Municipal water supply system in most developing and under-developed countries remains old and inefficient due to lack of technical planning, improper management and fund constraint. With appropriate application of hydraulic modeling and GIS tools, this is an exciting area of opportunity for development. Greater Hyderabad Municipal Corporation (GHMC) was formed by the provincial government of Andhra Pradesh in India in 2007 bringing together 12 surrounding municipalities with Municipal Corporation of Hyderabad. The GHMC area has thus become 625 sq.km. with 80 lakhs plus urban population. GHMC administration, however, required up-gradation of age-old water supply system of 12 surrounding municipalities using 4 water supply sources from 4 directions to the Hyderabad City to meet water supply needs of the emerging urban demographic scenario.
A conceptual design of water supply system of 12 surrounding municipalities was prepared by following procedures: (i) inventory of existing water supplies (pipe size, age, material, working status, pipeline layout, capacity of service reservoir), (ii) survey data (L-section of pipe alignment, topographic-contours from existing maps), (iii) digitisation in AutoCad of pipeline layout and hydraulic zones for each service reservoir, (iv) GIS data crea-tion of inventory of existing water supplies as attribute information and survey data as Digital Elevation Model in ArcGIS, (v) define new hydraulic zoning based on topo-contour and physical barriers of railway line and roads which have come up in recent times,(vi) convert shape files in GIS to INP files in EPAnet-2 software (vii) provide input data of elevation, pipe length and water demand in each hydraulic zone with DMA arrangement in EPAnet, viii) evaluate output information of pipe size, velocity of flow and residual pressure.
In this process, 69 hydraulic zones are proposed with required DMA arrangement in each zone, 60000 node points (start and end points of individual pipes, crossing of roads as nodes, etc.) are created, between original and design distribution network, changes in pipeline are identified and additional 250 km. inlet pipes to service reservoirs are proposed. Doing such a massive exercise manually would have the possibility of human error in calculation and decision besides time consuming in delivery of the conceptual design to the client in time. Even though commercial software are available, Aarvee Associates as consultant to this project, chooses EPANET software integrating with GIS tools for efficient design of the proposed water supply system and demonstration of the system design to the client.