Area Scaling Factor in #INFOSWMM and #H20MAPSWMM

Note: Area Scaling Factor in #INFOSWMM and #H20MAPSWMM  is needed if you want to update the DB from the Map after drawing a Subcatchment. The Auto Area Calculation Flag has to be turned on for this to work. Why did I write this blog? The USA conversion is really hard to remember!

2.295684113865932e-5  Area Scaling Factor for USA Units

0.0001                                Area Scaling Factor for SI Units                         

New work from Olafur Eliasson: he installed a huge riverbed in a Danish museum

New work from Olafur Eliasson: he installed a huge riverbed in a Danish museum http://t.co/dDKPxZSTDs pic.twitter.com/H2gdBYKh6U
— Robert E Dickinson (@RDickinson) August 24, 2014

Tweets about InfoWorks ICM from RDICKINSON

What is this blog post about?  It is a visual widget to my tweets on  InfoWorks ICM from the twitter person RDICKINSON  Why do I use Twitter?  I first started using twitter in 2008 thanks to our daughter @boonsri and my love of timelines.

Tweets about "@rdickinson icm"

Tweets about InfoSWMM from RDICKINSON

What is this blog post about?  It is a visual widget to my tweets on InfoSWMM from the twitter person RDICKINSON  Why do I use Twitter?  I first started using twitter in 2008 thanks to our daughter @boonsri and my love of timelines.  My goal is to reach 100,000 tweets if I last long enough and Twitter lasts enough years.  I would have over 100,000 tweets now if I had started in 1980 and tweets were possible in the  80's

Tweets about "infoswmm"

Questions after a Main Break | Webinar on Smart Asset Planning

Questions after a Main Break | Webinar on Smart Asset Planning Water main breaks are prevalent in all cities.  As engineers and planners, we do everything we can to avoid them and mitigate damages when they occur.  Communicating those plans and educating the general public is another story.  Having a clearly defined and defensible rehabilitation plan is the foundation for better education of stakeholders.  They want to know: Why did this water main fail?  What was the likelihood of this water main to fail?  Was there an assessment (financial, environment, and social) on this pipe failing?  Was this pipeline planned to be repaired/upgraded in the near future? Take a look at a sampling of news stories in the last week regarding main breaks.  Is your utility prepared?

Join Innovyze for a free webinar on Wednesday, September 17th, 2014 for a technology update for risk-driven asset planning solutions, and will discuss how utilities are utilizing these toolsets to better manage risk of failure and maximize the value of aging assets. People who attend this webinar will be able to understand the following items regarding proactive asset planning practices (featuring InfoMaster*): 1.        More accurately estimate lifetimes (remaining useful life) of pipes and failure potential 2.        Systematically assess consequences of pipeline failures 3.        Methods for proper budgeting including targeted approach to rehabilitation, repair and renewal planning. Click here to reserve your spot.  Spaces are limited.  Should you want to view a presentation sooner or talk to an Innovyze representative, please click here. Please forward this invitation to your colleagues who may be interested in attending.  Thanks. About Innovyze Innovyze is a leading global provider of wet infrastructure business analytics software solutions designed to meet the technological needs of water and wastewater utilities, government industries, and engineering organizations worldwide. Its clients include the majority of the largest UK, Australasia and North American cities, foremost utilities on all five continents, and ENR top-rated design firms. With unparalleled expertise and offices in North America, Europe, and Asia Pacific, the Innovyze connected portfolio of best-in-class product lines empowers thousands of engineers to competitively plan, manage, design, protect, operate and sustain highly efficient and reliable infrastructure systems, and provides an enduring platform for customer success. For more information, call Innovyze at +1 626-568-6868, or visit www.innovyze.com.

Oscillations in SWMM 5 and InfoSWMM

I made this example to show how oscillations occur for legitimate reasons and the best ways to test the oscillations in InfoSWMM and SWMM 5:

Oscillations due to downstream obstructions, downstream mixed solutions and downstream boundary conditions:

In this case the oscillation in some links is due to the culvert comparison which limits the flow based on the inlet equation.  You can see the flow changes if you turn on show control actions in the run manager.  The program will then show the changes in the HTML report file.  The flow oscillation is due to the water being stored at the upstream node of the culvert followed by the excess flow going into the culvert.  

How to check  the validity of the solution:  Use a Map Display of the Link Result Variable Link Volume.  If you do a map display of the link total volume you will see that the total volume passing through each link is in balance.  You were using a 30 minute report time step, you can see and understand the oscillations better if you use a 1 minute report step.   In the culverts even though the flow in the culvert oscillates the mean flow is being passed downstream – that is why the downstream flows are constant.  I am trying a different way of modeling the steady state flow = this model does not have a continuity error but since the inflow to the culvert is oscillating between two solutions you are getting an uncertain flow.

Figure 1 Control Actions

Figure 2 Mass Balance