Saturday, August 26, 2017

Steps for Running RDII Analyst in H2OMap SWMM

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 Node for the Analysis
Step 4.  Select a Node
Step 5.  Define the Flow Data
Step 6.  Define the Rainfall Data
Step 7.  Calculate the DWF and GW flow
Step 8.  Calculate the Wet Weather flow – Flow minus Dry Weather Flow
Step 9.  Set up the RDII GA Run
Step 10.  The RDII Calibration Result
Step 11.  Export RTK parameters back to H2Omap SWMM

Sunday, August 20, 2017

Runoff Surface Suggestions for Future #SWMM5 's and #SWMM6 - with added Emojis

Expanding Runoff Surface Types for Upcoming SWMM Versions 💧🌍🌆🌦

The Storm Water Management Model (SWMM) has been an instrumental tool in simulating urban hydrological processes. Over the years, SWMM has evolved, adding new features and capabilities 🚀. One area ripe for expansion is the classification of runoff surfaces 🌿🌃.

Current Runoff Surfaces in SWMM:

  • Impervious with Depression Storage 🏢: Accounts for evaporation ☁ but not infiltration 🕳.
  • Pervious 🌱: Considers depression storage, evaporation, infiltration, and potentially groundwater connection 🌊.
  • Impervious without Depression Storage 🛣: Represents quick runoff from surfaces like roofs and gutters.

Enhancements in SWMM4 and SWMM5 introduced more intricate routing capabilities 🌐 and the integration of Low Impact Development (LID) methodologies 🌳🌼.

Proposed Enhancements for Future SWMM Iterations 🌟:

To reflect the complexity of urban terrains more accurately, there's a proposal to expand the number of runoff surfaces from the current 3 to a more comprehensive 12 📊. Each of these surfaces should have customizable properties, such as:

  1. Flag for depression storage 🚩.
  2. Flag for evaporation 🌬.
  3. Flag for infiltration 🌀.
  4. Flag for groundwater connection 🌍💧.
  5. Flag for RDII (Rainfall-Dependent Infiltration/Inflow) 🌧⚡.
  6. Flag for LID integration 🌸🏞.
  7. Customizable widths and slopes 📏📐.

The existing SWMM framework provides a single slope and width for various runoff surfaces, which doesn't always mirror real-world scenarios. By allowing each surface to have distinct characteristics, it could enhance the model's accuracy and simplify the calibration process 🎯📉.

Technical Implications ⚙🖥:

Implementing these changes would entail:

  • Adapting the SWMM 5 file import process to accommodate the expanded surfaces 📂.
  • Modifying the Enums.h file to account for the new SubAreaType classifications 📑.
  • Adjusting the runoff linkages in various modules, including Subcatch.C, RDII.C, Gwater.C, and LID.C 🔄🔧.
enum SubAreaType { IMPERV0, // impervious surface without depression storage IMPERV1, // impervious surface with depression storage PERV // pervious surface // ... Additional surfaces can be added here };

While these enhancements would certainly increase the model's complexity, the benefits in terms of accuracy and representation of real-world conditions could be invaluable for urban hydrologists and planners 🌆🌍🌧🌳.

Wednesday, August 16, 2017

#SWMM 5 LID 185 message

Here are the soil layer rules for LID’s in SWMM5....  If any of these are wrong you will get an Error 185 message

Soil Porosity > Field Capacity > Wilting Point

    //... check soil layer parameters
    if ( LidProcs[j].soil.thickness >= 0.0; 0.0 )
        if ( LidProcs[j].soil.porosity      <= 0.0 
        ||   LidProcs[j].soil.fieldCap      >= LidProcs[j].soil.porosity
        ||   LidProcs[j].soil.wiltPoint    >= LidProcs[j].soil.fieldCap
        ||   LidProcs[j].soil.kSat            <= 0.0
        ||   LidProcs[j].soil.kSlope       <= 0.0 )

Monday, August 7, 2017

EPA is happy to announce the publication of Volume II of the #SWMM Reference Manual (Hydraulics)

Hello Everyone (from the @CHI SWMM List Server),

EPA is happy to announce the publication of Volume II of the SWMM Reference Manual (Hydraulics).  It can be viewed and downloaded from the EPA SWMM web page:

This completes the full set of reference manuals for SWMM 5 that also includes Volume I (Hydrology) and Volume III (Water Quality and LID).  We hope that these manuals allow SWMM users to gain a better understanding of the computational methods and techniques used by the program.

These volumes were completed by Dr. Lewis A. Rossman, EPA Emeritus.  In his extraordinary career, he has written three remarkable EPA public domain programs:  SWMM, the National Stormwater Calculator ( which is based on SWMM),  and EPANET (   Since 2010, SWMM and EPANET have been downloaded at least 215,000 and 370,000 times and are the basis of many multi-billion, multi-year water infrastructure upgrades.  The codes are easy-to-use, relatively bug-free, and well-documented.  This last volume of the reference manual completes the documentation of SWMM.

Thanks, Lew, and thanks to all of you for your continued interest and support of SWMM.

Michelle Simon. Ph.D., P.E.
EPA Office of Research and Development
Water Systems Division
Associate Director of Science
Cincinnati, OH 45268

Emoji EPANET2.2 Reference Table

  Author(s) Year Title Emoji Bhave 1991 Analysis of Flow in Water Distribution Networks 📘 Clark, R.M. 1998 Chlorine demand and Trihalometha...