How to Easily Use the DWF Allocator with your Lots Shapefile in InfoSWMM

How to Easily Use the DWF Allocator with your Lots Shapefile in InfoSWMM

The goal of this document is to show how you can use a shapefile with polygon loadings to a link in the InfoSWMM DWF Allocator to create DWF loadings to the nodes in InfoSWMM that are the … Read the rest

How to Use Population for DWF in SWMM5 and InfoSWMM

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

Treatment in BMP’s and LID’s for SWMM5

Treatment in BMP's and LID's

5.1 Treatment

Excerpt from the EPA manual Storm Water Management Model Reference Manual Volume III – Water Quality (PDF) which can be found here

5.1.1 Background

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 in SWMM5

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 … Read the rest

Surface Runoff in InfoSWMM and InfoSWMM SA

Surface Runoff in InfoSWMM

InfoSWMM offers 12 choices for modeling surface runoff (click on link to see more information on each method):

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Refactoring the SWMM 5 Help File – Study Area Map in SWMM5

Study Area Map in SWMM5

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
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SWMM4 Fortran Changes post September 28, 1999

This file documents changes made to swmm44gu by Wayne Huber or others


WCH = Wayne Huber

RED = Robert Dickinson

CIM = Chuck Moore

MCH = Mitch Heineman

LR = Lew Rossman

  1. 10/11/99, C. Moore. Yroute: Correct C. Moore correction at line 118

to make akon = -1.0000001

The … Read the rest

Refactoring the SWMM 5 Help File – RDII in SWMM5


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 sets, Read the rest

Refactoring the SWMM 5 Help File – SWMM5 Introduction

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

Refactoring the SWMM 5 Help File – Snowmelt in SWMM5

Snowmelt in SWMM5


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

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