Helping across the full stormwater spectrum: SWMM (50+ yrs), InfoSWMM/ESRI (20 yrs), InfoWorks ICM (15 yrs), & Autodesk AEC Collection (5 yrs) Grandpa (10 yrs)
December 14, 2025
There is quite … Read the rest
](https://www.linkedin.com/in/robertdickinson/)
Helping across the full stormwater spectrum: SWMM (50+ yrs), InfoSWMM/ESRI (20 yrs), InfoWorks ICM (15 yrs), & Autodesk AEC Collection (5 yrs) Grandpa (10 yrs)
November 30, … Read the rest
](https://www.linkedin.com/in/robertdickinson/)
Helping across the full stormwater spectrum: SWMM (50+ yrs), InfoSWMM/ESRI (20 yrs), InfoWorks ICM (15 yrs), & Autodesk AEC Collection (5 yrs) Grandpa (10 yrs)
May 13, 2025
Introduction
Bridging Decades with AI … Read the rest
* <<<<<<<<< SWMM 4.45A(beta) RUNOFF DATA FILE >>>>>>>>>
*
*
* This is an input data file to the SWMM 4.4 Runoff Block for
* modeling watershed quantity and quality. All lines with an
* asterisk in column 1 are comment lines and are ignored
* by the program.
*
* <<<<<<<< SWMM 4.99 EXTRAN DATA FILE >>>>>>>>>
*
*
* July 2004
*
* This is an input data file to the SWMM 4.4G (CDM) Extran Block
* for modeling the hydraulics of sewer or open channel systems.
* All lines with an asterisk in column 1 are … Read the rest
If you’re serious about modeling, you’ll need to understand how the engine solves differential equations sooner or later. So the next time the engine does something strange, you’ll know what to look for.
Most people, I believe, are like me in that they cannot derive their intuition from equations; it … Read the rest
The SWMM3 Weir Test File: A Historical Reference for Modern Hydraulic Modeling
This test file holds special historical significance in the development of stormwater modeling. Originally published in the 1981 EXTRAN 3 manual by CDM (now CDM Smith), it was specifically designed to validate orifice calculations in hydraulic networks. The … Read the rest
The SWMM3 or Extran3 Side Outlet Orifice Test File: A Historical Reference for Modern Hydraulic Modeling
This is a story about one inp file. It shows the continuity in stormwater modeling from 1980 to 2025 onwards. It is about Example 5 from the 1981 Extran Manual. This compact test case, … Read the rest
The SWMM3 or Extran3 Type 1 Pump Test File: A Historical Reference for Modern Hydraulic Modeling
This is a story about one inp file. It shows the continuity in stormwater modeling from 1980 to 2025 onwards. It is about Example 6 from the 1981 Extran Manual. This compact test case, … Read the rest
The SWMM3 or Extran3 Type 2 Pump Test File: A Historical Reference for Modern Hydraulic Modeling
This is a story about one inp file. It shows the continuity in stormwater modeling from 1980 to 2025 onwards. It is about Example 7 from the 1981 Extran Manual. This compact test case, … Read the rest
Autodesk Water Technologist for Storm Sewer and Flood | Expert in ICM InfoWorks ICM SWMM/Ruby | 18 Years at Innovyze/Autodesk | 52 Years with EPASWMM TAC for CIMM.ORG … Read the rest
This is a story about two inp files. It shows the continuity in stormwater modeling from 1980 to 2025 onwards. It is about Extran1 (free outfall) and Extran 2 (fixed backwater with a tide gate) from the 1981 Extran Manual. This compact test case, born in the era of punch … Read the rest
Introduction
This is about a GitHub repository that that preserves the SWMM 4 Fortran engine and associated files from Wayne C. Huber's version at Oregon State University, known as SWMM 44h. SWMM (Storm Water Management Model) is and was a software tool used for simulating stormwater runoff quantity and quality … Read the rest
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STORM WATER MANAGEMENT MODEL
QUALITY ASSURANCE REPORT:
Dynamic Wave Flow Routing
By
Lewis A. Rossman
Water Supply and Water Resources Division
National Risk Management Research Laboratory
Cincinnati, OH 45268
NATIONAL RISK MANAGEMENT RESEARCH LABORATORY
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
CINCINNATI, OH 45268
DISCLAIMER… Read the rest
The SWMM3 Orifice Test File: A Historical Reference for Modern Hydraulic Modeling
This test file holds special historical significance in the development of stormwater modeling. Originally published in the 1981 EXTRAN 3 manual by CDM (now CDM Smith), it was specifically designed to validate orifice calculations in hydraulic networks. The … Read the rest
Diamond Village is one of the University of Florida’s long-standing graduate and family housing communities, known for its close-knit atmosphere and the unique civic structure that encourages resident leadership. Over the decades, Diamond Village has … Read the rest
While recently organizing my garage, I discovered an intriguing poster I'd created comparing the 1D St Venant Terms between SWMM4 and SWMM5. Originally crafted in Microsoft Publisher for the 2007 Urban Runoff Modeling Conference at Humboldt State University, this poster presented a compelling analysis of hydraulic solutions. Though the original … Read the rest