Steps in Using RDII Analyst for InfoSWMM, ICM and InfoSewer

Subject:  Steps in Using RDII Analyst for InfoSWMM, ICM and InfoSewer

Steps in Using RDII Analyst for InfoSWMM, ICM and InfoSewer by dickinsonre Subject:  Steps in Using RDII Analyst for InfoSWMM, ICM and InfoSewer  Step 1: Create a Base UH  in the Operation Tab of the Attribute Browser using RDII Analyst (Figure 1) Step 2: Assign a UH to at Least 1 Node Using the Inflow Icon   Step 3: Open Up RDII Analyst and Click on New to Create a RDII Session     Step 4: Define the Flow and Rainfall File      Step 5: Review the Imported Flow Time Series Step 6: Review the Imported Rainfall  Time Series           Step 7: Units and RDII Analyst Dates are Controlled by the Simulation Manager    Step 8: Extract DWF from the Flow Time Series     Step 9: Assign a UH to at Least 1 Node Using the Inflow Icon   Step 10: View the DWF Pattern          Step 11: Create the RDII Time Series           Step 12: View the RDII Time Series    Step 13: Run Once Feature to See how Good the Current RTK Parameters are in matching the monitored flow Step 14: You can use Graph Control to show the mean of the Observed and Predicted RDII on one Graph.         Step 15: Calibrate the RTK Parameters         Step 16: Run the GA  Step 17: Assign the Intermediate Answers  to the UH      Step 18: View the Calibration Graph   Step 19: Event Identification    Step 20: Assign the Found DWF Pattern      Step 21: Node DWF and RDII Inflow Step 22: 3 RDII UH's Used in the Simulation of the RDII Flows    Figure 1.  RDII Analyst is part of the InfoSWMM or H2OMAP SWMM Suite but the derived RTK parameters can be used in either InfoSWMM, SWMM5, ICM or InfoSewer  via Blogger http://www.swmm5.net/2013/08/steps-in-using-rdii-analyst-for.html

How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt?

Subject:  How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt?

How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt? by dickinsonre Subject:  How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt? You can use the monthly soil recovery factor (Figure 1) in SWMM 5 to change how the Infiltration Maximum Time to Drain the Upper Soil Zone (Figure 2) is computed each month during a continuous simulation.  The  depth of the upper soil zone in the internal  SWMM 5 units of feet is calculated at the start of the simulation based on the Green Ampt Soil Saturated Hydraulic Conductivity Upper Soil Zone Depth = 4  * (Soil Saturated Hydraulic Conductivity * 12 * 3600)^0.5 / 12 And the Upper Zone Moisture Depletion Factor  and Infiltration Maximum Time to Drain the Upper Soil Zone is calculated at each hydrology time step in SWMM 5. Upper Zone Moisture Depletion Factor  = Upper Soil Zone Depth / 300 * 12 /3600 * Monthly Evaporation Recovery Factor Infiltration Maximum Time to Drain the Upper Soil Zone = 6 / (100 * Upper Zone Moisture Depletion Factor  ) Figure 1.  Monthly Soil Recovery Factor Figure 2.  Infiltration Maximum Time to Drain the Upper Soil Zone for a Subcatchment via Blogger http://www.swmm5.net/2013/08/how-does-infiltration-maximum-time-to.html

What are the Equations for Weirs in SWMM 5?

Subject:   What are the Equations for Weirs in SWMM 5?

There are four types of Weirs in SWMM 5:  Transverse, Sideflow, V Notch and Trapezoidal.   The trapezoidal weir is a combination of the Sideflow and V Notch Weir and the Sideflow acts like a Transverse Weir when the flow is reversed (Figure 1).

Figure 1.   Weir Equations in SWMM 5

Weir Equations in SWMM 5

Convolution of the RDII UH from R, T and K in SWMM 5

Subject:  Convolution of the RDII UH from R, T and K in SWMM 5

Convolution of the RDII UH from R, T and K in SWMM 5 by dickinsonre Subject:  Convolution of the RDII UH from R, T and K in SWMM 5 The convolution uses the value of R and the Time Base to estimate the amount of Infiltration and Inflow in the Sewer Network.  The short, medium and long term UH's are estimated at each Wet Hydrology time step to make a smooth hydrograph out of the R, T and  K parameters of the Rainfall Dependent Infiltration and Infiltration Method (Figure 1).  The three UH's can be displaced as well if you use the RTK storage parameters (Figure 2) Figure 1.  The short, medium and long UH's are convoluted in SWMM 5 from the Rainfall Time Series. Figure 2.   The Initial Abstraction Depth can be used to shift the generated UH in time or reduce the peak flow and total volumes. c. via Blogger http://www.swmm5.net/2013/08/convolution-of-rdii-uh-from-r-t-and-k.html

Mass and Concentration Water Quality Loadings in SWMM 5

Subject:   Mass and Concentration Water Quality Loadings in SWMM 5

If you have a time series of flow and water quality at a node in SWMM 5 you have the option of using either a Mass loading or a concentration loading (Figure 1).     If you have a concentration then the load to the node internally in SWMM 5 is the flow times the concentration.  Alternatively, if you have Mass loading then the program will calculate the concentration from the flow and the load.  The table below shows some combinations of flow in cfs and load in pounds per day to yield various BOD 5 concentrations it the network nodes and  links (Figure 2).  For example, at a flow of 10 cfs you can get a BOD5 concentration of 100 mg/l with a loading of about 5400 pounds of BOD5 per day (Figure 3).

Figure 1.  If you use a time series load in SWMM 5 you need TWO time series, one for the flow and one for the mass load or concentration.

Figure 2.   The Mass loading needed to generate a concentration at a particular flow rate.

Flow (CFS)	BOD5 (mg/l)	BOD 5 Pounds Per Day
1	1	5.39
1	10	53.89
1	50	269.45
1	100	538.89
1	200	1077.79
10	1	53.89
10	10	538.89
10	50	2694.47
10	100	5388.93
10	200	10777.87
100	1	538.89
100	10	5388.93
100	50	26944.66
100	100	53889.33
100	200	107778.66

Figure 3.  The calculated BOD 5 concentration in the link from the Mass Loading.

BOD5.inp Download this file

Modeling H2S in InfoSWMM

Subject:   Modeling H2S in InfoSWMM

Modeling H2S in InfoSWMM, ICM and InfoSewer by dickinsonre Subject:   Modeling H2S in InfoSWMM, ICM and InfoSewer You can model Sulfide in InfoSWMM/ICM and InfoSewer using the H2S water quality modeling option which uses BOD5 loading at nodes to estimate the  S concentration in the nodes and links of the network using constant network parameters for:  1.       The Reaction Rate Coefficient, 2.       The Sulfide Loss Coefficient, 3.       Sulfide Flux Coefficient, 4.       Temperature in Degrees C, 5.       Soluble Sulfide Percentage, 6.       pH for the whole network, and 7.       The Ionization Constant. Relationship between BOD5 and EBOD Figue 1.  The concentation  of H2S and BOD5 can be graphed at each node and link. Figure 2.   Dialogs for H2S and BOD5 in InfoSWMM via Blogger http://www.swmm5.net/2013/08/modeling-h2s-in-infoswmm-icm-and.html

Saving to previous versions of ArcGIS in InfoSWMM and InfoSewer

Saving to previous versions of ArcGIS in InfoSWMM and InfoSewer

Once you open and save an existing map document (.mxd file) using ArcGIS 10, the map can no longer be opened with earlier versions of ArcGIS because it will now reflect the new functionality added at 10. Similarly, new documents you create with 10 also cannot be opened in earlier versions of the software. However, you can use the Save A Copy command to make a copy of a map document so you can open and work with it in previous versions of ArcGIS. With ArcGIS 10, you can save to ArcGIS 9.3, 9.2, 9.0/9.1, or 8.3. ArcGIS 9.0 and 9.1 map documents are directly compatible with each other and those versions of the software.

Each new version of ArcGIS introduces functionality and properties that aren't available in previous versions. When you save a map document, layer file, or 3D document to a previous version of ArcGIS, the format of the file is changed to eliminate properties not available in the older version.

This means saving from 10 to a previous version removes from the file any functionality that depends on the newer software in ArcGIS 10. Therefore, some work may be lost if you save to 9.3, 9.2, 9.0/9.1, or 8.3 and start working with the older copy again in 10, since the 10 functionality was stripped out in the Save A Copy process. Your original ArcGIS 10 file will still have the new functionality.  Source http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//006600000253000000.htm

Historical SWMM 5 and SWMM 4 Engines and Examples

Subject:  Historical SWMM 5 and SWMM 4 Engines and Examples

The web site has http://swmm5legacycode.ning.com/  historical SWMM 5 installs, SWMM 5 input file examples and SWMM 4 input files and engines.   The SWMM 4 engines go back to SWMM 3.5 engines from the 1980’s.

Link Iterations in the SWMM 5 Dynamic Wave Solution

Subject:   Link Iterations in the SWMM 5 Dynamic Wave Solution

Link Iterations in the SWMM 5 Dynamic Wave Solution by dickinsonre 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 governing the number of iterations are: 1.       A minimum of 2 iterations per time step with the 1st iteration NOT using the underrelaxtion parameter of 0.5 (Figure 1) 2.       If both the downstream and upstream nodes are converged then the link drops out of the iteration process during the time step (Figure 2) 3.       The number of iterations for each link can vary over the simulation from 2 to 8 depending on how fast the flow is changing. Figure 1.  A minimum of two and up to eight iterations per time step in the SWMM 5 dynamic wave solution. Figure 2.  The number of iterations for each link vary through out  the simulation with less iterations being used for constant flows. via Blogger http://www.swmm5.net/2013/08/link-iterations-in-swmm-5-dynamic-wave.html

How 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?

How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5? by dickinsonre 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) / Link Length or dq2 = Time Step * Awtd * (HGL) / Link Length Qnew = (Qold – dq2 + dq3 + dq4) / ( 1 + dq1) when the force main is full dq3 and dq4 are zero and Qnew = (Qold – dq2) / ( 1 + dq1) The dq4 term in dynamic.c uses the area upstream (a1) and area downstream (a2), the midpoint velocity, the sigma factor (a function of the link Froude number), the link length and the time step or dq4 = Time Step * Velocity * Velocity * (a2 – a1) / Link Length * Sigma the dq3 term in dynamic.c uses the current midpoint area (a function of the midpoint depth), the sigma factor and the midpoint velocity dq3 = 2 * Velocity * ( Amid(current iteration) – Amid (last time step) * Sigma dq1 = Time Step * RoughFactor / Rwtd^1.333 * |Velocity| The weighted area (Awtd) is used in the dq2 term of the St. Venant equation: dq2 = Time Step * Awtd * (Head Downstream – Head Upstream) / Link Length The four terms change at each iteration and time step to determine the new flow (Figure 1) based on the two equations: Denom = 1 + dq1 + dq5 Q = [Qold – dq2 + dq3 + dq4] / Denom If you look at a table of the values you will see that the terms add up to zero when the flow is constant and to delta Q or the change in Q when the flow is NOT constant (Figure 2). Figure 1.  The four terms define the new flow at each iteration in the dynamic wave solution of SWMM5 Figure 2.   The magnitude of the four terms determine the flow at the new iteration and ultimately the new Time Step.  If the flow is constant then the value of the term is constant. via Blogger http://www.swmm5.net/2013/08/how-is-st-venant-equation-solved-for-in.htm

SWMM 5 Precipitation Options

Subject:  SWMM 5 Precipitation Options

SWMM 5 Precipitation Options by dickinsonre 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 . via Blogger http://www.swmm5.net/2013/08/swmm-5-precipitation-options.html

Saving an Output Relate in InfoSWMM directly to Excel using Arc Tool Box

Subject:  Saving an Output Relate in InfoSWMM directly to Excel using Arc Tool Box

Saving an Output Relate in InfoSWMM directly to Excel using Arc Tool Box by dickinsonre Subject:  Saving an Output Relate in InfoSWMM directly to Excel using Arc Tool Box The following shows how to make an Excel file directly from a feature table in InfoSWMM Step 1.  Download the Arc Tool box add on Table to Excel You can download the python script from here   http://resources.arcgis.com/gallery/file/geoprocessing/details?entryID=95009B25-1422-2418-7FB5-B8638ECB2FA9 Step 2.    Add the Tool to Arc Toolbox and then use the tool to create an Excel CSV File Step 3.  You can export any of the features in InfoSWMM to CSV    via Blogger http://www.swmm5.net/2013/08/saving-output-relate-in-infoswmm.html

Example DUPUIT-FORCHHEIMER APPROXIMATION FOR SUBSURFACE FLOW Model in SWMM 5

Subject:   Example  DUPUIT-FORCHHEIMER APPROXIMATION FOR SUBSURFACE FLOW Model in SWMM 5

Example DUPUIT-FORCHHEIMER APPROXIMATION FOR SUBSURFACE FLOW Model in SWMM 5 by dickinsonre Subject:   Example  DUPUIT-FORCHHEIMER APPROXIMATION FOR SUBSURFACE FLOW Model in SWMM 5  This example was created from an older SWMM 4 model from 1988 using the SWMM 4 to SWMM 5 converter.  The values for the coefficients in this case are A1 = A3 = 4*K/L^2, A2 = 0, B1 or the exponent or B1=2 or from Appendix X in the SWMM 4 manual from OSU (http://eng.odu.edu/cee/resources/model/mbin/swmm/swmm_6.pdf)   via Blogger http://www.swmm5.net/2013/08/example-dupuit-forchheimer.html

Example Groundwater Model in SWMM 5

Subject:   Example Groundwater Model in SWMM 5

Example Groundwater Model in SWMM 5 by dickinsonre Subject:   Example Groundwater Model in SWMM 5  The attached model shows three ways in which the groundwater model of the SWMM 5 subcatchments interact with the node depths of the hydraulic network.  The hydraulic network interaction can be either:  1.       At a fixed water surface elevation, 2.       At a time varying water surface elevation based on the inflow and geometry of the node and 3.       At a threshold node water surface elevation.  via Blogger http://www.swmm5.net/2013/08/example-groundwater-model-in-swmm-5.html

Example SWMM 5 Snowmelt Model

Subject: Example SWMM 5 Snowmelt Model

Example SWMM 5 Snowmelt Model by dickinsonre Subject: Example SWMM 5 Snowmelt Model  Attached is a simple sample snowmelt model in SWMM 5 that has built in snowfall and temperature in a one subcatcment model with snowmelt.   You define the separation of precipitation into snowfall and rainfall by setting a base temperature in the Snow Pack Editor.   The precipitation that falls with when the air temperature is below the base temperature is stored in a snow pack where it eventually will melt when the temperature rises or is moved via plowing.  You can have an initial snow cover, final snow cover and runoff from the melting snow long after the snowfall occurs. via Blogger http://www.swmm5.net/2013/08/example-swmm-5-snowmelt-model.html

Runoff Routing Options Example in SWMM 5

Subject:   Runoff Routing Options Example in SWMM 5

Runoff Routing Options Example in SWMM 5 by dickinsonre Subject:   Runoff Routing Options Example in SWMM 5 There are six options for runoff routing in SWMM 5:  ·         All Runoff to an Outlet Node ·         All Runoff to another Subcatchment ·         All Runoff to the Pervious Area of the Subcatchment or other Subcatchment ·         All Runoff to the Impervious Area of the Subcatchment or other Subcatchment ·         Partial Runoff to the Pervious Area of the Subcatchment or other Subcatchment ·         Partial Runoff to the Impervious Area of the Subcatchment or other Subcatchment  The attached example SWMM 5.0.022 file has three catchments in a chain, the 1stSubcatchment Routes to the Pervious area of the 2nd Subcatchment and the 2ndSubcatchment routes the runoff to the Impervious area of the 3rd Subcatchment which routes all runoff to an outlet node.  via Blogger http://www.swmm5.net/2013/08/runoff-routing-options-example-in-swmm-5.html