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
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… Read the rest
Subject: How is Capillary Suction Head Used in SWMM 5 Green-Ampt?
How sensitive is the infiltration loss and rate to the capillary suction head parameter in the SWMM 5 Green-Ampt infiltration method. Figure 1 shows how the total infiltration loss and total loss rate vary … Read the rest
Subject: How is the Soil Saturated Conductivity Used in SWMM 5 Green-Ampt?
How sensitive is the infiltration loss and rate to the Soil Saturated Conductivity parameter in the SWMM 5 Green-Ampt 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:
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
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
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
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
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
Subject: What are the Types of Force Mains (FM) in SWMM 5?
Force Mains in SWMM 5 can be modeled in several ways, depending on whether the flow within the pipe is full (the pipe is completely filled with fluid) or partial (the pipe is not completely … Read the rest
Subject: How Does a TYPE1 Pump Work in SWMM 5?
A SWMM 5 Type1 pump is called an offline pump but the name comes from SWMM 4 and the Pump is controlled by volume instead of depth or head as in the SWMM 5 TYPE2, TYPE3 and TYPE4 Pumps. The
Subject: How is the Orifice Setting Used in SWMM 5 RTC Rules?
The Real Time Control Rule for Orifice Setting can be a function of a Setting constant, Setting from a Curve, Setting from a PID controller and a Setting from a Time Series (Figure 1). The Setting affects … Read the rest
Subject: Low Impact Development Options in H2OMAP SWMM and InfoSWMM
The five options are:
1. Rain Barrel
2. Bio Retention Cell
3. Infiltration Trench
4. Vegetative Swale
5. Porous Pavement
and be entered as controls in the Hydrology Section of the Operations Browser of H2OMAP SWMM or InfoSWMM (Figure 1)… Read the rest
Subject: Rules for NRSCS Unit Hydrographs in InfoSWMM and H2OMap SWMM
Rules or Guidelines for NRSCS Unit Hydrographs if used as the Hydrology Option in InfoSWMM and H2OMAP SWMM:
1. The Unit Hydrograph CN comes from the Subcatchment Table and the NRCS_CN Column
2. Time of Concentration is from the … Read the rest
Subject: How to Export all of your Data to a Shapefile Using InfoSWMM
You can do this easily by using three steps which are shown in Figure 1, Figure 2 and Figure 3.
Figure 1. Export Manager Tool
Figure 2. Link and Node Export Options
Figure 3. Parameter options for … Read the rest
Subject: How to use the Flow Splitter in InfoSewer for Dendritic Networks
InfoSewer, which is an extension in Arc Map, does need to have slit split defined where gravity mains merge together to determine the amount of flow in each of the downstream conduits (Figure 1). The options for … Read the rest
Subject: A SWMM 5 Model made from the Art of Jack Yerka
The attached example SWMM 5 model has small rectangular conduits with a constant inflow based on a background image from Jack Yerka.
via Blogger http://www.swmm5.net/2013/08/a-swmm-5-model-made-from-art-of-jack.html… Read the rest
1. Make an Output Relate (using the Operations Tab of the H2OMAP SWMM Browser) which will be the same as the Pipe Summary Table in