# Category: Inside SWMM5

## Infiltration in InfoSWMM and SWMM5

Infiltration in InfoSWMM and SWMM5 Infiltration is the process of rainfall penetrating the ground surface into the soil over the pervious areas of Subcatchments. InfoSWMM H2OMap SWMM InfoSWMM SA offers three choices […]

## How to Force SWMM5 to use ONLY the Wet Well area for a Pump

Problem: 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. […]

## Peak Discharge: SCS Peak Discharge Method in Innovyze H2OCalc

Peak Discharge: SCS Peak Discharge Method The dialog box for the SCS peak discharge method is shown below. · Input for the SCS peak discharge method: · Unit System – English or […]

## Energy Relation for Closed Conduit Flow in Innovyze H2OCalc

Energy Relation for Closed Conduit Flow Conservation of energy involves a balance in total energy, expressed as head, between any upstream point of flow and a corresponding downstream point, including head losses […]

## Gutter Flow in Innovyze H2OCalc

Gutter Flow Gutters are the sections of roadway that run adjacent to the curb. Their purpose is to collect and convey surface runoff to drainage inlets and in turn to underground storm […]

## Pump Characteristic Curve from Innovyze H2OCalc

Pump Characteristic Curve Pump Characteristic Curve Pump characteristic curves are usually presented graphically describing the relationship between pump head, hp, and the flow rate, Q using either an exponential equation or 3-point […]

## Inertia of Pumps and Motors from Innovyze H2OCalc – Idea for SWMM6

Inertia of Pumps and Motors The combined inertia of pumps and motors driving them, including the connecting shafts and couplings, is required for transient analysis associated with the starting and stopping of […]

## Time of Concentration Methods from Innovyze H2OCalc for any Hydrology Model

Time of Concentration The dialog box for estimating time of concentration using the Kirpich method is shown below. General Input for the time of concentration methods: · Unit System – English or […]

## Gradually Varied Flow in Innovyze H2OCalc

3.4 Gradually Varied Flow Discussions in the previous sections have focused on uniform flow hydraulics where flow depth y and flow velocity V remain constant along the channel. In this section, we […]

## Wave Speed in Innovyze H2OCalc – Alternative? for SWMM6

Note for SWMM6 – this may be useful for any discussion of a Slot in SWMM6.  A Preissmann Slot is used in InfoWorks ICM, XPSWMM and one of the solutions of SWMM4 […]

## Flow Calculator (Simple in Innovyze H2OCalc) – Option for SWMM6?

2.3.1 Flow Calculator (Simple in Innovyze H2OCalc) The Flow Calculator category performs hydraulic calculations for the following elements: Circular Channel, Rectangular Channel, Triangular Channel, Trapezoidal Channel, Irregular Channel, and Pressurized Pipe. Circular […]

## Weirs in Innovyze H2OCalc – Alternative? for SWMM6

3.11 Weirs in Innovyze H2OCalc Discharge in channels and small streams can be conveniently measured by using a weir. Weirs can be categorized in to two: sharp crested and broad crested. Sharp-Crested […]

## Pump Calculations in Innovyze H2OCalc – Alternative? for SWMM6

3.6 Pump Calculations in Innovyze H2OCalc A Pump is used to augment head to the system (water distribution systems or waste water collection systems), and helps to lift water from low lying […]

## Water Hammer in Innovyze H2OCalc

3.14 Water Hammer Surge analysis is important to estimate the worst-case events in the Water Distribution Systems (WDS). Transient regimes in WDS are inevitable and will normally occur as a result of […]

## Moody Friction Factor Calculator from Innovyze H2OCalc

3.3 Moody Friction Factor Calculator Darcy-Weisbach friction factor, f, can be evaluated in terms of equivalent sand grain roughness, e, and Reynolds number, Re. Reynolds number is a dimensionless ratio of inertial […]

## Innovyze H2OCalc Head loss due to Transitions and Fittings (Local loss)

3.7 Head loss due to Transitions and Fittings (Local loss) Whenever flow velocity changes direction or magnitude in a conduit (e.g., at fittings, bends, and other appurtenances) added turbulence is induced. The […]

## Urban Drainage Structures from Innovyze H2OCalc

3.13 Urban Drainage Structures The methodology presented here for analysis and design of the drainage structures described in this section is based on HEC-22 manual (FHWA, 2001) Gutter Flow Gutters are the […]

## General Culvert Information from Innovyze H2OCalc for All Culvert Programs

General Culvert Information from Innovyze H2OCalc for All Culvert Programs A culvert is a pipe that carries water under or through some feature (usually a road or highway) that would otherwise block […]

## What is the minimum depth in a link of #SWMM5 ?

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 […]

## Underdrains for LIDs, SuDs or WSuDs in #SWMM5

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 […]

## Hydraulic Jump, Froude Number and #INSIDE_SWMM5

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 […]

## Extran Hydraulics Master from #Extran3 and #SWMM4 converted to #SWMM5

This is part of the #Inside_#SWMM5 series of blogs and is intended as a visual aid and code developer for the Storm Water Management Model Reference Manuals on https://www.epa.gov/water-research/storm-water-management-model-swmm I always think […]

## How Do the TimeOpen and TimeClose Controls Work in #SWMM 5.1.012

This is part of the #Inside_#SWMM5 series of blogs and is intended as a visual aid and code developer for the Storm Water Management Model Reference Manuals on https://www.epa.gov/water-research/storm-water-management-model-swmm I always think […]

## Simple SI Unit Model for SWMM5 LID with 100 mm Rainfall – Part 2

This blog is a companion to the blog post https://swmm5.org/2017/04/17/swmm5-simple-100-mm-rainfall-model-for-lid-modeling-part-1/ in which a 1 Hectare model with 100 mm of rainfall had a simple Bio-Retention Cell with no LID outflows. In part […]

## #SWMM5 Simple 100 mm Rainfall model for #LID modeling – Part 1

Simple SI Unit Model for SWMM5 LID with 100 mm Rainfall. Reading this blog and using the embedded SWMM 5 example file, you will run a simple SI unit model based on […]

## EPA #SWMM5 Build 5.1.012 (03/14/17) Updates

SWMM 5.1 Update History ======================= https://www.epa.gov/water-research/storm-water-management-model-swmm#downloads ———————— Build 5.1.012 (03/14/17) ———————— Engine Updates: 1. The direct.h header is now only #included in the swmm5.c file when compiled for Windows. (swmm5.c) 2. Engine […]

## Dynamic Wave Routing Options in #InfoSWMM and #SWMM5

Dynamic Wave Routing Options The Dynamic Wave page of the Simulation Options dialog, shown below, sets several parameters that control how the dynamic wave flow routing computations are made. These parameters have […]

## Visualizing 2D Simulation Output in InfoSWMM 2D

Visualizing 2D Simulation Output in InfoSWMM 2D Once the model has been successfully simulated using the Run Manager, you can review the 2D simulation output. 2D Simulation results can be visualized in […]

## How to See the Highest Continuity Errors Table in the Output Report Manager for #InfoSWMM

How to See the Highest Continuity Errors Table in the Output Report Manager for #InfoSWMM In the output text report file of infoSWMM and H2OMap SWMM there is the Highest Node Continuity […]

## How Orifices and Weirs Work in SWMM 5

How Orifices and Weirs  Work in SWMM 5.   The inputs to the orifice flow  calculator are Step 1 If the head in the orifice or the rules for  the  orifice cause […]

## Updated – Innovyze St Venant Solutions for InfoSWMM, InfoSewer, H2OMap SWMM and InfoWorks ICM and InfoWorks ICM SE

The assumptions behind Lumped and Distributed Models along with the assumptions of the St Venant Equations. InfoSWMMH2OMap SWMM, InfoSWMM, H2OMap SWMM, SWMM5, ICM and ICM SE are all Distributed models for Unsteady flow. InfoSWMM and InfoSWMMH2OMap SWMM have options for direct steady flow. ICM and InfoSWMM can also use a quasi steady flow solution. All of these Innovyze models use the Continuity Equation and Momentum equation for routing flows in links.

## Manhole Elevations in InfoSWMM and SWMM 5

Manhole Elevations in InfoSWMM and SWMM 5 Subject: Manhole Elevations in InfoSWMM and SWMM 5 Starting from the bottom of the manhole you have these regions of computational interest: 1.   Manhole Invert to the […]

## What would be the perfect format for a Water Related Engineering Blog?

What would be the perfect format for a Water Related Engineering Blog? A note for my readers.  I am having an internal public discussion with myself.  If you have other ideas or […]

## The four cross sectional areas in a link of SWMM 5 and InfoSWMM

Note: Four cross sectional areas are used in a link of SWMM 5. The weighted hydraulic radius (Rwtd) is a function of the Froude Number of the link and the upstream and […]

## A collage of LID Types in InfoSWMM and InfoSWMM Sustain along with the Process Layers

A collage of LID Types in InfoSWMM and InfoSWMM Sustain along with the Process Layers pic.twitter.com/ePtQPrg3sp — Robert E Dickinson (@RDickinson) March 6, 2015 SWMM5 or SWMM 5 or InfoSWMM LID GIF […]

## Hybrid Learning at Innovyze

Hybrid Learning at Innovyze 1. Help Files with links to Blogs, Forums and Videos 2. Support Emails/Calls with Support linking to Blogs and Videos 3. Blogs, Innovyze and Other Blogs 4. Forums […]

## When is Warning 02 Used in the SWMM 5 Engine?

When is Warning 02 Used in the SWMM 5 Engine? 1. If the crown elevation of the highest connecting link is greater than the maximum depth of the node, then 2. The […]

## Innovyze and Robert Dickinson on Social Media – A Video Guide for WordPress, Blogspot, Twitter, LinkedIn and Ning

Innovyze and Robert Dickinson on Social Media – A Video Guide http://t.co/yAFclJfmkW — Robert E Dickinson (@RDickinson) February 21, 2015

## How to set an internal boundary condition in SWMM 5, InfoSWMM and H2OMap SWMM

How to set an internal boundary condition in SWMM 5, InfoSWMM and H2OMap SWMM Make the internal boundary node a storage node Set the Storage node initial depth Give it a large […]

## Box File Links for SWMM4 and SWMM5 Files

Here are the box file links for each section of the files loaded to Box.  I did not realize when I sent this up that the general public needed a link for […]

## The total losses include both evaporation and infiltration for a 100 Year SWMM 5 Simulation

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

## The Internal Green Ampt Parameters, FUMax, FU and FTOT or F for a 100 Year SWMM 5 Simulation for Green Ampt Infiltration

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM using a QA/QC […]

## Initial Moisture Deficit or IMD for a 100 Year SWMM 5 Simulation for Green Ampt Infiltration

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

## Rainfall and Losses One Watershed for a 100 Year Simulation with SWMM 5 Statistics at a saved time step of one hour.

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

## Runoff from One Watershed for a 100 Year Simulation with SWMM 5 Statistics for Peak, Mean and Total Runoff

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

## My History with Various Versions of SWMM: SWMM3, SWMM4, SWMM5, XP-SWMM and InfoSWMM

Subject:   My History with Various Versions of SWMM: SWMM3, SWMM4, SWMM5, XP-SWMM and InfoSWMMI first learned about SWMM in a brochure from the University of Florida when I was just a 17 […]

## The Link Time Step in SWMM 5, InfoSWMM and H2OMap SWMM

Introduction:  This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM […]

## The Non Linear Term in the Saint Venant Equation of SWMM 5

Subject: Non Linear Term in the Saint Venant Equation of SWMM 5 The flow equation has six components that have to be in balance at each time step: 1. The unsteady flow term or dQ/dt 2. The friction loss term (normally based on Manning's equation except for full force mains), 3. The bed slope term or dz/dx […]

## Hysteresis Effect in the Link Flow versus Depth Relationship in SWMM 5

Subject:  Hysteresis Effect in the Link Flow versus Depth Relationship in SWMM 5 You can often get a hysteresis effect for the Flow versus Depth relationship in SWMM 5 due to the five component St. Venant equation used to simulate the flows (http://swmm5.blogspot.com/2010/12/what-are-units-for-five-st-venant-flow.html) .  A hysteresis effect is having two or more flow values for the same depth value in the link. […]