Example VSP Pump in SWMM 5 - Version 1

Subject:   Example VSP Pump in SWMM 5 - Version 1

Here is one way to model multiple pumps between the same downstream and upstream nodes using the pump curves and the Real Time Control Rules (RTC) in SWMM 5.  Here are the steps:

1.   Enter the data for three pumps in the browser by using the Add Pump Icon
2.   Enter three Pump Head/Flow Curves so that the 2nd and 3rd Pump Curves are the sum of the flows in the 1st and 2nd Pumps together and the sum of the flows in the 1st, 2nd and 3rd respectively for the 2nd and 3rd Pump Curves

3.   Enter a RTC Rule in the Control Editor so that when the 1st Pump is turned on – the 2nd and 3rd Pump is turned off
4.   Enter a RTC Rule in the Control Editor so that when the 2nd  Pump is turned on – the 1st  and 3rd Pump is turned off
5.   Enter a RTC Rule in the Control Editor so that when the 3rd  Pump is turned on – the 1st and 2nd Pump is turned off

Using these rules you can see that for the 1st Pump turns on when the Node WetWell has a depth below 2 feet, the 2nd Pump turns on when the Node is between a depth of 2 to 5 feet and the 3rd Pump turns on when the Node Depth is above 5 feet.

RULE Pump1
IF Node WetWell Depth <= 2
THEN PUMP PUMP2 STATUS = OFF
AND PUMP PUMP3 STATUS = OFF
Priority 1

RULE Pump2
IF Node WetWell Depth > 2
AND Node WetWell Depth <= 5
THEN PUMP PUMP1 STATUS = OFF
AND PUMP PUMP3 STATUS = OFF
Priority 2

RULE Pump3
IF Node WetWell Depth > 5
THEN PUMP PUMP1 STATUS = OFF
AND PUMP PUMP2 STATUS = OFF
Priority 3


Comments

Post a Comment

Popular posts from this blog

Orifice and Weir flow calculations

Note: Orifice and Weir Flow Computations The orifice flow calculation proceeds as follows: 1. Initially and whenever the setting (i.e., the fraction opened) changes, flow coefficients for both orifice and weir behavior are computed as follows: a. For side orifices: Define Hcrit = h/2 where h is the opening height. b. For bottom orifices: i. For a circular orifice, compute area over length (i.e., circumference) as AL = h /4. ii. For a rectangular orifice compute AL = h*w/(2*(h+w)) where w is the opening width. iii. Compute Hcrit = Cd*AL/0.414 where Cd is the orifice discharge coefficient. At step 1b, the critical head for the bottom orifice, where orifice flow turns into weir flow, is found by equating the result of the orifice equation to that of the weir equation Cd*Area*sqrt(2g)*sqrt(Hcrit) = Cw*Length*sqrt(Hcrit)*Hcrit or Hcrit = (Cd * Area) / (Cw/sqrt(2g) * Length) The value of Cw/sqrt(2g) for a sharp crested weir is 0.414.
Read more

SWMM 5 Error Messages

Engine Error Number Description ERROR 101: memory allocation error.                                                                                             ERROR 103: cannot solve KW equations for Link                                                                                   ERROR 105: cannot open ODE solver.                                                                                              ERROR 107: cannot compute a valid time step.                                                                                     ERROR 108: ambiguous outlet ID name for Subcatchment                                                                            ERROR 109: invalid parameter values for Aquifer                                                                                  ERROR 110: ground elevation is below water table for Subcatchment                                                         
Read more

EMC Washoff in SWMM5

Image
There are four steps to using EMC concentrations in your network: 1. Define your pollutant by adding a pollutant using the Data=>Quality=>Pollutant command : 2. Define the Land Use by using the Data=>Land Uses command or the Land Use Editor: 3. Define Buildup to be None by clicking on the None Tab: 4. Define the EMC Washoff concentration by clicking on the Washoff Tab: This is where you would add a GW concentration More: http://www.swmm2000.com/
Read more