Assessing the Remeneng River's Potential as a Sustainable Raw Water Source Using Water Balance and Pollution Index Approaches

Lalu Galeh Inggil Fatristya

doi:10.55927/dmkp6d58

Authors

Lalu Galeh Inggil Fatristya Magister Pengelolaan Sumberdaya Alam dan Lingkungan, Pascasarjana, Universitas Mataram Author

DOI:

https://doi.org/10.55927/dmkp6d58

Keywords:

Raw Water, Dependable Discharge, Pollution Index, Water Demand, Water Balance

Abstract

This study aims to analyze the availability and quality of the Remeneng River, evaluate its potential in supporting PDAM drinking water services in Labuapi District, and formulate management directions for long-term sustainability. Water availability was assessed using the F.J. Mock rainfall-runoff model calibrated against AWLR Keru discharge data (2010-2018), with dependable discharge (Q90) determined through Weibull probability analysis. Water demand was projected using the arithmetic population growth method for 2025-2035, while water quality was evaluated using the Pollution Index method based on Government Regulation No. 22 of 2021. The F.J. Mock model showed a very strong correlation with measured discharge (r = 0.809). The Q90 ranged from 0.009 m³/s in August to 1.144 m³/s in February, with critical deficits occurring from July to October (<12 L/s). Population is projected to increase from 84,959 (2025) to 106,768 (2035), driving raw water demand from 143.30 L/s to 180.08 L/s, while the existing intake capacity of 104 L/s is insufficient to meet future demand. Water quality remained generally good (PI: 0.534-1.513), although iron and color exceeded standards during the wet season due to runoff and erosion. The integrated quadrant matrix revealed that only three months (April-June) represent ideal conditions, while four months (July-October) face critical deficits despite good water quality

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