See More
Robert Dickinson commented on Robert Dickinson's group Stream of Information"Pacheena Indian Reserve, British Columbia, Canada
May. 25, 2012
"
Robert Dickinson commented on Robert Dickinson's group Stream of Information"All the Water on Europa Illustration Credit & Copyright: Kevin Hand (JPL/Caltech), Jack Cook (Woods Hole Oceanographic Institution), Howard Perlman (USGS)
Explanation: How much of Jupiter's moon…"
Robert Dickinson commented on Robert Dickinson's group Water Quality"URBAN STORMWATER QUANTITY/QUALITY MODELING USING THE SCS METHOD AND EMPIRICAL EQUATIONS†
http://onlinelibrary.wiley.com/doi/10.1111/j.1752-1688.1997.tb04093.x/abstract
May 24, 2012
Wiley Online Library will be disrupted on 26 May from…"
Robert Dickinson commented on Robert Dickinson's group Water Quality"Hi MeHa, Here is one good source of data, I also have the SWMM 5 models for the USGS areas.
http://www.1000friendsofflorida.org/pubs/stmarksgreen/apend4.asp
http://sofia.usgs.gov/publications/ofr/78-324/ofr-78-324.pdf
"
MeHa commented on Robert Dickinson's group Water Quality"I want to model WQ of sewers. Can any body provide me a network with real measured calibration files? "
MeHa posted a status"Hello, When designing a sewer system, we consider the Node Flooding and Conduit surcharge in the status report. Is there any guideline which"
Quah Soon Tong left a comment for Esther Bergareche Auricenea"Hi Esther, I am not sure you are the same Esther that was at the United World College in South Wales with me. I am Quah Soon Tong from Singapore. I noticed you are also an engineer. I did Civil Engineering at Cambridge University, but practised as…"
Robert Dickinson commented on Robert Dickinson's group Stream of Information"River Canyon
May. 23, 2012
"
Robert Dickinson commented on Robert Dickinson's group Stream of Information"Litla Dimun, Faroe Islands
May. 23, 2012
"
Asaph Mercy Kabaasha's Discussions
Peak Flows After Reopening an Orifice.
Started this discussion. Last reply by Robert Dickinson Jan 13. 2 Replies 0 Likes
Hello Members,In this network…Continue
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Robert Dickinson replied to Asaph Mercy Kabaasha's discussion Instability after Orifice Close in the group Hydraulics
"Hi, I do not see this as an issue in SWMM 5.0.022 I noticed your data file had the extension of .out instead of .inp Here is my result, the flow in the orifice closes and the flow is affected downsream
"
Asaph Mercy Kabaasha replied to Asaph Mercy Kabaasha's discussion Instability after Orifice Close in the group Hydraulics
"Hello,
Yes. See attachment for input file. Thanks."
Robert Dickinson replied to Asaph Mercy Kabaasha's discussion Instability after Orifice Close in the group Hydraulics
"Hi, Do you have an input file to test?"
Asaph Mercy Kabaasha added a discussion to the group Hydraulics
Instability after Orifice Close
In the above picture, an orifice connected to this link (at almost 2000m) was closed at 6hrs and reopened at 12hrs. Flow in this link between the time when the orifice is closed looks unstable. I have tried the following;"hotstart files",ignoring the inertial terms,reducing the routing time to 0.5 seconds but all have…See More
Asaph Mercy Kabaasha left a comment for Robert Dickinson
"Thanks a lot Robert for your quick response. Probably my question was not clear. In fact reading the report I had referenced earlier, you find this term:which is exactly what you answered. So I was wondering why that term (Bed Slope) was not shown…"
Robert Dickinson left a comment for Asaph Mercy Kabaasha
"Hi, The bed slope is part of the water surface slope or the term dq2 in SWMM 5.
// --- 2. energy slope term dq2 = dt * GRAVITY * aWtd * (h2 - h1) / length
where h1 = node depth + node invert elevation upstream and
…"
Asaph Mercy Kabaasha posted a blog post
Bed Slope in the Momentum Equation used by SWMM
Hello,In the STORM WATER MANAGEMENT MODEL QUALITY ASSURANCE REPORT: Dynamic Wave Flow Routing, the momentum equation is written as: I don't know why the term for the "Bed Slope" is left out in this equation, as it is the friction slope and the local losses taken care of.Any information on why this term is left out would be…See More
Robert Dickinson left a comment for Asaph Mercy Kabaasha
"The numerical solution is a point iteration process
http://swmm2000.com/profiles/blogs/lambda-calculus-in-the-swmm-5-dynamic-wave-solution"
Asaph Mercy Kabaasha posted a status
"Hello,
What Numerical Scheme does SWMM use to solve the Saint Venant Equations?"
Robert Dickinson replied to Asaph Mercy Kabaasha's discussion Peak Flows After Reopening an Orifice.
"You can also see this if you save the results every 1 second and plot the heads and the flows - the head difference drives the flows
"
Robert Dickinson replied to Asaph Mercy Kabaasha's discussion Peak Flows After Reopening an Orifice.
"Hi, When you open up the orifice there is a large head difference between the upstream and downstream ends of the orifice - the large head difference is the cause of the spike. See the two images below:
"
Asaph Mercy Kabaasha replied to Asaph Mercy Kabaasha's discussion NOT FUNCTIONING CONTROLS IN SWMM 5.0 in the group Hydraulics
"great thanks. i have got the logic.
"
Robert Dickinson replied to Asaph Mercy Kabaasha's discussion NOT FUNCTIONING CONTROLS IN SWMM 5.0 in the group Hydraulics
"i had this result with a small change - adding greater than or equal to - it might not have worked for you if the current elapsed time was never EXACTLY equal to 8 hours.
********************* Control Actions Taken *********************…"
Asaph Mercy Kabaasha added a discussion to the group Hydraulics
NOT FUNCTIONING CONTROLS IN SWMM 5.0
Hello Members,I have a small network SWMM_EXERCISE.zipIn this network the orifice should close at 8 and open again at 10. To my surprise the controls are not picked up. What could be the problem since the control statements are well written.Thanks in Advance.See More
Asaph Mercy Kabaasha replied to Asaph Mercy Kabaasha's discussion Opening a "hotstart" file in the group Hydraulics
"Robert,
Any links to such utility (if at all they can be found) would be so helpful.
Thx.
"
Robert Dickinson replied to Asaph Mercy Kabaasha's discussion Opening a "hotstart" file in the group Hydraulics
"It unfortunately, is a binary file and not a text file. We really should have a way of printing it out as we did in SWMM 4. I think a small utility can be made to convert it text. "
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- I am a Civil Engineer but currently doing a Masters Degree in Urban Water Engineering and Management at the UNESCO-IHE Institute for Water Education/Delft/Netherlands.
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Asaph Mercy Kabaasha's Blog
Bed Slope in the Momentum Equation used by SWMM
Posted on March 19, 2012 at 4:30pm 0 Comments 0 Likes
Hello,
In the STORM WATER MANAGEMENT MODEL QUALITY ASSURANCE REPORT: Dynamic Wave Flow Routing, the momentum equation is written as:
I don't know why the term for the "Bed Slope" is left out in this equation, as it is the friction slope and the local losses taken care…
Continue Simulating a "shut off" or "closed" conduit in SWMM
Posted on November 24, 2011 at 3:47pm 0 Comments 0 Likes
Hello Members,
Though not a common practice in drainage systems, I was trying to simulate a "closed" or "shut off" pressurized conduit in SWMM5 to see the effect it would have to the performance of the whole system.
I am using an ORIFICE whereby a discharge coefficient of "0" represents a closed ORIFICE hence a closed (no fluid passing through) conduit and discharge coefficient of…
Priessmann slot width in SWMM 5
Posted on September 30, 2011 at 4:45pm 2 Comments 0 Likes
Hello,
Since in the current version of SWMM doesn't allow the user to change the width of the Priessmann slot, I would like to know how EPASWMM really develops that value for different simulations or whether it's a constant value.
Integrating EPASWMM hydraulic engine with EPANET GUI
Posted on September 3, 2011 at 5:30am 2 Comments 0 Likes
I have been using EPANET and EPASWMM for a short period of time now, but for the short time I have used these tools, I have realised that as much as EPANET is used in modeling water distribution systems, it doesn't have the capability to simulate TRANSIENT CONDITIONS that are common in most of our developing countries.
At the same, EPASWMM though used in modeling drainage systems, it has that capability of doing HYDRAULIC TRANSIENT ANALYSIS!!!
So I was thinking of integrating the…
Comment Wall (3 comments)
- At 4:55pm on March 19, 2012,
Robert Dickinson said… Hi, The bed slope is part of the water surface slope or the term dq2 in SWMM 5.
// --- 2. energy slope term
dq2 = dt * GRAVITY * aWtd * (h2 - h1) / lengthwhere h1 = node depth + node invert elevation upstream and
h2 = node depth + node invert elevation downstream
- At 9:36am on March 13, 2012, Robert Dickinson said…
The numerical solution is a point iteration process
http://swmm2000.com/profiles/blogs/lambda-calculus-in-the-swmm-5-dynamic-wave-solution
- At 3:40am on October 17, 2011,
Mpafane said… Yeah, you are right but I have not be an active member... now I am gonna try to be a good one.. Thanks
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