Junction Dry Weather Flow (DWF)
The Junction Dry Weather Flow (DWF) data table stores information regarding the dry weather load (e.g., sanitary loads) entering the collection system at the junction node. Refer to the section on the inflow editor for more information on these input data. The following table shows … Read the rest
This project modified in this tutorial illustrates how Designer calculates sewer conduit size, storage volume, and pump size to meet specified design criteria at the minimum cost.
The model schematic is shown on the next page. The model contains two wastewater treatment plants (outfall110 and outfall94), … Read the rest
Question: How does SWMM5 solve the 1D St Venant Equation in its conceptual Link/Node Network?
Answer: See these graphs of the solved for variables in the solution.
1/ There is also an ArcEngine version of InfoSWMM call InfoSWMM SA. I will SA to show some hidden features of the 1D … Read the rest
Subject: How to Make an Internal Outfall into an External Outfall when you have more than one link connected to an Outfall
Step 1: Identify the Problem "ERROR 141: Outfall J-561 has more than 1 inlet link or an outlet link." Means you have an outfall node in the… Read the rest
Note: The variable time step option is a powerful feature of SWMM5 as it lets the engine determine the CFL time step needed for each time step (1). A good guide is to use a maximum time step 2 to 5 times bigger than the average time step during a … Read the rest
2006 PDF from Huber et al BMP Modeling Concepts and Simulation
2006 PDF from Huber et al BMP Modeling Concepts and Simulation… Read the rest
What if the percent routing is 100 percent?
EPA SWMM Reference Manual Section 1.3 SWMM’s Process Models and Modeling Objects, Units
… Read the restA blog created from the SWMM5 Reference Manual which makes it searchable. Original on the EPA Web Site https://lnkd.in/eKGHAB7 #watermatters
From Ben’s twitter account
If you’re into the Saint-Venant equations, there’s a new derivation in town.
https://doi.org/10.5194/hess-23-1281-2019 …
Conservative finite-volume forms of the Saint-Venant equations for hydrology and urban drainage
Ben R. Hodges
National Center for Infrastructure Modeling and Management, University of Texas at Austin, Austin, Texas, USA
Received: 02 … Read the rest
The SWMM5 engine uses mean flow as the dry weather flow value (DWF) and not population but does allow weekday, weekend, daily and monthly patterns. You can use these many pattern options to actually use population in the SWMM5 and InfoSWMM dry weather flow tables. Here are the steps as … Read the rest
Excerpt from the EPA manual Storm Water Management Model Reference Manual Volume III – Water Quality (PDF) which can be found here
Management of stormwater quality is usually performed through a combination of so-called “best management practices” (BMPs) and a form … Read the rest
Surface Ponding
Normally in flow routing, when the flow into a junction exceeds the capacity of the system to transport it further downstream, the excess volume overflows the system and is lost. An option exists to have instead the excess volume be stored atop the junction, in a ponded … Read the rest
| SWMM’s Main Window |
SWMM’s main window is pictured below. Click on a labeled element to learn more about it.
| Map Toolbar |
The Map Toolbar contains buttons for viewing the Study Area Map.
| Selects an object on the Map | |
| Selects link or subcatchment vertex points |
Unit Hydrographs (UHs) estimate rainfall-dependent inflow/infiltration (RDII) into a sewer system. A UH set contains up to three such hydrographs, one for a short-term response, one for an intermediate-term response, and one for a long-term response. A UH group can have up to 12 UH sets, … Read the rest
| Introducing EPA SWMM5 |
The EPA Storm Water Management Model (SWMM) is a dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component of SWMM operates on a collection of subcatchment areas that receive precipitation and generate … Read the rest
| Snowmelt |
Snowmelt parameters are climatic variables that apply across the entire study area when simulating snowfall and snowmelt. They include:
| · | the air temperature at which precipitation falls as snow |
| · | heat exchange properties of the snow surface |
| · | study area elevation, latitude, and longitude correction. |
See … Read the rest
| Using Add-In Tools |
SWMM 5 has the ability to launch external applications from its graphical user interface that can extend its capabilities. This section describes how such tools can be registered and share data with SWMM 5.
| Tools Menu |
The Tools Menu contains commands used to configure … Read the rest
| Working with Objects |
SWMM uses various types of objects to model a drainage area and its conveyance system. This section describes how these objects can be created, selected, edited, deleted, and repositioned.
… Read the restFlow routing within a conduit link in SWMM is governed by the conservation of mass and momentum equations for gradually varied, unsteady flow (i.e., the Saint Venant flow equations). The SWMM user has a choice on the level of sophistication … Read the rest
| Climatology |
The Climatology object in EPA SWMM describes the following climate-related variables used for computing runoff and snowmelt:
| · | Temperature |
| · | Evaporation |
| · | Wind Speed |
| · | Snowmelt |
| · | Areal Depletion |
| · | Climate Adjustments |
| Rain Gages |
Rain Gages supply precipitation data for one or more subcatchment areas … Read the rest
| Aquifers |
Aquifers are sub-surface groundwater zones used to model the vertical movement of water infiltrating from the subcatchments that lie above them. They also permit the infiltration of groundwater into the drainage system, or exfiltration of surface water from the drainage system, depending on the hydraulic gradient … Read the rest
| Non-visual Objects |
In addition to physical objects that can be displayed visually on a map, SWMM utilizes several classes of non-visual data objects to describe additional characteristics and processes within a study area.
| · | Climatology Data |
| · | Hydrology Data |
| · | Hydraulic Data |
| · | Water Quality Data |
| Links |
Links are the conveyance components of a drainage system and always lie between a pair of nodes. Types of links include:
| · | Conduits |
| · | Pumps |
| · | Regulators |
| Conduits |
Conduits are pipes or channels that move water from one node to another in the conveyance system. Their … Read the rest
