How Does the Green Ampt Initial Moisture Deficit Work in SWMM 5?

Subject:   How Does the Green Ampt Initial Moisture Deficit Work in SWMM 5?

How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5? by dickinsonre 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 – (FUMax – FU)/Upper Soil Zone Depth ·         FU or current moisture content of the upper zone of the of the soil ·         FUMax which is the saturated moisture content of the upper zone in feet and stays constant during the simulation ·         IMD Max is the user defined Initial soil moisture deficit and is a fraction Figure 1.  How Soil Moisture changes over time. Figure 2.  Soil Moisture and IMD are related – the Soil Moisture has a maximum of IMDMax. via Blogger http://www.swmm5.net/2013/08/how-does-green-ampt-initial-moisture.html

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

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

How Does Green Ampt Cumulative Event Infiltration work in SWMM 5? by dickinsonre 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 event infiltration at the start of a time interval in the internal units of feet in SWMM 5, ·         FU or current moisture content of the upper zone of the of the soil ·         FUMAX which is the saturated moisture content of the upper zone in feet and stays constant during the simulation  Figure 1.  How FTOT, FU and F change over time Figure 2.  A closer look at how FTOT or F and FU Change over time in a Green Ampt Pervious Area Simulation. via Blogger http://www.swmm5.net/2013/08/how-does-green-ampt-cumulative-event.html

LID and BMP Modeling in InfoSWMM and H20Map SWMM

Subject:   LID and BMP Modelling in InfoSWMM and H20Map SWMM

LID and BMP Modeling in InfoSWMM and H20Map SWMM by dickinsonre

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 Connection to the Subcatchments                   Page 5

Simulation Options for LID's                                                                 Page 6

Water Quality Features                                                                             Page 7

External Loading Buildup                                                                    Page 8

Simulation Options for Quality                                                            Page 9

Buildup/Washoff Options                                                                    Page 10

LID's are Unlimited Per Subcatchment                                            Page 11

Map Display of the Number of Units per Subcatchment                Page 12

LID Controls in DB Tables                                                                   Page 13

LID Layers                                                                                            Page 14

LID Storage Layer                                                                                    Page 15

LID Process Components Page                                                            Page 16

LID Processes                                                                                           Page 17

LID Usage in DB Tables                                                                         Page 18

LID Usage at the Subcatchments                                                        Page 19

Rain Barrel LID                                                                                        Page 20

Swale LID                                                                                                   Page 21

Components Per Subcatchment                                                       Page 22

LID Report Variables                                                                           Page 23

LID Report Text File                                                                            Page 24

LID Summary Report                                                                          Page 25

LID Report at a Time Step                                                                   Page 26

LID Graphs by Subcatchment                                                              Page 27

LID Import and Export to SWMM                                                         Page 28

 Figure 1.  LID Options include on a Subcatchment include Rain Barrels, Bio-Retention Cells, Infiltration Trench, Porous Pavement and Vegetative Swales

via Blogger http://www.swmm5.net/2013/08/lid-and-bmp-modeling-in-infoswmm-and.html

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How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt?

Subject:  How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt?

How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt? by dickinsonre Subject:  How does the Infiltration Maximum Time to Drain the Upper Soil Zone Work in SWMM 5 Green Ampt? You can use the monthly soil recovery factor (Figure 1) in SWMM 5 to change how the Infiltration Maximum Time to Drain the Upper Soil Zone (Figure 2) is computed each month during a continuous simulation.  The  depth of the upper soil zone in the internal  SWMM 5 units of feet is calculated at the start of the simulation based on the Green Ampt Soil Saturated Hydraulic Conductivity Upper Soil Zone Depth = 4  * (Soil Saturated Hydraulic Conductivity * 12 * 3600)^0.5 / 12 And the Upper Zone Moisture Depletion Factor  and Infiltration Maximum Time to Drain the Upper Soil Zone is calculated at each hydrology time step in SWMM 5. Upper Zone Moisture Depletion Factor  = Upper Soil Zone Depth / 300 * 12 /3600 * Monthly Evaporation Recovery Factor Infiltration Maximum Time to Drain the Upper Soil Zone = 6 / (100 * Upper Zone Moisture Depletion Factor  ) Figure 1.  Monthly Soil Recovery Factor Figure 2.  Infiltration Maximum Time to Drain the Upper Soil Zone for a Subcatchment via Blogger http://www.swmm5.net/2013/08/how-does-infiltration-maximum-time-to.html

Convolution of the RDII UH from R, T and K in SWMM 5

Subject:  Convolution of the RDII UH from R, T and K in SWMM 5

Convolution of the RDII UH from R, T and K in SWMM 5 by dickinsonre Subject:  Convolution of the RDII UH from R, T and K in SWMM 5 The convolution uses the value of R and the Time Base to estimate the amount of Infiltration and Inflow in the Sewer Network.  The short, medium and long term UH's are estimated at each Wet Hydrology time step to make a smooth hydrograph out of the R, T and  K parameters of the Rainfall Dependent Infiltration and Infiltration Method (Figure 1).  The three UH's can be displaced as well if you use the RTK storage parameters (Figure 2) Figure 1.  The short, medium and long UH's are convoluted in SWMM 5 from the Rainfall Time Series. Figure 2.   The Initial Abstraction Depth can be used to shift the generated UH in time or reduce the peak flow and total volumes. c. via Blogger http://www.swmm5.net/2013/08/convolution-of-rdii-uh-from-r-t-and-k.html

Node Comparison in InfoSWMM and InfoSewer

Node Comparison in InfoSWMM and InfoSewer by dickinsonre Note:  Node Comparison in InfoSWMM and InfoSewer  1)    Is there an option to set the manhole sealing method (i.e. locked  or unlocked) in InfoSWMM?  You set the Surcharged depth to a positive value to prevent flooding and keep the pipes under pressure.  You will still have flooding once the water surface elevation reaches the maximum depth + surcharge depth.  Unlike inInfoSewer the depths are not unlimited.  2)    Is defining manhole diameter in InfoSWMM available?  You can set the default surface area of a node or make it a storagenode.    3)    Does InfoSWMM allow me to create parallel pipes with the same  attributes similar to InfoSewer?  You can set the number of barrels in the attribute browser of DB Editor in InfoSWMM.    4)    Can you please confirm that the only element allowed to leave a  storage unit in InfoSWMM is a pump?  No, this is not true.  You can have a gravity main, orifice or weir leave a storage pond or lake.  5)    Is there a tool to check for pipe diameter discrepancies in  InfoSWMM similar to InfoSewer?  Yes, we have a similar Engineering Review and Network Audit Tools 6)    For load patterns, I do not see an option between stepwise and  continuous in InfoSWMM, or is there?  InfoSWMM really only has stepwise linear DWF pattern though you can have a time series of inflows as well which gives you complete flexibility.  7)    Does InfoSWMM offer modeling I&I using pipe length, pipe surface  area etc… like in InfoSewer?   You can but there in not an easy translation,  You have Rainfall Induced Infiltration at a Node. You can relate this to the pipe length but it is not straightforward.  8)    Is steady state simulation and design simulation available in  InfoSWMM similar to InfoSewer?  You can do Steady State easily but design uses a Genetic Algorithm technique if you have InfoSWMMSuite. via Blogger http://www.swmm5.net/2013/08/node-comparison-in-infoswmm-and.html

How is the Mass Balance Calculated in the SWMM 5 Groundwater Component?

Subject:   How is the Mass Balance Calculated in the SWMM 5 Groundwater Component?

How is the Mass Balance Calculated in the SWMM 5 Groundwater Component? by dickinsonre Subject:   How is the Mass Balance Calculated in the SWMM 5 Groundwater Component? The groundwater component of SWMM 5 is found in the gwater.c code.  It (as is all of SWMM 5) is excellently written in small functions by Lew Rossman of the EPA during the SWMM 5 development process.  However, code being code sometimes it is easier to see how the code is functioning.  This blog or note tries to show the mass balance local function updateMassBal The groundwater component consists of groundwater data (gw in the equation) and aquifer data (a) in the equation.  The equation for the groundwater mass balance is shown in Figure 1.   The infiltration, evaporation occur only over the perviousarea but the percolation out the bottom of the aquifer occurs over the whole Subcatchment. Figure 1.  Groundwater Mass Balance via Blogger http://www.swmm5.net/2013/08/how-is-mass-balance-calculated-in-swmm.html

Aquifer and Groundwater Objects in SWMM 5

Subject:   Aquifer and Groundwater Objects in SWMM 5

Aquifer and Groundwater Objects in SWMM 5 by dickinsonre Subject:   Aquifer and Groundwater Objects in SWMM 5  There are two types of data objects in SWMM 5 to describe the Groundwater flow component.  There is a Groundwater data object associated with a Subcatchment that describes flow equations, the interaction between the Subcatchment infiltration and the Groundwater component and an Aquifer data object that describes the characteristics of the Aquifer that may span one or more Subcatchments.  The Groundwater data is specific to one Subcatchment but the Aquifer may    via Blogger http://www.swmm5.net/2013/08/aquifer-and-groundwater-objects-in-swmm.html

Infiltration Data in SWMM 5

Subject:  Infiltration Data in SWMM 5

Infiltration Data in SWMM 5 by dickinsonre Subject:  Infiltration Data in SWMM 5 If you are using Non linear Reservoir Modeling in SWMM 5 there are 1.   Five parameters for Horton Infiltration, 2.   Three parameters for Green-Ampt and 3.   Two parameters for CN infiltration, one parameter (conductivity) has been deprecated by the EPA in SWMM 5.   The Drying Time is used to regenerate the Infiltration Rate for continuous simulation.  Only two parameters are now used for CN infiltration:  The CN value itself and the drying time.    via Blogger http://www.swmm5.net/2013/08/infiltration-data-in-swmm-5.html

3 Types of Subcatchment Flow in SWMM 5

Subject:   3 Types of Subcatchment Flow in SWMM 5

3 Types of Subcatchment Flow in SWMM 5 by dickinsonre Subject:   3 Types of Subcatchment Flow in SWMM 5  1.   Impervious area with depression storage in which the runoff from the precipitation is delayed due to the depression storage.  Evaporation occurs based on the depth of water in the subarea of the Subcatchment. 2.   Impervious area without depression storage in which the runoff from precipitation is NOT delayed.  Evaporation does occur based on the depth of water in the subarea of the Subcatchment. 3.   Pervious area with depression storage in which the runoff from the precipitation is delayed due to the depression storage.  Evaporation and Infiltration occurs based on the depth of water in the subarea of the Subcatchment.    via Blogger http://www.swmm5.net/2013/08/3-types-of-subcatchment-flow-in-swmm-5.html

A Two-Dimensional Quality Mesh Generator and Delaunay Triangulator - InfoSWMM 2D Reference

Subject:   InfoSWMM 2D Reference for “A Two-Dimensional Quality Mesh Generator and Delaunay Triangulator”

Source:   http://www.cs.cmu.edu/~quake/triangle.html

InfoSWMM 2D Layer Properties and Mesh Results

Subject:   InfoSWMM 2D Layer Properties and Mesh ID

You can use the Layer Properties for layers in the Table of Contents to see the Mesh ID and other simulation data for the 2D mesh in InfoSWMM 2D.  The Mesh ID can be seen using the Labels/Label Expression command and if you use an expression you can see the results data as well on the mesh.  The Mesh ID is used as the label as well in the 2D Output modeling report.  The Net Inflow and Net Outflow is by Mesh ID.  In this example, the flow comes out of Node 80408 to Mesh ID 131 and enters the 1D network again at Mesh ID 848.

InfoSWMM 2D Layer Properties and Mesh ID

Subject:   InfoSWMM 2D Layer Properties and Mesh ID

InfoSWMM 2D Layer Properties and Mesh ID by dickinsonre Subject:   InfoSWMM 2D Layer Properties and Mesh ID You can use the Layer Properties for layers in the Table of Contents to see the Mesh ID and other simulation data for the 2D mesh in InfoSWMM 2D.  The Mesh ID can be seen using the Labels/Label Expression command and if you use an expression you can see the results data as well on the mesh.  The Mesh ID is used as the label as well in the 2D Output modeling report.  The Net Inflow and Net Outflow is by Mesh ID.  In this example, the flow comes out of Node 80408 to Mesh ID 131 and enters the 1D network again at Mesh ID 848. via Blogger http://www.swmm5.net/2013/08/infoswmm-2d-layer-properties-and-mesh-id.html