1/ There is also an ArcEngine version of InfoSWMM call InfoSWMM SA. I will SA to show some hidden features of the 1D St Venant solution for SWMM5, InfoSWMM, and ICM SWMM Networks by showing the output graphs and reports of SA
2/ ArcEngine InfoSWMM SA 3.0 uses the 10.7 … 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… 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
Privileged and Confidential Communication: This electronic mail communication and any documents included hereto may contain confidential and privileged material for the sole use of the intended recipient(s) named above. If you are not the intended recipient (or authorized to receive for the recipient) of this message, any review, use, distribution … Read the rest
What if the percent routing is 100 percent?
1.3 SWMM’s Process Models and Modeling Objects, Units
| Table 1-2 | SWMM’s modeling objects | ||||||
| Category | Object Type | Description | |||||
| Hydrology | Rain Gage | Source of precipitation data to one or more | |||||
| subcatchments. | |||||||
| Subcatchment | A land parcel that receives precipitation associated | ||||||
| with a rain gage and generates runoff that flows into | |||||||
| a drainage system | |||||||
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 fashion, … 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 |
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 … 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.
| · | Types of objects |
| · | Adding objects |
| · | Selecting an object |
| · | Moving an object |
| Flow Routing |
Flow 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 used to solve these equations:… 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
| Nodes |
Nodes are points of a conveyance system that connect conveyance links together. There are several different categories of nodes that can be employed:
| · | Junctions |
| · | Outfalls |
| · | Flow Dividers |
| · | Storage Units |
Nodes are also the points where external inflows can enter a drainage system … Read the rest
| Water Quality Modeling Features |
In addition to modeling the generation and transport of runoff flows, SWMM can also estimate the production of pollutant loads associated with this runoff. The following processes can be modeled for any number of user-defined water quality constituents:
| · | dry-weather pollutant buildup |