Subject: The Pump summary table of SWMM
The pump summary table at the end of the SWMM 5 report file has two columns for the time off the pump curve BUT the two columns are only informative if the pump is a type 4pump. If the pump type is 1, 2 or 3 then the low column is always 0 and when the volume, depth or head is either below the lowest point in the point curve or above the highest point in the pump curve the pump summary table lists the time off either low or high in the High column.
xMin is the 1st point in the pump curve for either volume, depth, head or depth, respectively for pump1, pump2, pump3 and pump4 type pumps
xMax is the last point in the pump curve for either volume, depth, head or depth, respectively for pump1, pump2, pump3 and pump4 type pumps
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Autodesk Technologist with Information about Stormwater Management Model (SWMM) for watershed water quality, hydrology and hydraulics modelers (Note this blog is not associated with the EPA). You will find Blog Posts on the Subjects of SWMM5, ICM SWMM, ICM InfoWorks, InfoSWMM and InfoSewer.
Saturday, April 14, 2012
The Pump summary table of SWMM5.0.022 and the Percent Time off Columns
Saturday, January 28, 2012
Output Statstics Manager to find negative flows in InfoSWMM
ubject: Output Statstics Mana
Output Statstics Manager to fi
1. Pipe Features
2. Use a Domain with your force mains
3. Select Flow
4. Event Dependent
5. Total – NOT Mean or Peak to find the negative and positive flows
6. Large NEGATIVE Flow Threshold
7. Large NEGATIVE Volume Threshold
8. Zero for Interevent Time to pick up all values
9. You will get a table that shows you the minimun flows, and a histogram of the flows
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Friday, August 5, 2011
Example VSP Pump in SWMM 5 - Version 1
Here is one way to model multiple pumps between the same downstream and upstream nodes using the pump curves and the Real Time Control Rules (RTC) in SWMM 5. Here are the steps:
1. Enter the data for three pumps in the browser by using the Add Pump Icon
2. Enter three Pump Head/Flow Curves so that the 2nd and 3rd Pump Curves are the sum of the flows in the 1st and 2nd Pumps together and the sum of the flows in the 1st, 2nd and 3rd respectively for the 2nd and 3rd Pump Curves
4. Enter a RTC Rule in the Control Editor so that when the 2nd Pump is turned on – the 1st and 3rd Pump is turned off
5. Enter a RTC Rule in the Control Editor so that when the 3rd Pump is turned on – the 1st and 2nd Pump is turned off
Using these rules you can see that for the 1st Pump turns on when the Node WetWell has a depth below 2 feet, the 2nd Pump turns on when the Node is between a depth of 2 to 5 feet and the 3rd Pump turns on when the Node Depth is above 5 feet.
RULE Pump1
IF Node WetWell Depth <= 2
THEN PUMP PUMP2 STATUS = OFF
AND PUMP PUMP3 STATUS = OFF
Priority 1
RULE Pump2
IF Node WetWell Depth > 2
AND Node WetWell Depth <= 5
THEN PUMP PUMP1 STATUS = OFF
AND PUMP PUMP3 STATUS = OFF
Priority 2
RULE Pump3
IF Node WetWell Depth > 5
THEN PUMP PUMP1 STATUS = OFF
AND PUMP PUMP2 STATUS = OFF
Priority 3
Sunday, July 10, 2011
InfoSWMM Report Manager and Field Statistics
Subject: InfoSWMM Report Mana
You can also use the mixed graph feature to plot the pump flow and the downstream flows on the same graph. If you click on the Report command then you can also use aField Statistics command to see the Statistics for each Link and Pump. The right mouse button for the Report also allows you to make a scatter plot and graph the flows in theforcemains versus the flows in the pumps.
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How to use the Report Feature of the HGL Plot in InfoSWMM
Subject: How to use the Report Feature of the HGL Plot in InfoSWMM
The report feature of the HGL plot helps you understand in more detail the pump flows, forcemain flows and node heads.
Step 1. Load the Domain in the HGL Plot using Report
Step 2. Click on the Report Command to Show the HGL Data in Tabular Format
Step 3. Format the Results Table from the HGL Plot to see the data better.
Step 4. Now we have the heads, flows and velocities for the pumps, nodes and force main links in our Domain around the pump of interest at time steps of 2 seconds, We can now see how the flows, heads and velocities change downstream from the pump.
Step 5. Force Mains, Nodes and Pumps in our Table
Step 6. The pump turns on and the flow moves downstream to the force mains – the heads in the nodes increase to balance the flow at each node. As you can see there is a 1 to 2 GPM decrease due to attenuation as the flow from the pump moves into the force mains.
Step 7. The pump turns off and flows downstream decrease. You can get negative flow if the downstream head is higher than the upstream head of the link.
Step 8. Use Advanced Labeling and the HGL Plot Stepping Interval to see all of the data in your Plot.
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InfoSWMM and H2OMAP SWMM Pump Summary Table
Subject: InfoSWMM Pump Summa
The Pump Summary Table in Report Manager tells you how often the pumps turn on (Start-Up Count), the percent of the simulation time it was used (Percent Utilized) and the maximum, minimum and average flow for the pumps.
You can also see flows in the downstream links from the pumps in the force mains along with the pumps.
If you use the Mixed Graph Control you see the Pump flows and Link Flows on the same Graph
You can control the replay of the HGL Plot by altering the stepping time in Graph Settings
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Thursday, June 23, 2011
SWMM 5 Clocktime RTC Rules for Pumps, Weirs and Orifices
You can use the Control or RTC rules in SWMM 5 to adjust the settings of the weirs, pumps and orifices based on the clock time each day of your simulation. Here is an example that will adjust orifice height every ½ hour for 7 orifices at one time using two sets of rules.
RULE R1a
; Half hour setting
IF SIMULATION CLOCKTIME = 0:30:00
OR SIMULATION CLOCKTIME = 1:30:00
OR SIMULATION CLOCKTIME = 2:30:00
OR SIMULATION CLOCKTIME = 3:30:00
OR SIMULATION CLOCKTIME = 4:30:00
OR SIMULATION CLOCKTIME = 5:30:00
OR SIMULATION CLOCKTIME = 6:30:00
OR SIMULATION CLOCKTIME = 7:30:00
OR SIMULATION CLOCKTIME = 8:30:00
OR SIMULATION CLOCKTIME = 9:30:00
OR SIMULATION CLOCKTIME = 10:30:00
OR SIMULATION CLOCKTIME = 11:30:00
OR SIMULATION CLOCKTIME = 12:30:00
OR SIMULATION CLOCKTIME = 13:30:00
OR SIMULATION CLOCKTIME = 14:30:00
OR SIMULATION CLOCKTIME = 15:30:00
OR SIMULATION CLOCKTIME = 16:30:00
OR SIMULATION CLOCKTIME = 17:30:00
OR SIMULATION CLOCKTIME = 18:30:00
OR SIMULATION CLOCKTIME = 19:30:00
OR SIMULATION CLOCKTIME = 20:30:00
OR SIMULATION CLOCKTIME = 21:30:00
OR SIMULATION CLOCKTIME = 22:30:00
OR SIMULATION CLOCKTIME = 23:30:00
THEN ORIFICE R1 SETTING = 0.90
AND ORIFICE R2 SETTING = 0.90
AND ORIFICE R3 SETTING = 0.90
AND ORIFICE R4 SETTING = 0.90
AND ORIFICE R5 SETTING = 0.90
AND ORIFICE R6 SETTING = 0.90
AND ORIFICE R7 SETTING = 0.90
RULE R1b
; hour setting
IF SIMULATION CLOCKTIME = 0:00:00
OR SIMULATION CLOCKTIME = 1:00:00
OR SIMULATION CLOCKTIME = 2:00:00
OR SIMULATION CLOCKTIME = 3:00:00
OR SIMULATION CLOCKTIME = 4:00:00
OR SIMULATION CLOCKTIME = 5:00:00
OR SIMULATION CLOCKTIME = 6:00:00
OR SIMULATION CLOCKTIME = 7:00:00
OR SIMULATION CLOCKTIME = 8:00:00
OR SIMULATION CLOCKTIME = 9:00:00
OR SIMULATION CLOCKTIME = 10:00:00
OR SIMULATION CLOCKTIME = 11:00:00
OR SIMULATION CLOCKTIME = 12:00:00
OR SIMULATION CLOCKTIME = 13:00:00
OR SIMULATION CLOCKTIME = 14:00:00
OR SIMULATION CLOCKTIME = 15:00:00
OR SIMULATION CLOCKTIME = 16:00:00
OR SIMULATION CLOCKTIME = 17:00:00
OR SIMULATION CLOCKTIME = 18:00:00
OR SIMULATION CLOCKTIME = 19:00:00
OR SIMULATION CLOCKTIME = 20:00:00
OR SIMULATION CLOCKTIME = 21:00:00
OR SIMULATION CLOCKTIME = 22:00:00
OR SIMULATION CLOCKTIME = 23:00:00
THEN ORIFICE R1 SETTING = 0.5
AND ORIFICE R2 SETTING = 0.5
AND ORIFICE R3 SETTING = 0.5
AND ORIFICE R4 SETTING = 0.5
AND ORIFICE R5 SETTING = 0.5
AND ORIFICE R6 SETTING = 0.5
AND ORIFICE R7 SETTING = 0.5
Saturday, June 18, 2011
3 Types of Manholes in SWMM 5 and InfoSWMM
InfoSWMM and Arc GIS Layer Properties for Force Mains and Gravity Mains
An important advantage of using InfoSWMM is the ability to use all of the Arc GIS layer and programming tools. For example, you can use the layer properties in the Table of Contents to color and create symbols for the force mains and gravity mains in InfoSWMM. The Force Main variable (which is a Yes/No parameter) is selected as the field value in the Symbology Tab of Layer Properties which allows you to color and size the link based on the Force Main property of is you do a Layer Join the link property and simulation results.
Friday, June 17, 2011
InfoSWMM Note About Pump Wet Wells
Wednesday, December 29, 2010
Force Main Friction Loss in SWMM 5
You can model Force Mains in SWMM 5 using either Darcy Weisbach or Hazen Williams as the full pipe friction loss method (see Figure 1 for the internal defintion of full flow). No matter which method you use for full flow the program will use Manning’s equation to calculate the loss in the link when the link is not full (see Figure 2 for the equations used for calculating the friction loss – variable dq1 in SWMM 5). Force Main Friction Loss in SWMM 5.
Figure 1. How the full pipe condition is defined in SWMM 5 |
Figure 2: Friction equations used in SWMM 5 for a Force Main.
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Friday, December 24, 2010
Non Linear Term in the Saint Venant Equation of SWMM 5
Friday, October 1, 2010
H2OMAP-Sewer - FM Split Issue
Note: One method would be to add a duplicate Wet Well/Pump/Force Main set of links to pass the flow from the upstream Force Main to the two downstream Force Mains (FM). The pump should be fixed capacity to handle all of the split GM flows. In this particular example the flows are split 50/50 to links 25 and 35 after leaving the loading manhole 24.
Pumps and Force Mains in InfoSWMM
Note: A pump is modeled in InfoSWMM somewhat akin to InfoSewer. You have a Wetwell connected to a Pump which in turn is connected to a Force Main. You can decide wheter a pipe is a Force Main or a Gravity Main by using the Atribute Browser and selecting Yes for Force Main and entering a FM Roughness.
You can also use the PickAx tool in the Attibrute Browser to convert the node from a Manhole to a WetWell / Storage node.
Saturday, January 23, 2010
Water Hits and Sticks: Findings Challenge a Century of Assumptions About Soil Hydrology
ScienceDaily (Jan. 23, 2010) — Researchers have discovered that some of the most fundamental assumptions about how water moves through soil in a seasonally dry climate such as the Pacific Northwest are incorrect -- and that a century of research based on those assumptions will have to be reconsidered.
A new study by scientists from Oregon State University and the Environmental Protection Agency showed -- much to the surprise of the researchers -- that soil clings tenaciously to the first precipitation after a dry summer, and holds it so tightly that it almost never mixes with other water.
The finding is so significant, researchers said, that they aren't even sure yet what it may mean. But it could affect our understanding of how pollutants move through soils, how nutrients get transported from soils to streams, how streams function and even how vegetation might respond to climate change.
The research was just published online in Nature Geoscience, a professional journal.
"Water in mountains such as the Cascade Range of Oregon and Washington basically exists in two separate worlds," said Jeff McDonnell, an OSU distinguished professor and holder of the Richardson Chair in Watershed Science in the OSU College of Forestry. "We used to believe that when new precipitation entered the soil, it mixed well with other water and eventually moved to streams. We just found out that isn't true."
"This could have enormous implications for our understanding of watershed function," he said. "It challenges about 100 years of conventional thinking."
What actually happens, the study showed, is that the small pores around plant roots fill with water that gets held there until it's eventually used up in plant transpiration back to the atmosphere. Then new water becomes available with the return of fall rains, replenishes these small localized reservoirs near the plants and repeats the process. But all the other water moving through larger pores is essentially separate and almost never intermingles with that used by plants during the dry summer.
The study found in one test, for instance, that after the first large rainstorm in October, only 4 percent of the precipitation entering the soil ended up in the stream -- 96 percent was taken up and held tightly by soil around plants to recharge soil moisture. A month later when soil moisture was fully recharged, 55 percent of precipitation went directly into streams. And as winter rains continue to pour moisture into the ground, almost all of the water that originally recharged the soil around plants remains held tightly in the soil -- it never moves or mixes.
"This tells us that we have a less complete understanding of how water moves through soils, and is affected by them, than we thought we did," said Renee Brooks, a research plant physiologist with the EPA and courtesy faculty in the OSU Department of Forest Ecosystems and Society.
"Our mathematical models of ecosystem function are based on certain assumptions about biological processes," Brooks said. "This changes some of those assumptions. Among the implications is that we may have to reconsider how other things move through soils that we are interested in, such as nutrients or pollutants."
The new findings were made possible by advances in the speed and efficiency of stable isotope analyses of water, which allowed scientists to essentially "fingerprint" water and tell where it came from and where it moved to. Never before was it possible to make so many isotopic measurements and get a better view of water origin and movement, the researchers said.
The study also points out the incredible ability of plants to take up water that is so tightly bound to the soil, with forces nothing else in nature can match.
The research was conducted in the H.J. Andrews Experimental Forest near Blue River, Ore., a part of the nation's Long Term Ecological Research, or LTER Program. It was supported by the EPA.
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