SWMM56

Subject:    InfoSWMM 2D Reference for “A Two-Dimensional Quality Mesh Generator and Delaunay Triangulator” Source:    http://www.cs.cmu.edu/~quake/triangle.html

Subject:   SWMM 5 Clocktime RTC Rules for Pumps, Weirs and Orifices You can use the Control or RTC rules in SWMM 5 to adjust the settings of the weirs, pumps and orifices based on the clock time each day of your simulation.  Here is an example that will adjust orifice height every ½ hour for 7 orifices at one time using two sets of rules. RULE R1a  ; Half hour setting IF SIMULATION CLOCKTIME = 0:30:00  OR SIMULATION CLOCKTIME = 1:30:00   OR SIMULATION CLOCKTIME = 2:30:00  OR SIMULATION CLOCKTIME = 3:30:00  OR SIMULATION CLOCKTIME = 4:30:00  OR SIMULATION CLOCKTIME = 5:30:00  OR SIMULATION CLOCKTIME = 6:30:00  OR SIMULATION CLOCKTIME = 7:30:00  OR SIMULATION CLOCKTIME = 8:30:00  OR SIMULATION CLOCKTIME = 9:30:00  OR SIMULATION CLOCKTIME = 10:30:00 OR SIMULATION CLOCKTIME = 11:30:00 OR SIMULATION CLOCKTIME = 12:30:00  OR SIMULATION CLOCKTIME = 13:30:00   OR SIMULATION CLOCKTIME = 14:30:00  OR SIMULATION CLOCKTIME = 15:30:00  OR SIMULATION CLOCKTIME = 16:30:00   OR SIMULATION CLOCKTIME =

Subject:   Hot Start Files are used to define the initial  heads and flows in the nodes and links of the model. The creation of the Hot Start File for your sanitary, combined or stormwater network is a three step process: 1.    Save the 1 st Hot Start file using an empty system as the initial conditions, 2.    Use the 1 st Hot Start file as the initial condition in the second run and Save the 2 nd Hot Start File 3.    In the 3 rd Run Use the 2 nd Hot Start file as the initial conditions of your network. 4.    It is not necessary that the Hot Start Files be exact in the initial depths or flows but only approximate so that the network in not empty.  

Subject:   InfoSewer and InfoSWMM Nodes InfoSewer and InfoSWMM are link/node networks but the nodes are of different types in both models.  InfoSewer has a distinction between loading manholes or junctions and chamber junctions that start or separate Force Main links.  InfoSewer nodes are types 1 through 4 and InfoSWMM nodes are types 5 through 8 in this image. InfoSWMM has more generic node types than in InfoSewer so a junction can be both a Loading and Chamber Manhole if you are more familar to the InfoSewer names.

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.

Subject:    InfoSWMM 2D Layer Properties and Mesh ID InfoSWMM   2D   Layer   Properties  and  Mesh   ID by  dickinsonre Subject:     InfoSWMM   2D   Layer   P roperties  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

Subject:  Steady State Flow Analysis in InfoSWMM using an External Flow Time Series Steady State Flow Analysis in InfoSWMM using an External Flow Time Series by  dickinsonre Subject:   Steady   State   Flow   An alysis  in  InfoSWMM   using  an External  Flow  Time Series This can be easily created  using  a few steps in  InfoSWMM .  The  flow   ramp  is in the Routing Interface File.  The advantage is that you are able to have different ramps for the various nodes  using  this  method . Step 1:   In Run Manager Set up the  Process Models Options  to use just the  External Inflow  and NOT the  Dry Weather  Flow Step  2 .  Create the External Inflows File (see the help file for the format) SWMM5 Interface File 300  - reporting time step in sec 1    - number of constituents as listed below: FLOW  CFS 2     - number of nodes as listed below: 36 24 Node             Year Mon Day Hr  Min Sec  FLOW       36               2002 01  01  00  00  00  0.000000  24               2002 01  01  00  00 

Subject:  Steady State Flow Analysis in InfoSWMM using a Ramp DWF Steady State Flow Analysis in InfoSWMM using a Ramp DWF by  dickinsonre Subject:   Steady   State   Flow   An alysis  in  InfoSWMM   using  a  Ram p   DWF   This can be easily created  using  a few steps in  InfoSWMM .    Step 1:   Using  Scenario Explorer make a cloned Child Scenario and a cloned  DWF  Set which will be later modified.     Step  2 :   Using  DB Manager and the BlockEdit tool and increase the mean  DWF  by a factor of 10, 100 or 1000 to drown out all Wet Wells and cause the pumps to turn on and stay turned on during the simulation in the newly created  DWF  Set.     Step 3.   Run the batch manager and create two output files – Normal and  Steady   State  for comparison.   Step 4.   You can now compare the two scenario's  using  Output Manager and the Compare Graph tool.  The Ramped Model should have constant flows in both links and pumps.  It was not necessary to change any of the patterns. Step 5.  

Subject:   SWMM 5 Fixed Surface Water Depth Boundary Condition A large difference between SWMM 5 and SWMM 4 is how the Groundwater Aquifer interacts with the drainage network.  In SWMM 4 since the hydrology was simulated in the Runoff Block , the results saved to an interface file and the hydraulics were simulated in the Extran Block it was not possible to have a time step to time step interaction between the Aquifer and the Open Channels.  SWMM 5 has integrated hydrology and hydraulics so it is possible to use either a Fixed Surface Water Depth for each Subcatchment or the Receiving Nodes Node Depth Invert Elevation – the Aquifer Bottom Elevation.  The groundwater thus flows either to a fixed boundary condition as in SWMM 4 or to a time varying boundary condition.

Subject:   SWMM 5 Threshold Groundwater Elevation A large difference between SWMM 5 and SWMM 4 is how the Groundwater Aquifer interacts with the drainage network.  In SWMM 4 since the hydrology was simulated in the Runoff Block , the results saved to an interface file and the hydraulics were simulated in the Extran Block it was not possible to have a time step to time step interaction between the Aquifer and the Open Channels.  SWMM 5 has integrated hydrology and hydraulics so it is possible to use either a fixed Threshold Groundwater Elevation for each Subcatchment or the Receiving Nodes Invert Elevation.

Subject:    Aquifers in SWMM 5 Aquifers in SWMM 5 by  dickinsonre Subject:    Aquifers in SWMM 5   Groundwater  in  SWMM   5  is  model ed  as  two   zones : (1) Saturated and (2) Unstaturated.  The data for the  Groundwater  Simulation consists of physical data in an Aquifer and elevation and flow coefficient and exponent data in the  Groundwater Data.  The Aquifer data object can be applied to multiple Subcatchments but each Subcatchment has its own set of  Groundwater data.  For example, in this model all of the Subcatchments share the same Aquifer data but each Subcatchment has different elevation and flow data – the labels on the basin are the  groundwater  elevations. via Blogger  http://www.swmm5.net/2013/08/ aquifers-in-swmm-5.html

Subject:    3 Types of Manholes in SWMM 5 and InfoSWMM There are three types of interior manholes in SWMM 5 and InfoSWMM as regards water surface elevations above the Node Rim Elevation: 1 st  Excess Water leaves the Node as flooded water if the water surface elevation equals the Rim Elevation ( Figure 1  and Gravity Mains), 2 nd  Excess Water is  stored in the manhole as pressurized depth if the Node Surcharge Depth is used ( Figure 2  and Force Mains) 3 rd  Excess Water is stored above the Node Rim Elevation (Surface Ponding and  Figure 3 )     Figure 1.   The default node in SWMM 5 and InfoSWMM has just the Manhole Invert Elevation, the program calculated elevation of the highest connected link and the Node Maximum Depth or Rim Elevation.  If the Water Surface Elevation exceeds the Rim Elevation then any excess flow is lost as flooded flow.     Figure 2.   A force main or pressure in SWMM 5 and InfoSWMM has the Manhole Invert Elevation, the program calculated elevation of the highes

Subject:   InfoSWMM and Arc GIS Layer Properties for Force Mains and Gravity Mains An important advantage of using InfoSWMM is the ability to use all of the Arc GIS layer and programming tools.  For example, you can use the layer properties in the Table of Contents to color and create symbols for the force mains and gravity mains in InfoSWMM.  The Force Main variable (which is a Yes/No parameter) is selected as the field value in the Symbology Tab of Layer Properties which allows you to color and size the link based on the Force Main property of is you do a Layer Join the link property and simulation results.

Subject:   Wet Well Maximum depths and Pump Start and Pump Off Depths     The  Wet Well  has ·           An invert elevation and ·           A Maximum Depth The  Pumps  have ·           Pump On Depth ·           Pump Off Depth ·           Pump Head – Discharge Curve or ·           RTC Rules The  Links  have a ·           Invert Elevation into the Wet Well and ·           Invert Elevation into the Downstream Force Main ·           Crown Elevation Figure 1. Wet Well  Maximum Depth

Note:    InfoSWMM  or SWMM 5 Basic Runoff and Other Wet Weather Processes Figure 1:   Possible Sources of Input flow and Output Losses or Outflow Figure 2:   Variables and Pathways on a Subcatchment Surface Figure 3:   Subcatchment Pathways for Rainfall in SWMM 5

Subject:   Detention Pond Infiltration and Evaporation Losses You can also add a storage pond infiltration and surface evaporation losses to the pond.  The surface evaporation is added to the infiltration (computed from the green ampt parameters); a storage volume summary listing the average and maximum volume and the percent loss from the combined infiltration and evaporation from the ponds.  The pond infiltration loss during a time step is basd on the areal weighed average depth, the Green Ampt infiltration and the Area of the pond. infiltration_detetention_pond.inp Download this file Detention Pond Infiltration and Evaporation Losses in SWMM 5 by  dickinsonre Subject:    Detention   Pond   Infil tration  and  Evaporation   Losses   You can also add a storage  pond   infiltration  and surface  evaporation   losses  to the  pond .  The surface  evaporation  is added to the infiltration  (computed from the green ampt parameters); a storage volume summary listing the average and maximu

Subject:   Detention Basin Basics in SWMM 5 What are the basic elements of a detention pond in SWMM 5?  They are common in our backyards and cities and just require a few basic elements to model.  Here is a model in SWMM 5.0.022 that even has a fountain in the real pond – which we not model for now.   The components of the model are: 1.    An inlet to the pond with a simple time series – a subcatchment can be added to it in a more complicated model but for now we will just have a triangular time series, 2.    A pipe to simulate the flow into the pond from the inlet, 3.    A Storage Node to simulate the Pond that consists of a tabular area curve to estimate the depth and area relationship, 4.    A Storage Node to simulate the Outlet Box of the Pond 5.    Two Small Rectangular Orifices to simulate the low flow outflow from the pond at an elevation less than the weir 6.    A large rectangular orifice to simulate the normal inflow to the Box 7.    A rectangular weir to simulate the flo

Note:  Steady State InfoSewer solution solves for the link flow and node heads Here is an example of how the Steady State InfoSewer solution solves for the link flow and node heads or depths: •          1 ST Flow is computed in each link and d and d/D is calculated based on pipe flow and manhole loading data and not the adjusted data from the 2 nd pass. •          2 nd InfoSewer adjusts the link depth based on the manhole head and lists the adjusted depth in the browser and the Report Table after the manhole depths are calculated from downstream to upstream in the network. •          Result: The HGL graph shows the link d and d/D based on pipe flow not the adjusted depth so you are looking at the results of the 1 st pass in the links and the 2 nd Pass in the Nodes in a HGL Plot  for a Steady State Simulation. Here is one example of this sequence of events: The downstream head at the outfall causes a backwater condition in all of the links.  The d/D and q/Q is based on the manhole