Subject: Sensitivity Analysis in InfoSWMM and H2OMAP SWMM
It is easy to perform sensitivity analysis
Figure 1. Physical Data used in the Calculation of Surface Runoff using the Non Linear Reservoir Routing method in SWMM 5.
Figure 2. The base scenario for our sensitivity analysis.
There are seven main steps in the sensitivity analysis of the width:
Step 1. Use the Scenario Explorer to make Child Scenarios from the Base Scenario. For ease of understanding we will name each of the Child Scenario's the percent change in the width parameter. Thus, W-50, will be the Base Width Plus 50 percent.
Step 2. Use the Dataset Manager to create different Subcatchment Sets that will be used for each of the Scenario's. Again for ease of understanding we will use the name S_W+50 etc for the Sets to match the change in the Width Parameter.
Step 3. Use the Scenario Manger to choose the right Subcatchment Set for Each Scenario.
Step 4. Use the Database Editor to Edit and modify the Width of Each Subcatchment Set.
Step 5. Use the Block Edit tool to multiply the Base Width Value by the needed value, 1.25, 1.50, 0.75, 0.50
Step 6. Use the Batch Simulation Command to run all of the Scenario's.
Step 7. Use Report Manager and the tool Compare Graphs to graph the results of Each Scenario together.
Step 8. In Report Manager you can produce a table that shows the runoff for each of the different scenarios.
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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, December 10, 2011
Sensitivity Analysis in InfoSWMM and H2OMAP SWMM
Wednesday, December 7, 2011
How InfoSWMM and H2oMAP SWMM Reads CUHP Hydrographs
Note: The Colorado Urban Hydrograph Procedure (CHUP) 2010 version generates a SWMM 5 Inflows Files containing a time series of flow inflows for 1 to many nodes (Figure 4 and Figure 5). The created Inflows file (Figure 2) can be imported intao InfoSWMM and H2MAP SWMM without any alteration by using the Files command in Run Manager (Figure 1) and graphed using the Output Manager of InfoSWMM and H2OMAP SWMM (Figure 3).
Figure 1. Location of Files Command in Run Manager
The inflows will be read from the Inflows file, which has this format:
Figure 2. Header format of the CUHP Exported Hydrograph
InfoSWMM and H2oMAP SWMM will match the Node Names in the Inflows file to the network node names and import and interpolate the inflows based on the Inflows time step and your hydraulic time step to generate Lateral Inflow Hydrographs
Figure 3. InfoSWMM and H2OMAP SWMM Lateral Inflow Hydrographs
Figure 4. CHUP Inflows File Descrpiption in the CUHP manual.
Figure 5. Cover of CUHP 2005 User Manual from 2010
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Saturday, December 3, 2011
How to Make Contours in InfoSWMM and H2oMAP SWMM
Subject: How to Make Contours in InfoSWMM and H2oMAP SWMM
How to Make Contours in InfoSWMM and H2oMAP SWMMby dickinsonre |
Subject: How to Make Contours in InfoSWMM and H2OMAP SWMM
It is easy to make contours out of node input data or node output data in InfoSWMM and H2oMAP SWMM using the Contour Tool in the Contour Tab of the Attribute Browser. You can control the resolution and the type of smoothing for the created contour (Figure 1). If you haveInfoSWMM Suite you can use the Contour to DEM command in the Subcatchment Manager to convert the created Contour to an Elevation or DEM file (Figure 2 and Figure 3). The Layer properties for the created elevation can be altered in Arc GIS to make a better visual depiction of the elevation (Figure 4).
Figure 1. Contour Tool in the Contour Tab of the Attribute Browser.
Figure 2. Contour to DEM command in the InfoSWMM Subcatchment Manager will convert the created Contour to an Elevation or DEM file.
Figure 3. Convert the Value Field and NOT the level Field of the contour.
Figure 4. The Arc GIS Layer properties can be used to alter the default color ramp and the number of classes used in the color ramp.
Mind The Crap From the Dish
Mind The Crap From the Dish
Sally Aldee fell in the Thames and gashed her leg, a prospect that horrified every medical professional she met. She subsequently traced the river's pollution from Victorian times to today:
The river – which by the way was both the source of the city’s drinking water and the repository for all its poop – became choleric and pestilent. In the summer of 1858, the fumes became so bad they got a name. The "Great Stink" forced members of Parliament to write the legislation that gave the all-clear to Joseph Bazalgette, London’s chief engineer of public works, to build the two massive interceptor sewers that catch London’s sewage and run-off before they’re belched into the Thames. To this day, these brick and mortar Victorian artifacts comprise the backbone of London’s sewer system. ...
Friday, December 2, 2011
Storage Volume vs Depth Equation in SWMM 5
Subject: Storage Volume vs Depth Equation in SWMM 5
A storage node in SWMM 5 can have either a functional form or a tabular depth/area table. The area functional form of a storage node is:
Area = A * Depth^B + C and the Volume has the form in node.c of the SWMM 5 of
Volume = A/(B+1)*Depth^(1+B) + C*Depth
For example if C is 25 square meters, A is 20 and the exponent B is 0.5 we get the following values for area and volume and you can also plot a Scatter Plot of Volume vs Depth in SWMM 5 (Figure 1).
Depth
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Area
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Volume
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Meters
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M^2
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M^3
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0
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25.00
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0.00
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1
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45.00
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38.33
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2
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78.28
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87.71
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3
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109.64
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144.28
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4
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140.00
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206.67
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5
|
169.72
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274.07
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6
|
198.99
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345.96
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7
|
227.92
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421.94
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8
|
256.57
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501.70
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9
|
285.00
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585.00
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10
|
313.25
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671.64
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11
|
341.33
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761.44
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12
|
369.28
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854.26
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Table 1. Area and Volume for a Storage Node in SWMM 5.
Figure 1. You can use a Scatter Graph in SWMM 5 to show the relationship between Volume and Depth. |
Lambda Calculus in the SWMM 5 Dynamic Wave Solution
Subject: Lambda Calculus in the SWMM 5 Dynamic Wave Solution
SWMM 5 uses the method of Successive under-relaxation to solve the Node Continuity Equation and the Link Momentum/Continuity Equation for a time step. The dynamic wave solution in dynwave.c will use up to 8 iterations to reach convergence before moving onto the next time step. The differences between the link flows and node depths are typically small (in a non pumping system) and normally converge within a few iterations unless you are using too large a time step. The number of iterations is a minimum of two with the 1st iteration NOT using the under-relaxation parameter omega. The solution method can be term successive approximation, fixed iteration or Picard Iteration, fixed-point combinatory, iterated function and Lambda Calculus. In computer science, iterated functions occur as a special case of recursive functions, which in turn anchor the study of such broad topics as lambda calculus, or narrower ones, such as the denotational semantics of computer programs (http://en.wikipedia.org/wiki/Iterated_function).
In the SWMM 5 application of this various named iteration process there are three main concepts for starting, iterating and stopping the iteration process during one time step:
· The 1st guess of the new node depth or link flow is the current link flow (Figure 3) and the new estimated node depths and link flows are used at each iteration to estimate the new time step depth or flow. For example, in the node depth (H) equation dH/dt = dQ/A the value of dQ or the change in flow and the value of A or Area is updated at each iteration based on the last iteration’s value of all node depths and link flows.
· A bound or a bracket on each node depth or link flow iteration value is used by averaging the last iteration value with the new iteration value. This places a boundary on how fast a node depth or link flow can change per iteration – it is always ½ of the change during the iteration (Figure 1).
· The Stopping Tolerance (Figure 2) determines how many iterations it takes to reach convergence and move out of the iteration process for this time step to the next time step.
Thursday, December 1, 2011
InfoSWMM Selection Set and Domain Manager
Subject: InfoSWMM Selection Set and Domain Manager
Subject: InfoSWMM and H2Map SWMM Selection Set and Domain Manager
You can use the Domain to easily make selection sets using these two steps. You make a Domain which is the areas of the network you are interested in at the current time and then save your Domain of Interest in a Selection Set.
Step 1: Go to Domain Manager and use Map Selection, Query or the Network to make a domain
Step 2. Go to Selection Sets in the Operation Tab of the Attribute Browser and make a New Set and load the domain into your set.
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Wednesday, November 30, 2011
InfoSWMM and H2OMAP SWMM Import and Export of HEC-RAS Geometry Data
Subject: InfoSWMM and H2OMAP SWMM Import and Export of HEC-RAS Geometry Data
InfoSWMM v11 and H2OMAP SWMM v10 have new import and export features for HEC-RAS interaction. The echange commands are in the exchange menu (Table 1) and you can import HEC-RAS geometry
Table 1. Exchange commands in InfoSWMM and/or H2OMAP SWMM
Figure 1. Import HEC-RAS command imports Geometry Files which will have the extension go1, go2 etc.
Figure 2. The imported Transects can be viewed and edited in the Operations Tab of the InfoSWMM Browser.
Figure 3. The imported Transects can be used as a SWMM 5 Irregular Channel Transect.
Figure 4. Export HEC-RAS command exports a geometry file containing the active Transects in InfoSWMM.
Figure 5. Export HEC-RAS allows you to choose a directory and a name for the exported geometry file.
GEOM Title= MWHS-SWMM Export to HEC-RAS
River Reach= CHO
Type RM Length L Ch R = 1 ,5.065 ,471.716902,515.260000,471.
BEGIN DESCRIPTION:
River Mile 5.065
END DESCRIPTION:
#Sta/Elev= 68
0 214.4 11
174 208.0 275
307 199.9 313
366 208.6 413
441 203.4 447
506 208.1 550
575 205.8 585
644 205.9 651
723 207.8 724
816 209.3 920
1076 209.5 1079
1225 210.6 1358
1443 211.4 1472
1796 212.2 1868
#Mann= 3 , 1 , 0
0 0.1 0
Bank Sta=274.500000,365.500000
Table 2. The exported HEC-RAS Geometry File from InfoSWMM
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