Runoff Coefficients
Runoff coefficient is loosely defined as the ratio of runoff to rainfall, and is a function of watershed characteristics including land use, soil type, and slope of the watershed. The value of runoff coefficient ranges between 0.0 and 1.0. A value of 0.0 means that all of the … Read the rest
2.5 Decomposing the Corrected Flow Data
The corrected flow data can be decomposed into its DWF, GWI, and RDII flow components with the help of the rainfall data. The decomposition process is illustrated in this section.
Determining the DWF Component
The first step towards determining the DWF component of the … Read the rest
Example 5. Runoff Water Quality
This example demonstrates how to simulate pollutant buildup and washoff in an urban catchment. The influence of different land uses on pollutant buildup is considered and both Event Mean Concentrations (EMCs) and exponential functions are used to represent the washoff process.
Surface runoff quality is … Read the rest
SWMM 5.1 Error Messages
APPENDIX E – Error and Warning Messages in the Engine of InfoSWMM H2OMap SWMM InfoSWMM SA from #SWMM5
| ERROR 101: | memory allocation error.
There is not enough physical memory in the computer to analyze the study area. |
| ERROR 103: | cannot solve KW equations for Link xxx. |
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
Steps for Running RDII Analyst in H2OMap SWMM
Step 1. Create the RTK UH in the H2OMap SWMM Attribute Browser (AB)
Step 2. Assign the RTK UH to a node (you need one node at least to Run RDII Analyst).
Step 3. Open up RDII Analyst and Set up the … Read the rest
EPASWMM5 Tutorial with Images for SWMM 5.1.014
This is a one HTML file version of the SWMM 5 Tutorial for modeling the quantity and quality of stormwater runoff produced from urban areas. You can find the original in the current EPA SWMM5 Help file. More images have been added. The … Read the rest
Excerpt from the EPA manual Storm Water Management Model Reference Manual Volume III – Water Quality (PDF) which can be found here
The variety of LID controls modeled by SWMM introduces a significant number of design variables and parameters that must be … Read the rest
References for InfoSWMM and InfoSWMM SA
Using Simulation Task Manager is simple and straightforward.
This example shows how to run a continuous simulation with InfoSWMM H2OMap SWMM InfoSWMM SA using a long-term rainfall record. It will analyze the performance of the drainage system and BMP detention pond for the 29 acre residential site designed in Example 3. The … Read the rest
SWMM 5 Loss Term Values for various velocities and K values
SWMM 5 has three loss terms available for each link: Entrance, Exit and Other losses. The Entrance loss uses the upstream link velocity, the Other loss uses the center link velocity and the Exit loss uses the downstream link … Read the rest
What are the Options for LID Inflow and Outflow in SWMM 5?
The Runoff Surfaces in SWMM 5 are:
1. Pervious area with either Green Ampt, Horton or CN Infiltration
2. Impervious area without Depression Storage or Initial Losses
3. Impervious area with Depression Storage or Initial Losses
Outflow Options … Read the rest
Introduction – the reason for these series of blogs are as an expanded view of the input, engine and output of #SWMM5 It is a companion to the EPA Documentation which I describe here:
… Read the restI have noticed based on email questions and postings to the SWMM List Sever (a great
The reason for this blog: The following is an excerpt from the EPA manual Storm Water Management Model Reference Manual Volume III – Water Quality (PDF) which can be found here
Underdrains are used in the following LID Controls
Underdrains are either recommended or required when the natural … Read the rest
Introduction – the reason for these series of blogs are as an expanded view of the input, engine and output of #SWMM5 It is a companion to the EPA Documentation which I describe here:
I have noticed based on email questions and postings to the SWMM List Sever (a great … Read the rest
A quick note: A really nice feature of the way #SWMM5 models water quality is the easy ability to model tracers for the contribution of the major processes. You can set up a concentration of 100 (for example) for DWF, RDII Flow, Runoff and Groundwater to find the percentage contribution … Read the rest
How to approximate a Steady State Model in SWMM5 and InfoSWMM using the Full Dynamic Wave Solution
The five core components of making this work correctly are:
One of the most powerful InfoSWMM, InfoSWMM SA and H2OMAP SWMM Application Tools from Innovyze is RDII Analyst. RDII Analyst will separate out the Groundwater base flow, Dry Weather Flow (DWF), DWF Patterns, estimate the Wet Weather flow component or RDII Rainfall -Derived Infiltration Inflow (I&I) and use a Genetic … Read the rest
One of the most powerful Innovyze programs is RDII Analyst 2.0 for the Analysis and Calibration of RDII, DWF, DWF Patterns and GWI in Sewer Collection Systems
SWMM, InfoSWMM SA and H2OMAP SWMM Application Tools from Innovyze is RDII Analyst. RDII Analyst will separate out the Groundwater base flow, Dry … Read the rest