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
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The Many Avenues of Ruby Help in the ICM Online Help File—Hint for AI Usage
1/ Ruby Introduction In the ICM Online Help File You can print any of these pages and use them with most of the AIs. Or copy and paste the
The original SWMM Manual from 1971—it came in four volumes, including the source code. They all date from 1971 and describe the earliest published volumes of the Storm Water Management Model (SWMM), developed through a partnership of Metcalf & Eddy, Inc., … Read the rest
SWMM History
SWMM 4
SWMM 3
SWMM3
SWMM2
SWMM1
swmm-1-volume-iv-program-listing.pdf
InfoSewer
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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
As SWMM5 is a link node network, the area of a Storage Node is both the area of the Wet Well and typically ½ the surface area of the connecting links. There is no surface area for the Pump(s) downstream of the Wet Well (Storage) but the area of … 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The SWMM3 Orifice Test File: A Historical Reference for Modern Hydraulic Modeling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
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
To compare and contrast the Horton and Green-Ampt models for estimating soil infiltration, we need to understand the key aspects of each model, focusing on their application in sandy loam soil. Both models are used in hydrology to estimate the rate at … Read the rest
1. Three runoff surfaces
a. Impervious with Depression Storage
b. Pervious
c. Impervious without Depression Storage
