# Day: August 9, 2013

## SWMM 5 Inlet Control Culvert Equations

Subject:   SWMM 5 Inlet Control Culvert Equations

The newer option for SWMM 5 culverts uses three culvert classifications and associated equations to compute the inletcontrolled flow into a culvert using the FHWA (1985) equations.  The culvert code in the culvert.c code of SWMM 5 uses:

## How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5?

Subject:   How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5?

This graph shows the values of the internal SWMM 5 parameters for Green Ampt Infiltration for the pervious area of a Subcatchment during a simulation.  The parameters are:

·         Soil Moisture = IMD Max – Read the rest

## High and Low Estimates of ICM Subcatchment Dimension for SWMM Hydrology

High and Low Estimates of ICM Subcatchment Dimension for SWMM Hydrology

These are the estimates for both SWMM 5, InfoSWMM and ICM SWMM Hydrology, the low estimate is 0.2*SQRT(Area in Feet) and the High Estimate is 5*SQRT(Area in Feet), Figure 1.  You can use higher or lower numbers to calibrate Read the rest

## How do V-notch weirs work in SWMM 5?

How do V-notch weirs work in SWMM 5?

Hi Keith, As you change the Length which is actually the Top Width you change the area and hydraulic radius of the Weir.

The height of a V-Notch weir is the Height Value in the SWMM 5 Weir Property Dialog (Figure 1) Read the rest

## How to Import Subcatchments from GIS into InfoSWMM

How to Import Subcatchments from GIS into InfoSWMM

Step 2:  Your imported shape file has no subcatchment data before we initialize the project.

Step 3:  Add your subcatchment data using the GIS Exchange Cluster Import

Step 4:  Now you have

## How are Flooded Time, Surcharged Time and Flooded Volume Calculated in InfoSWMM and H2OMAP SWMM?

How are Flooded Time, Surcharged Time and Flooded Volume Calculated in InfoSWMM and H2OMAP SWMM?

The timevolume and flooded rate shown in the InfoSWMM and H2OMAP SWMM Report File Node Flooding Summary (Figure 2) are calculated as follows (Figure 1):

For All Nodes NOT Outfalls ( this includes Read the rest

## Inflow Time Series in InfoSewer

This is how InfoSewer can use a time series of inflow at a specific node:

1.       Use a mean loading of 1 so that the values in the Inflow Time Series stay the same as your inflow units in InfoSewer (Figure 1)

## How to Use the Map Display for the Maximum Adjusted d/D or Maximum q/Q in an EPS InfoSewer Simulation

How to Use the Map Display for the Maximum Adjusted d/D  or Maximum q/Q in an EPS InfoSewer Simulation

You can do a Map Display of the adjusted d/D values (Figure 1)  from the Gravity Main Range Report (Figure 2) to show those pipes Read the rest

## LID and BMP Modeling in InfoSWMM and H20Map SWMM

Subject:   LID and BMP Modelling in InfoSWMM and H20Map SWMM

The attached PDF file describes some of the Low Impact Modeling and Best Management Practice modeling options in InfoSWMM and H2OMap SWMM (Figure 1)

Low Impact Development (LID)                                                           Page 3

Low Impact Development (LID)                                                           Page 4

LID Controls and

## Steps in Using RDII Analyst for InfoSWMM, ICM and InfoSewer

Subject:  Steps in Using RDII Analyst for InfoSWMM, ICM and InfoSewer

Step 1: Create a Base UH  in the Operation Tab of the Attribute Browser using RDII Analyst (Figure 1)

Step 2: Assign a UH to at Least 1 Node Using the Inflow Icon

Step 3: Open Up RDII Analyst

## InfoSewer Flow Attenuation Sensitivity

InfoSewer Flow Attenuation Sensitivity

The three Run manager parameters, Maximum Number of Segments, Minimum Travel Distance and the Minimum Travel Distance in InfoSewer and H2OMAP Sewer affect the shape and flow attenuation of the flow in a link.  The effect of using the flow attenuation is to reduce the peak Read the rest

## InfoSWMM 2D Report Variables

InfoSWMM 2D Report Variables

The Junction Graph variables for 2D Depth, 2D Speed, 2D Froude Number, 2D Unit Flow, 2D Inflow, 2D Volume and 2D Angle for a InfoSWMM 2D simulation for up to 1000 years can be plotted in the Report Manager of InfoSWMM.  This is an image Read the rest

## How are Negative Transect Elevations Used in SWMM5?

Subject:   How are Negative Transect Elevations Used in SWMM5?

You can have negative elevations in the Transects of SWMM 5 as the elevations are transformed internally to relative depths above the node inverts in the SWMM 5 engine (Figure 1).   The slope of the link is calculated from the Read the rest

## How Does Green Ampt Cumulative Event Infiltration work in SWMM 5?

Subject:   How Does Green Ampt Cumulative Event Infiltration work in SWMM 5?

This graph shows the values of the internal SWMM 5 parameters for Green Ampt Infiltration for the pervious area of a Subcatchment during a simulation.  The parameters are:

·         F or FTOT which is the cumulative eventRead the rest

## How is Capillary Suction Head Used in SWMM 5 Green-Ampt?

Subject:   How is Capillary Suction Head Used in SWMM 5 GreenAmpt?

How sensitive is the infiltration loss and rate to the capillary suction head parameter in the SWMM 5 GreenAmpt  infiltration method.   Figure         1 shows how the total infiltration loss and total loss rate vary Read the rest

## How is the Soil Saturated Conductivity Used in SWMM 5 Green-Ampt?

Subject:   How is the Soil Saturated Conductivity Used in SWMM 5 GreenAmpt?

How sensitive is the infiltration loss and rate to the Soil Saturated Conductivity parameter in the SWMM 5 GreenAmpt  infiltration method.   Figure 2 shows how the total infiltration loss and total loss rate Read the rest

## There are Four factors in Rainfall Dependent Infiltration and Inflow or RDII in SWMM 5

There are Four factors in Rainfall Dependent Infiltration and Inflow or RDII in SWMM 5:

1.   The fractional response to Rainfall or R from 0 to 1

2.   The Time Base of the Unit Hydrograph or T in hours * Dimensionless K Shape Factor

3.   The Sewershed Contributing Area Read the rest

## How is RDII Storage Simulated in SWMM 5?

Subject:  How is RDII Storage Simulated in SWMM 5?

If you are using the SWMM 5 Rainfall Dependent Infiltration and Inflow(RDII)  feature you can also use the RDII storage parameters to change the RDII runoff by simulating the storage in the Sewershed.   The code in RDII.C Read the rest

## Types of Stormwater Inlets from HEC12 and HEC22

Note:  Types of Stormwater Inlets from HEC12 and HEC22

Stormwater Inlets consist of four main types (http://onlinemanuals.txdot.gov/txdotmanuals/hyd/storm_drain_inlets.htm) with most common shown in Figure 1.

1.   Curb opening inlets either at a sag or continuous on the street,

2.   Grate Inlets either at a sag or in combination Read the rest

## How to Easily Make a Smaller Model in InfoSWMM Using Trace Upstream Network

Subject:   How to Easily Make a Smaller Model in InfoSWMM Using Trace Upstream Network

Step 1.  Use the Trace Upstream Network command to find all of the network above the node of interest (Figure 1).

Step 2.  Use the Trace Downstream Network Command to find all of the network below Read the rest

## How to Subdivide Subcatchments in SWMM 5

Subject:   How to Subdivide Subcatchments in SWMM 5

If you want to subdivide a larger Subcatchment in SWMM 5 and get around the same peak flow then a good suggestion would be to make sure that (Figure 1):

1.   The sum of the new areas equals the original Subcatchment Area Read the rest

## What are the Types of Force Mains (FM) in SWMM 5?

Subject:   What are the Types of Force Mains (FM) in SWMM 5?

There are five ways to model a force main in SWMM 5 for the combination of full and partial flow in the force main (Figure 1):

1.       Full Flow using Darcy-Weisbach for the friction lossRead the rest

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