Real Time Control
Real Time Control (RTC) elements such as regulators, bendable weirs, and telemetry-controlled pumps are part of xpswmm. These hydraulic elements allow changes to model elements in real time (evaluated at every time step) based on defined depths of flow in any node in the model. Many control strategies can be evaluated in the program by using a combination of rating curves and these RTC elements. However, complex situations involving multiple sensors and Boolean logic are only possible by expanding xpswmm with our RTC add-on module. This powerful add-on module extends the existing depth-only RTC to a comprehensive management and design tool.
The RTC sensors can also include any combination of date/time, velocity, flow and water levels and depths at nodes, conduits, pumps, orifices, and weirs. The values of the sensors can be compared to static values and with each other using typical Boolean logic and mathematical operators. For example, a control can be activated if the water level in location A is greater than location B by 2.3 feet.
Numerous hydraulic parameters depend on the type of object being controlled. The parameters that can be modified include: flow, roughness, diameter, water depths, pump on/off levels, well volume and speed factor, weir crest and surface elevation, discharge coefficient and length, and orifice area coefficient.
Additional control properties include Start and Stop time of the control, ramp times and maximum and minimum values. Operators can be concatenated with Boolean operators, and parameters can be compared with other sensors or with absolute values. Real time control can be activated during certain hours of the day, odd/even days, days of the week, months of the year and control can turn on and/or off over a user-defined time period.