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KAJIAN BENTUK DAN SENSITIVITAS RUMUS INDEKS PI, STORET, CCME UNTUK PENENTUAN STATUS MUTU PERAIRAN SUNGAI TROPIS DI INDONESIA (Assessment of the Forms and Sensitivity of the Index Formula PI, Storet, CCME for The Determination of Water Quality Status)

https://doi.org/10.22146/jml.18536

Sri Puji Saraswati(1*), Sunyoto Sunyoto(2), Bambang Agus Kironoto(3), Suwarno Hadisusanto(4)

(1) Teknik Sipil & Lingkungan, Fakultas Teknik, UGM , Jl Grafika no. 2, Yogyakarta 55281
(2) Teknik Sipil & Lingkungan, Fakultas Teknik, UGM , Jl Grafika no. 2, Yogyakarta 55281
(3) Teknik Sipil & Lingkungan, Fakultas Teknik, UGM , Jl Grafika no. 2, Yogyakarta 55281
(4) Fakultas Biologi, UGM, Jl. Teknika Selatan, Yogyakarta 55281
(*) Corresponding Author

Abstract


ABSTRAK

Metode-metode Pollution Index (USA), metode Storet (USA) dan metode CCME (Canada) adalah metode indeks kualitas air (IKA) untuk penentuan status mutu air. Dua yang pertama banyak digunakan praktisi lingkungan di Indonesia karena dirujuk dalam Keputusan Menteri  Lingkungan Hidup No. 115/2013. Ketiganya dapat menghitung IKA dengan baku mutu kualitas air lokal sungai kajian. Mengingat negara penyusun metode tersebut  berbeda kondisi lingkungannya dan masing-masing metode mempunyai faktor spesifik untuk menghitung IKA, maka perlu dikaji kesesuaian masing-masing metode untuk diterapkan di sungai tropis Indonesia. Masing-masing metode akan dikaji bentuk persamaan dan  sensitivitasnya dengan menggunakan banyak parameter kualitas air dan menggunakan jumlah parameter kualitas air tertentu mengacu pada metode IKA yang dikembangkan di negara tropis lainnya. Kajian menggunakan data pemantauan “Prokasih” di sungai Gadjah Wong Yogyakarta tahun 1996/1997 - 2011/2012. Penelitian ini dilakukan dalam rangka menyusun metode IKA sungai tropis Indonesia pada umumnya dan di sungai Gadjah Wong khususnya serta program pengelolaan kualitas air untuk pengendalian pencemaran air sungai, dengan target konservasi air sungai yang multifungsi atau overall/general use(memenuhi kriteria kesehatan  air baku, memenuhi kriteria estetika serta kriteria ekologi/aman bagi kehidupan di perairan). Hasil kajian menunjukkan bahwa dibandingkan 2 metode lainnya, metode CCME dinilai paling obyektif (secara statistik) menghitung IKA perairan sungai Gadjah Wong. CCME paling sensitif merespon dinamika indeks mutu air di setiap lokasi pemantauan,  lebih universal untuk dapat diaplikasikan di luar negara penyusunnya. Namun untuk diaplikasikan di sungai Gadjah Wong, metode CCME perlu diadaptasi terhadap beberapa hal yaitu jumlah dan jenis parameter kualitas air yang dianggap signifikan, jumlah dan kelas mutu air. Adaptasi mempertimbangkan program pengendalian pencemaran air dan strategi operasional/manajemen aliran sungai yang ekologis dan berkelanjutan. Skor batas dan makna setiap kelas mutu air dalam IKA harus diverifikasi terhadap data lingkungan lain misal hasil biotilik ataupun bioassay sehingga status indeks kualitas air tidak bertentangan dengan kondisi biologi di sungai. Pelibatan parameter bakteriologi kualitas air (Escherichia Coli dan Total Coliform) serta Electric Conductivity/EC sebagai parameter kualitas air signifikan dalam metode IKA masih perlu dikaji lebih lanjut  untuk pengembangan metode IKA khas perairan sungai di negara tropis Indonesia. 


ABSTRACT

Pollution Index method (USA), Storet method (USA)  and CCME (Canada) method  are  water quality index (WQI) methods used to determine water quality status of a river, the first two are widely used by environmental practioners in Indonesia since it is referred  by Environmental Ministry Regulation No. 115/2003.  These methods can be used based on local water quality standard. Considering that the country of WQI methods were developed have different environmental condition and each method has its own characteristics to calculate the index,  it is necessary to review a suitable WQI method for Indonesia tropical stream in general and for Gadjah Wong stream in particular. This research reviewed the form of the formula of each index, then analyze  the sensitivity of each index by  using many water quality parameters with and without bacteriology, and reducing the number of water quality parameters similar to those WQI index developed in other tropical countries. Indexes are reviewed using “Prokasih” (Clean River Program) monitoring data at Gadjah Wong stream from 1996/1997 to 2011/2012. Water quality statuses are reviewed in the contex of river water quality management for water pollution prevention, with the target of river water conservation which is “multifunction” or “overall/generall use” to meet health criteria for raw water, aesthetical criteria and ecological safety for aquatic life. Research conclusion showed that compared to the other 2 methods, CCME is considered as the most objective (statistically) to determine water quality index for river waters. It is also the most sensitive to respond to the dynamic of water quality index at each monitoring location (spatial & temporal). This method is also considered as more universally applicable outside of the country it was developed. To be applied at Gadjah Wong stream however, CCME index method needs to be adapted on the number and types of significant water quality parameters. The number of quality status classes of CCME index should be limited to simplify water quality management as well as ecological and sustainability of operational & management strategy. Score limit of  every class and significance of water quality classes need to be verified againts other environmental data such as results from biomonitoring and bioassay, the status results of the water quality index should not contradict with the stream biological condition. The use of bacteriology (Escherichia Coli and Total Coliform) and Electrical Conductivity/EC water quality parameters as criteria should be further reviewed for development of WQI method specific for Indonesia tropical stream


Keywords


indeks kualitas air sungai; status kualitas air; pengendalian pencemaran air; river water quality index; water quality status; water pollution control



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DOI: https://doi.org/10.22146/jml.18536

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