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
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
Subject: InfoSWMM (d/D v. Surcharge d/D)
What is the difference between the output variables d/D and Surcharge d/D in InfoSWMM and H2OMap SWMM
The d/D is calculated as link capacity based on the midpoint depth of water … Read the rest
Subject: How to Use Trace Upstream, Domain Manager and Facility Manager in InfoSewer to Find the CE
InfoSewer does not have table of node continuity errors only an overall continuity error balance. If you have a continuity error then you can use the process of divide and conquer to … Read the rest
Note: Water Age in InfoSewer
InfoSewer and H2OMAP Sewer have a Water Quality option called Time of Concentration (TOC) or Water Age that allows the modeler to estimate the residence time in his or her Sewer Network. The use of Water Age is simple, you just pick TOC(AGE) … Read the rest
Subject: Mass Balance for Water Quality in SWMM 5
The rainfall concentration is listed in the wet deposition row of the Runoff Quality Continuity Table, the washoff such as EMC washoff is listed in the Surface Runoff row. If you are simulating groundwater quality then it is listed as a … Read the rest
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
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 … Read the rest
Subject: What are the Equations for Weirs in SWMM 5, Part 2?
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 … Read the rest
Subject: Water Quality Treatment Removal Variables in SWMM5
The treatment variables for Water Quality in a SWMM 5 storage unit (Figure 1) can be either:
1. A Process Variable
a. HRT or Hydraulic Residence Time
b. DT or Time Step
c. FLOW or The Current Inflow
d. DEPTH or the … Read the rest
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 … Read the rest
Dry Weather Flow in InfoSWMM and H2OMap SWMM
Dry weather flow can be added to any node in H2OMAP SWMM. The dry weather flow is computed as the average flow * the monthly pattern * the daily pattern * hourly pattern * the weekend daily pattern to give the … Read the rest
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
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 … Read the rest
Subject: Example FM SWMM 5 model with and without Surcharge Depth
You need to use the surcharge depth for a Force Main in SWMM 5 to allow the engine to find the right point on the pump curve and pump up the rising main. If you do not use a
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
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.
Subject: SWMM 5 Leaping Weir Example
The attached example shows one way how SWMM 5 RTC Rules can be used to have the low flow go down a leaping weir orifice and the high flow go over the weir to the downstream section of the sewer.
via Blogger http://www.swmm5.net/2013/08/swmm-5-leaping-weir-example.html… Read the rest