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This sketch summarizes what happens in a SWMM 5 Subcatchment for Horton Infiltration during a storm event:
1. The event starts out with the potential infiltration rate at the maximum infiltration rate but
2. Decay starts happening right away and the potential infiltration rate starts decreasing until it reaches the minimum infiltration rate (assuming the storm last long enough),
3. The actual infiltration rate is the minimum of the rainfall rate or the potential infiltration rate,
4. Using the Huff distributions for rainfall the runoff does not start happening until the rainfall rate exceeds the potential infiltration rate in these models
5. The runoff ceases after the rainfall rate becomes less than the current potential infiltration rate later in the storm,
6. The maximum infiltration volume for Horton caps the storm event infiltration at 10 mm in this example, the infiltration will cease when the cumulative infiltration reaches 10 mm.
7. Horton Iniltration is a five parameter method
a. Maximum infiltration rate in mm/hour
b. Minimum infiltration rate in mm/hour
c. Decay rate for the change from maximum to minimum infiltration rate
d. Regeneration rate for the change from minimum to maximum infiltration rate after the storm event ends and
e. A maximum infiltration volume per storm event in millimeters
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Innovyze Releases InfoWorks ICM Generation V3.0; Continuing to Set the Standard for Smart Integrated Catchment Modeling HEC-RAS Imports, Advanced Water Quality, Improved Results Analysis, and Performance Enhancements Highlight New Features | |||||
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Broomfield, Colorado USA, August 21, 2012 — Innovyze, a leading global innovator of wet infrastructure modeling and simulation software and technologies, today announced the release of the V3.0 Generation ofInfoWorks ICM, a comprehensive urban drainage modeling solution that enables users to work more efficiently and get the reliable information they need to make better design and operational decisions for optimal performance. Since its release, InfoWorks ICM has rapidly become the solution of choice for integrated river, sewer and overland flow modeling among utilities, municipalities, local authorities and their consultants around the world. InfoWorks ICM V3.0 incorporates many of the features requested by its worldwide customer base—a clear indication of the Innovyze commitment to providing its users significant value and competitive advantages while quickly responding to their needs. A hallmark of InfoWorks ICM is its dynamic integration of one-dimensional (1D) hydrodynamic simulation of flows in rivers, open channels and pipe networks and two-dimensional (2D) hydrodynamic simulation of surface flooding in the urban environment and river floodplain. The combination provides a powerful solution for simultaneously modeling below-ground and above-ground elements of catchments to accurately represent all flow paths and improve understanding of processes occurring in the holistic environment. The software also takes interactions of natural and man-made environments into account and effectively simulates the impact of polluting runoff and effluent from urban areas on water quality. Such advanced capabilities give water utilities greatly enhanced capabilities for predicting flood risks; supporting cost-effective drainage design and management; developing online urban flooding forecasts; conceiving and evaluating sound and reliable urban catchment strategies such as storm sewer separation, active real-time control and provision of adequate additional storage; and improving drainage system operation. InfoWorks ICM V3.0 now allows users to import river models directly from the United States Army Corp of Engineers (USACE) HEC-RAS program, allowing for easier transition of ongoing projects. The importer allows cross sections, interpolated sections, river reaches, storage areas, lateral structures and portions of bridge objects. The new version expands its water quality analysis capabilities with the ability to model algae, macrophytes, silicate, absorbed phosphorus, solar radiation, and detrital pollutants. Users may also import and export pollutographs directly in to the model. To improve results analysis InfoWorks ICM V3.0 now supports inclusion of network results point, lines, and polygons within both the 1D and the 2D network. New SQL querying functions and annotation options also increase results presentation flexibility. The new version also includes performance enhancements to allow simulations to start from a previous saved state, wider GPU functionality application, and compression of 2D mesh zones. For a complete list of new features, visit the “What’s New” section of the online help for InfoWorks ICM V3.0. “Our customers’ wants and needs are a top priority for Innovyze and we relentlessly innovate for them. We continue to delight our customers and develop advanced smart modeling features, functionality, and simulation capabilities that will help them drive their businesses to higher efficiency and productivity—all while making their work simpler, easier and more enjoyable,” said Paul F. Boulos, Ph.D., BCEEM, Hon.D.WRE, Dist.D.NE, F.ASCE, President and Chief Operating Officer of Innovyze. “InfoWorks ICM has set new standards and continues to evolve, giving engineering professionals the most advanced and comprehensive toolset for planning, designing, operating and sustaining safe and reliable drainage systems that effectively protect public health and our waterways.” | |||||
Learning To Think
by Zoë Pollock
Verlyn Klinkenborg's advice to young writers:
Before you learn to write well, to trust yourself as a writer, you will have to learn to be patient in the presence of your own thoughts. You’ll learn that making sentences in your head will elicit thoughts you didn’t know you could have. Thinking patiently will yield far better sentences than you thought you could make.
I’m repeatedly asked how I write, what my “process” is. My answer is simple: I think patiently, trying out sentences in my head. That is the root of it. What happens on paper or at the keyboard is only distantly connected. The virtue of working this way is that circumstances — time, place, tools — make no difference whatsoever. All I need is my head. All I need is the moments I have.
Subject: SWMM 5 Weir RTC Rules
This example SWMM 5 model closes a weir based on the depth at the upstream node of the Weir every 0.25 feet. You can see the effect of the RTC rules using a Scatter plot of Weir Flow versus Weir Depth in SWMM 5 (Figure 1). The Weir flows normally every 0.25 feet but shuts down three times using these rules which set the Weir Setting to 0.0
RULE Weir100
IF Node WeirNode Depth > 1.75
AND Node WeirNode Depth
THEN WEIR WEIR Setting = 0.0
Priority 2
RULE Weir101
IF Node WeirNode Depth > 2.25
AND Node WeirNode Depth
THEN WEIR WEIR Setting = 0.0
Priority 2
RULE Weir102
IF Node WeirNode Depth > 2.75
AND Node WeirNode Depth
THEN WEIR WEIR Setting = 0.0
Priority 2
RULE Weir103
IF Node WeirNode Depth > 3.25
AND Node WeirNode Depth
THEN WEIR WEIR Setting = 0.0
Priority 2
RULE Weir104
IF Node WeirNode Depth > 3.75
AND Node WeirNode Depth
THEN WEIR WEIR Setting = 0.0
Priority 2
Figure 1. Scatter Graph of Weir flow versus Weir Node Depth.