Abstract
The decrease level of water quality of Brantas Watershed in Malang Raya was observed in this study. The aim of this study was to observe the decrease level of water quality of Brantas Watershed from Batu to Malang City. This study was carried out in the Brantas Watershed of Malang Raya (8 stations: A, B, C, D, E, F, G, and H) for 18,4 Km. The water quality parameters observed in this study were: CODmn (permanganometry), CODcr (CODmn correlation based analysis), dissolved oxygen (DO) (Winkler iodometry), TDS and electrical conductivity (EC) (EC meter), pH (pH meter), and turbidity (Turbidity meter). The result showed the value of CODmn: 1,8-10,2 mg/L, CODcr: 5,6-31,5 mg/L, DO: 4,0-6,1 mg/L, TDS: 204-289 mg/L, EC: 430-617 µS/cm, pH: 7,1-7,6, and turbidity: 2,02-10,30 NTU. There are 3 stations (A, B, and C) with 1st class water quality, 1 station (D) with the 2nd class water quality, and 4 stations (E, F, G, and H) with 3rd class water quality. The decrease of water quality in the Brantas Watershed from Batu to Malang City was up to 3 times with a decrease rate of 2,3 mg/L-1Km-1. The decomposition of organic materials in the water of Batu City and western part of Malang City is relatively better than that of central parts of Malang City which might be caused by the over capacity of recovery (Self-purification mechanism).
Highlights
The decrease level of water quality of Brantas Watershed in Malang Raya was observed in this study
The aim of this study was to observe the decrease level of water quality of Brantas Watershed
The water quality parameters observed in this study were
Summary
Sungai Brantas merupakan salah satu sungai terpanjang di Pulau Jawa. Berawal dari Desa. Brantas (Kota Batu), sungai ini mengalir ke beberapa wilayah di Jawa Timur (Malang, Blitar, Tulungagung, Kediri, Jombang, dan Mojokerto). Sungai Brantas memiliki peran yang penting untuk beberapa wilayah di area Propinsi Jawa Timur. Beberapa Kabupaten dan Kota di wilayah Propinsi Jawa Timur memanfaatkan aliran air dari Daerah Aliran Sungai (DAS) Brantas ini untuk berbagai kebutuhan. Kuantitas dan kualitas air yang mengalir di Sungai Brantas tentunya menjadi hal yang krusial untuk diperhatikan demi memenuhi seluruh kebutuhan ini. Indikasi yang tampak dari adanya penurunan kualitas air ini adalah tingginya tingkat kekeruhan air yang ada di beberapa lokasi DAS Brantas di Malang Raya (Bahriyah et al, 2018).
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