Day: August 9, 2013

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

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)

 

Figure 1.   Load with a Pattern of InflowRead 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

Read the rest

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

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

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

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