DTK Hydronet Solutions, an advanced water distribution and storm and sewer network modeling company, was retained by the Public Health and Environmental Engineering Department (PHED) of West Bengal and the Asian Development Bank to provide water distribution services to Bankura. Bankura is an administrative unit within the state of West Bengal, and it is inhabited by many indigenous tribal communities. Currently, these tribes are facing acute drought challenges. Surface water sources are almost dry, and the groundwater is severely contaminated with arsenic and fluoride, making it non-potable. This project involved designing and constructing a water supply network that distributed water to a portion of Bankura that spans 600 villages and almost 1 million villagers.
Bankura’s existing water network consisted of asbestos cement pipes that had a long history of leaks and repairs. Therefore, DTK Hydronet created a separate hydraulic model to analyze the behavior of the existing network and determined that the antiquated network is incapable of catering to present and future water demands. Subsequently, they decided to discard the existing system in its entirety and design a new water distribution network using WaterGEMS. DTK Hydronet identified the most efficient routing option that would carry the water to the four designated blocks in Bankura. In the first stage of pumping, water is pumped from the source to ground-level reservoirs in every block. In the second stage of pumping, water will be pumped from these ground level reservoirs to their respective tanks in those blocks. While this option was not the most inexpensive, DTK Hydronet selected this solution because it was the most reliable given the large expanse of the project and area’s rolling terrain.
The design and engineering objectives achieved include: a single GIS-integrated hydraulic model; adherence to engineering standards for better safety; detailed analysis of every possible alternative; and savings of 40 percent in design costs and 80 percent in design time. In addition, cost-effective operations and future provisions for SCADA connectivity were additional benefits of the project. The entire distribution network was designed for minimum cost and maximum pressure benefits. The transmission main was analyzed for safety, and the pumps were designed to operate optimally and profitably. Using Bentley technology saved 9 months in design time as the design was completed in one resource month. DTK had estimated that this project would initially cost INR 12 billion, but with cost optimization of pipe diameters, materials, and pumping machineries, they reduced the cost by almost 16 percent. Five percent of capital was saved on pumping machinery and 11 percent in capital was saved on pipes.
DTK Hydronet developed the hydraulic model in WaterGEMS. CONNECT Advisor inside WaterGEMS allowed for swift access to all the technical resources, and the Network Navigator feature helped to develop an error-free model. The project team divided the hydraulic model in multiple scenarios in WaterGEMS, including transmission main and distribution scenarios. Darwin Designer was used to obtain multiple optimum-cost-design solutions and provided the team with a tentative, telescopic hydraulic model of distribution networks. DTK Hydronet conducted a criticality analysis with WaterGEMS to generate reports for operators of isolation step tests and DMA operations. The rising main was then analyzed for different operational alternatives, and the project team exported the rising main model to HAMMER to check and analyze for transience and pipeline failures.