3D modelling and visualization of drinking water supply system using 3D GIS

Since 2014, Universitas Gadjah Mada (UGM) has established Drinking Water Supply System (DWSS). DWSS established in UGM is in line with Indonesian Government's target to fulfil needs for 100% drinking water access in 2019. In order to improve the system's sustainability, planning and monitoring through mapping and 3D modeling of DWSS network distribution are needed. DWSS is expected to not only be well distributed but also to be easily monitored and accessed by student and staff in UGM. The purpose of this paper is to present the utilization of 3D GIS to map water dispenser location and to model the distribution of pipeline network. It also focuses to assess the appropriateness of the planned water supply for fulfilling the need of drinking water in each faculty. In addition to that, the map of water dispenser finder is also developed to support campus community in finding the nearest drinking water facility. Data acquisition of water location has been done by using Handheld GPS, while data processing and presentation of DWSS in 3D format are done by using AutoCad 2009, ArcGIS for Desktop 10.3.1 (ArcScene and ArcMap), while Sketch Up, ArcGIS Online, and CityEngine Web Viewer are used to model and visualize the 3D map. This project produces Geographic Information System of DWSS in UGM. The 3D GIS of DWSS encompasses the map of distribution of water dispensers, the 3D model of network distribution of drinking water supply, and analysis of planned water supply in order to assess the drinking water needs in each faculty. The map of distribution of water dispensers is a map depicting distributed water dispenser in UGM. 3D map of network distribution of DWSS is built by combining multiple datasets including UGM's Digital Terrain Model (DTM), 3D model of campus building, 3D model of pipeline network, 3D model of water dispensers and reservoirs. 3D network distribution modeling of DWSS is presented offline by using ArcScene 10.3.1 software and presented online by using CityEngine Web Viewer. From GIS analysis, it is found that the planned water supply has not answered the need of drinking water in each faculty. It can be seen that need of drinking water has reached 218.870 litres per day, whereas the planned supply is only 3.889,30 liters per day.