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Benchmarking water distribution with hydraulic simulations and analyses
The western Indian state of Rajasthan is known for its natural beauty and colourful history. However, 60% of the state’s land is desert – the main cause of its acute water supply deficiency. In the context of water distribution, benchmarking is an effective tool to identify critical components of the water distribution system where interventions are required. In order to benchmark the water supply and distribution system in Rajasthan, we conducted hydraulic modelling of the system in 222 towns. In so doing, we helped the state government in their objectives of equalising water pressure and enabling its equitable distribution.
Rajasthan – a land thirsting for waterRajasthan is India’s largest state, covering an area of 342,000 km2 with a population of 56.5 million people (Census 2001). The Aravalli mountain range runs from thesouth-west of Rajasthan to the north-east. This has divided the state into twodistinct geographical regions – the Thar Desert covering over 60% of the state’sland (which leaves Rajasthan acutely deficient in water supply) and the fertileeastern region. The distribution of Rajasthan’s urban centres is related to climaticconditions, water resources, and soil fertility. As such, the north-west region issparsely populated compared to the eastern region. Historically, Rajasthan hassome of the best planned cities and towns in India. However, rapid urban populationgrowth over the last four decades has resulted in considerable degradation of theseurban areas.
During the course of a study that we conducted in 222 Rajasthan towns, we observed that most of the junctions have inadequate pressure in the water distribution system. High head losses (excessive pressure drop – due to friction – as a fluid flows through a pipe) were noted due to the non-optimal design of the system in some areas. In others, water failed to reach consumers on account of low terminal pressure. As such, the water supply was intermittent and the efficiency of the system was compromised.
Hydraulic simulations helped optimise the water distribution network
Water networks consist of pipes, junctions, pumps, valves, service reservoirs and so on. Asset database and management is the key to analysing any water supply system. As part of the benchmarking process for the water supply and distribution system in Rajasthan, we conducted a detailed study in 222 towns in the state. Our study was classified into four stages – model building, model calibration, optimisation and reporting. In the process, we dealt with an enormous database comprising assets, topography of the area, supply quantity and duration.
With MIKE URBAN (now MIKE+), we were capable of managing and analysing this data efficiently. The state-of-the-art water modelling software provided a detailed solution for complete integration of GIS and water modelling for Rajasthan’s water distribution network.
We offered to provide solutions to optimise Rajasthan’s water distribution network with the help of our knowledge and experience in water modelling. The existing simulated network was approximately matched with the measured field pressures in the model calibration process. We used MIKE URBAN+ (now MIKE+) to map the low pressure junctions and critical pipes of the network (known as the ‘hot spots’). We then carried out detailed analyses of these variables with adequate hydraulic simulations.
We proposed that new pipelines be laid parallel to the critical pipelines. New pipelines will be less rough and optimised in diameter, thereby reducing head losses in the system. These proposed parallel pipelines will increase the flow in the system and eventually the terminal pressure in the system as well. As per our assessments, creating loops in the network will also increase the terminal pressure in the system, in some instances.
Overcoming challenges and helping to create a future roadmap
We faced a number of challenges when attempting to access the appropriate data for calibration. We were already dealing with a massive quantity of data and to add to it, there were several inconsistencies with the data obtained. It became necessary for us to track these irregularities to make sure that we were developing appropriate hydraulic models. We constantly checked the data for inconsistencies and suggested improvement measures. In the process, we completed nearly 3,000 models for the 222 towns in Rajasthan.
A planned benchmarking like this determines bottlenecks and critical assets in the system, thereby creating a roadmap for future investments. In the 222 towns that our study covered, the water supply is maintained by the Public Health Engineering Department of Rajasthan (PHED). The study provided an immediate solution to the challenges facing the demand-loaded water distribution network of Rajasthan. It also gave an estimate to the PHED about future improvement plans for water distribution networks. These could be applicable to other parts of Rajasthan as well as to other Indian states facing similar water distribution problems.
Optimised water distribution by generation of adequate terminal pressure
Potential for converting the intermittent water supply to a 24×7 supply
Increase in consumer satisfaction
End Client: Public Health Engineering Department (PHED), Government of RajasthanSub-consultant to: SMEC International Pty. Ltd.
MIKE URBAN+ (now MIKE+)
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