SCADA: - abbreviated (supervisory monitoring and data acquisition) accountable to the monitoring and control system of monitoring and control. It is an application program used to control all activities of the waste water treatment plant, water treatment plant , electrical power plant and so on. The SCADA system includes two parts of the hardware (HARDWARE) & (SOFTWARE). The hardware equipment collects data from the various stations by linking it to the sensors on the equipment and sending it through the communication system to a control center that contains the computers that carry the software The latter, in turn, processes, represents and displays the data in the form of graphics so that the user can monitor it, as well as make decisions to insert units into the work or take it out as necessary<br /><br />In general, the SCADA system consists of four stages in a serial order from the different stations to the control center, which are: -<br />The data collection stage consists of (RTU & DAS) units, which are directly linked to the devices via sensors.<br />The communication unit between the collecting stations, the control centers, and the medium used to transmit the information<br />Control centers which contain computers and control programs<br /><br />Data Collection System (RTU & DAS): - 1. DAS: -It is abbreviated for (Data Acquisition System), which means the information gathering system, which is a booth that contains a set of connection points for the information of lines in the station and is connected to cables that contain a group of wires and thus these points are linked to the RTU. The plant’s information that is transferred to the RTU, let us concentrate on In case of electrical plant or power generation plant, then to the control center can be divided as follows: <br />a- Signals that specify the position of circuit breakers and separators in the station (Digital Data) in terms of the state of closing and opening and we take them from the relay and the protection signals for lines and transformers, for example, distance handling signals, self-closing handling, oil temperature sensors, ground handling, and others. <br />b- Readings of voltages, current, real power, and analogue data taken from power transformer measurements. <br />c- The (megawatt-hour) signals for knowing the quantity of production and consumption in (Accumulator Data) generating units and transformers are taken in the form of pulses from kilowatt-hour measurements and after these pulses are collectedin the RTU, it sends them very accurately at the end of every hour To the control centers. <br />d- Control signals for closing and opening of circuit breakers for lines, transformers, cobbler buses and the control signal. In raising and lowering the voltage level in the transformers for 400 kilovolt stations, where these signals are received via the information transmission device from the control center and connected to the information collection system booth for the purpose of linking it to secondary handling and files for closing and opening circuit breakers in the station.<br /><br />2- RTU: - abbreviated as (Remote Terminal Unit), which is an information transmission device that collects information from different units and sends it to control centers. (RTU) consists of a CPU information processing unit, a power source, a memory to store information while dealing with it, and input and output units for signals, whether digital Or connected (digital & analog) and connected to the logic controller (PLC) via RS232 or RS485 cable and also connected to a computer to display data via an optical cable as shown in figure 1<br /><br />The information collected in the Das cabin is linked to the information transmission device at the station (RTU) for the purpose of collecting it and transferring it to the computer in the control and control center through the available communication media between them, which are wired or wireless, and at different speeds ranging from (50 to more than 9600) (pulse / second). Information transmission devices are one of the main joints of the control centers, where without them the concept of efficient and optimal operation of the electrical system is not achieved, as the vast amount of data transferred to the control center leads to an improvement in the system’s efficiency in many areas that may be statistical or planning for the future and others. data collection presented in figure 2.<br /><br />B: SCADA IN WATER TREATMENT PLANT (WTP): The remote control system aims to manage a group of drinking water production stations, which are not short distances, through one control center. Operating from the reality of the measurements sent to the center. The main objective of the SCADA system is to: <br />1. Ensure that the company's water production plants are running without interruption, i.e. 24 hours a day. <br />2. Ensuring the quality and quality of drinking water produced in accordance with the Iraqi standard specifications as well as the World Health Organization, before pumping it into the network, and this is done through continuous monitoring and control over the 24 hours by the system. <br />3. Ensure that the permissible proportions of chlorine gas are present in the water before pumping it into the network (residual chlorine) as well as at the ends of the distribution network to ensure that no type of pollutants reach consumers through the network, as increasing or decreasing the level of chlorine is a high risk to health People and this percentage varies from time to time according to the raw water qualitative tests and the seasons of the year. <br />4. Ensure that the limits of permissible measurements for the percentages of acidity and alkalinity of water and the percentage of conductivity, turbidity and oxygen, all of which must be measured and controlled accurately in the proportion of water. <br />5. Reducing water losses during the purification process inside water stations or through distribution networks. <br />6. Measurement and control of the quantities of filtered water produced over a 24-hour period. Water production requires a measurement and control program that adapts to the different water consumption requirements over the course of 24 hours, and also varies throughout the year. Winter and these operations require the development of operating and measuring programs t Operating and stopping water pumps in line with the quantities of water measured or required to be pumped into the network. <br />7. Monitor pressures in water lines, especially in feeding networks, to reduce or prevent any explosions or leaks in these lines. 8. Calculating the unit cost of water, and this is done through the use of mathematical programs that link computers to the measurement and calibration processes of the added quantities of chemicals and the volume of raw water and pure water automatically through high measurement and control systems. Also the SCADA system monitors and controls the proportions of chlorine and alum quantities.<br /><br />C: SCADA IN WASTE WATER TREATMENT PLANT (WWTP):<br />Similar philosophy applied in the waste water treatment plant specially the control of oxygen diffused inside the waste water via the air blower pump for the purpose of maintain the bacteria to keep it able to reduce sludge in the aeration tank in addition to control the flow of lifting pump or screw pump plus the chlorine needed for the grey water.