AQUASAFE is being used to support de management and operation of water distribution networks being mainly focused in the following issues

  • Alerts

  • Reports

  • Leakage detection support

  • Energy optimization

By means of integration of advanced data analysis and operational modelling tools,AQUASAFE is helping the system operation to optimize the system interventions and to maintain an alert system, taking advantage of the forecasting capabilities, focused in the parameters the operation find most relevant. AQUASAFE as also the advantage of being able to connect to almost any data source or model being presently already able to work with Bentley and EPANet models

 

Alerts and Reports

AQUASAFE provides to the user an easy and comphreensive way to define alert conditions and produce automatic reports. Taking advantage of the capability of analysis of real time data and produce forecasts of the most probable system behaviour AQUASAFE represents a valuable operation tool to act preventively and to produce regular, fit to user needs, reports that may help the system manager to detect in time potential problems.

As an example in Itaquera system (SABESP) Scada signals denoting the water reservoirs levels are being analysed by means of a time series analysis tool, developed specifically for AQUASAFE platform. This tool allows the spectral analysis of the measured signal, identifying the most important time scales. This tool also allows detailed frequency analysis that may be used to define alert limits or simply to establish security bands, in order to determine whether measured values are normal or not. Sensor data is incorporated in the analysis as it is acquired. The frequency analysis may be performed for the whole time series, a time window centred on the analysed period, or a time window of a past period. For each time window, one may perform analysis of all data, by time of day (the latter being the most correct option, in case there is a clear daily pattern) or by week (to use when there is a clear weekly pattern).

Another example is the maintenance of a continuous verification of the correct pumps functioning. In this case, data acquired by the flow sensors placed at the exit of the pumping stations are compared in real-time with the theoretical pump curves, allowing the timely detection of eventual efficiency losses in the system or expected deviations. This is an analysis of great utility to management entities, because the verified real efficiency may often lead to conclusions that justify an equipment substitution.

Leakage Detection

The loss of water through leakages and unauthorized use is a serious financial burden to water companies. AQUASAFE's Leakage Tool focused on reducing this problem by leveraging existing information in order to detect and solve leakage problems as fast as possible. AQUASAFE´s Leakage Tool was developed for both online (fast) analysis and offline (detailed) analysis.

The Online Analysis of Aquasafe’s leakage tool is supported by the inputs of all available SCADA information about pressures, flows and levels. The performance of the Leakage Tool is influenced by the instrumentation of the pipeline, its location and data collection frequency.

The online Aquasafe´s Leakage Tool makes use of real time information and is always in operation. Aquasafe’s interface module provides a number of customizable options for managing and presenting to different users incoming measurements and emulating missing or faulty data. Configuration of the system and clear presentation of results is accomplished via the comprehensive graphical user interface.The following leak responses can be generated:

·         Unexpected flows.

·         Unexpected pressures.

·         Net volume unbalance.

The method is applied to leakage control areas. For each area the consumption is continuously tracked over the latest 24-hour period and compared with the figures representing similar situations from the past. The analysis period of the past tracking is configured by the user accordingly to his correct knowledge of the system. In case a leak is detected, an alarm will be submitted to the Aquasafe log and presented to the user. Setups can be adapted to night flows (or any periods with minimum consumption) to monitor changes in background leakage values.

The Offline AQUASAFE´s Leakage Tool, delivers a fully integrated version of Bentley’s award winning Darwin calibrator leakage detection tool within the Aquasafe’s operational environment. Bentley’s Darwin Calibrator enhanced leakage detection capabilities identifies the locations and sizes of the leakage holes, emulated as emitters that allow water to spurt and seep out at different rates depending on prevailing pressure. With the effective and rapid prediction of the most likely leakage locations, consulting engineers and water utility owners and operators save time and money by focusing their site investigations on the model-predicted leakage areas to test for leakage hotspots using widely available leak-detection instruments. Darwin Calibrator is quite demanding for field data as we might expect, Aquasafe’s is perfectly integrated with this tool allowing easy management of any number of field data sets retrieved from the SCADA system.

This leakage detection strategy fully integrated on the AQUASAFE platform follows and optimization-based approach for simultaneously quantifying and locating water losses via the process of hydraulic model calibration. The model calibration is formulated as a nonlinear optimization problem that is solved by using a genetic algorithm. The method is developed as an integrated framework of hydraulic simulation and optimization modeling.

Energy Optimization

Aiming to increase the energetic efficiency of systems, an application was developed within AQUASAFE tool, to optimise pumping cycles as a function of a detailed consumption pattern and pump functioning efficiency analysis, with the purpose of minimising energy consumption or costs. This application uses the potentialities of the Darwin Scheduler tool, integrated in the hydraulic model Bentley WaterGems. By this way it is possible to convert this sort of programs to a real-time tool that feeds on data from scada systems, producing optimisation scenarios to be transmitted to the operation centre.

With this perspective, an information flow and analysis scheme was implemented, with detailed analysis of consumption patterns in reservoirs (in terms of daily, weekly and seasonal variation), based on data acquired by sensors placed on the network, comparison between pump theoretical curves and their real functioning and the simulation of alternative exploration scenarios that may allow energy cost reduction, while maintaining the system’s performance level to consumers (see Figure 8).

Based on this analysis and the restriction of the minimum admissive levels for reservoirs, it is possible to perform alternative scenarios simulations for pump functioning, to ensure an optimised distribution of the pumping periods, profiting from the cheapest fare periods. An example of this is presented in the bellow Figures, showing that the reprogramming of pumping periods in itself makes it possible to reduce pumping during periods of more expensive fares and increase it in cheaper ones.

        

 

 


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