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Figure 1.3 Smart city architecture.

Figure 1.4 IoT with Smart-Aqua sensors via cloud.

A smart city mission is initiated in all nations for renewal of citizens’ lives through digital technologies. Also, the Government of India has aimed to develop at least 100 smart cities. Smart cities are equipped with innovative technologies such as 5G, Wireless Sensor Networks (WSN) and well-established Information Technology (IT) infrastructure. These technologies provide necessary services like water supply, transportation, recycling, and electricity in a smart manner, i.e., via connection of sensors, actuators and gateways to WSN. This connectivity helps to monitor, record and control the environment, which will help to satisfy the needs of the citizens. For instance, if a smart water monitoring system is considered, pollution level in water can be easily monitored through mobile phones (end devices) and IoT sensors (Smart Aqua Sensors) which are connected via the cloud as shown in Figure 1.4 [10]. Analysis of data on water monitoring can also be processed in order to display the results.

1.3 Literature Review on SWMS

      This section presents a literature review on SWMS. It is mainly divided into four subsections, namely Water Quality Parameters related to SWMS, SWMS in Agriculture, SWMS using Smart Grids, and Machine Learning (ML) Models in SWMS.

      1.3.1 Water Quality Parameters Related to SWMS

      When all other high-level services offered by smart cities are considered, SWMS gains the highest value. Research studies are particularly emerging in the drinking water management system for the welfare of the public and also in the field of agriculture. In [11], requirements for the smart water distributed system and water quality parameters such as technological, quality, quantity and topological parameters are discussed. A smart application is designed for the residents to get updates on water level and water quality using Raspberry Pi and MQTT protocol. Residents can use smart applications and can toggle the motors on and off accordingly. A turbidity sensor is used to determine the water purity.

      In other countries like Pakistan [12], an IoT-based water management is focused on rural areas and urban areas according to the requirements. In rural areas, due to lower population, automation of IoT is deployed in the irrigation sector, whereas in urban areas, monitoring of water quality in real time is deployed as such areas have high population levels. Water-quality is monitored using the controller module, where the data collected in the cloud is analyzed and the action is performed if the quality falls below threshold value. Ubidots and Thingspeak are the cloud platforms which are used for data storage in the cloud. In rural areas, as cellular connectivity is limited to 2G, implementation of cellular-based connection is impossible. Therefore, an IoT system which can provide sustainable operation is deployed. With this technique, water theft and water distribution policy violation can be eliminated. An actuator-based water distribution system is remotely controlled without any user intervention, which will avoid conflicts over water distribution.

      Multi-Intelligent Control System (MICS) can be designed in the IoT framework with the help of the entire monitoring process. It is made possible with the help of smart layers such as smart alerts, smart communication and smart water level. These layers assist in automation of the entire process involved in water management [13].

      1.3.2 SWMS in Agriculture

A district which constitutes farms, processing and supply companies is termed as an Agro industrial district. In agriculture sectors, quality irrigation is possible using SWAMP (Smart Water Agricultural Management Platform) architecture. Among SWAMP, FIWARE is the most preferred open-source platform. The main component of FIWARE is Orion Context Broker (OCB) which manages and responds to the system with the information collected from the surrounding IoT system as shown in Figure 1.5 [14].