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How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5?

Subject:   How is the St Venant Equation Solved for in the Dynamic Wave Solution of SWMM 5? An explanation of the four St. Venant Terms in SWMM 5 and how they change for Gravity Mains and Force Mains. The HGL is the water surface elevation in the upstream and downstream nodes of the link. The HGL for a full link goes from the pipe crown elevation up to the rim elevation of the node + the surcharge depth of the node.  The four terms are: dq2 = Time Step * Awtd * (Head Downstream – Head Upstream)…See More
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Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow

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SWMM 5 Precipitation Options

Subject:  SWMM 5 Precipitation Options You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative precipitation, use both rainfall and snowfall in the same rain gage depending on temperature, use both time series or external files for the rain gage and have unlimited rain gages with the limitation of one rain gage per subcatchment.  …See More
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SWMM 5 Precipitation Options

Subject:  SWMM 5 Precipitation Options You can have design storms, monitored storms of any length of the time from minutes to centuries, use intensity, volume or cumulative precipitation, use both rainfall and snowfall in the same rain gage depending on temperature, use both time series or external files for the rain gage and have unlimited rain gages with the limitation of one rain gage per subcatchment.  …See More
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Hi,

This is about the control rules.

I am trying to simulate a network with the help of control rules.

Total simulation period is 2 hrs and 30 minutes, however, I'm running the simulation part by part. Eg 0 to 15 minutes, 15 to 30 minutes, 30 to 45 minutes and so on.

I wanted to input the state of the storage tanks, nodes, conduits of the previous simulation to the next simulation. 

As an example, the depth of the tank1 at 15 minutes from 0 to 15 minutes simulation should be input to the 15 to 30 minutes simulation. This is to keep the mass balance.

 

I think the depths can be input using the following control rule. But, I am not sure. If these are incorrect, please let me know the correct rules too.

 

IF SIMULATION CLOCKTIME = 00:15:00

THEN Tank1 DEPTH = 0.4

AND Tank2 DEPTH = 0.5

AND Node1 DEPTH = 0.3

AND Conduit1 DEPTH = 0.15

 

However, I wanted to input the pollutant concentration levels at these locations.

There are 5 different pollution constituents and if the above control rules are correct, please reveal me the control rules to feed the pollution concentration levels.

 

The second question is;

What will be the maximum number of control rules that I can insert to the simulation. I  mean is there a maximum number of control rules that we can use?

 

Thanks a lot. 

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Hi, You cannot set the concentrations using the control rules.

Hi Robert,

Thanks a lot for letting me know.

How should I set the water depths at nodes for a given time?

I tried the following, but it gives me an error report with "invalid keyword NODE at line ..."

 

RULE R1a

IF SIMULATION CLOCKTIME = 00:15:00

THEN NODE TANK1 DEPTH = 0.4

 

Thanks again.

 

 

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