ANALYSIS OF WATER LOSS IN THE DISTRIBUTION NETWORK SYSTEM AND THE HANDLING STRATEGIES IN PERUMDA AIR MINUM TIRTA RAHARJA, CIMAHI CITY REGION

• Main Author: SHAFAAT, AMMARDITO
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/61269
• Institution: Institut Teknologi Bandung

Managing a drinking water service requires a great number of efficiencies in all of its processes from production to distribution. For Perumda Air Minum Tirta Raharja, one of the main factors that causes a lack of efficiency is water losses in the distribution network system. This results in the water produced from the WTP cannot be fully billed. Cipageran-Cimahi WTP is one of the most important water treatment units owned by Perumda Air Minum Tirta Raharja because it has the largest service coverage (Cimahi City) and produces the most water. In 2020, this WTP, which serves 13,778 Household Connection, has a fairly high water loss rate of 49.29%. The results of the water balance in this area shows that the value of Non-Revenue Water (NRW) reaches 54%, that of which consists of 42% of physical water loss, 3% of non-physical (commercial) water loss, and 9% of unbilled official consumption. This in turn causes a financial loss of Rp. 6,825,480,724 every year. The Infrastructure Leakage Index (ILI) value shows a value of 22.65 which indicates that the physical losses are more than 200 liter/connection/day. The network simulation using EPANET 2.0 show that there are still many junctions and pipes that do not meet the pressure and speed standards. The strategy for handling water loss at the Cipageran-Cimahi WTP is divided into technical and non-technical strategies. The technical handling strategies consists of the District Metered Area (DMA) approach, adding or replacing components, providing training to field officers on a regular basis, providing regular customer watermeter calibration; carrying out water theft detection activities on a regular basis; conducting periodic inspections of distribution lines, and checking watermeters that have exceeded their technical age. In addition, there are non-technical handling strategies which is carried out by planning a NRW reduction program based on the Plan, Do, Check, Action (PDCA) cycle. Based on the results of financial analysis using two scenarios, the proposed program is economically feasible with the value of NPV above 0, BCR above 1, and PBP of 11 years 5 months.