Konsumsi bahan plastik semakin hari semakin banyak sehingga akibat yang ditimbulkan semakin buruk. Karena barang berbahan plastik merupakan bahan polimer sintetis sehingga sulit terdegradasi di alam. Hasil observasi yang dilakukan mahasiswa kemudian dilanjutkan dengan rapat perencanaan program kerja yang akan ditawarkan untuk warga masyarakat dan karang taruna. Rapat tersebut menghasilkan keputusan bahwa program yang akan dilaksanakan salah satunya adalah pemanfaatn botol plastik bekas dan sampah plastik sebagai bahan konstruksi pembatas dusun dan tempat sampah. Pembuatan ecobrick memakan waktu yang cukup lama, oleh karena itu dapat dilakukan disela-sela waktu luang sehingga suatu saat bila sudah terkumpul dalam jumlah banyak bisa digunakan sekaligus. Apabila waktu yang tersedia cukup singkat isian botol dapat digantikan dengan pasir kering ataupun kerikil. Penggunaan botol dan sampah plastik sebagai batu bata ramah lingkungan tanpa disadari merupakan suatu langkah kecil yang lama kelamaan menimbulkan efek yang sangat besar bagi kelestarian lingkungan.

This study aims to analyze the water quality of Lake Perintis and Lake Limboto as irrigation water sources in Gorontalo Province. This study was carried out by considering the importance of water from these two lakes for irrigating the rice fields. 2 lakes became the locations for sampling in this study, namely Lake Limboto and Lake Perintis. Because this study was an initial survey, the researchers only applied one-site and one-time sampling for each lake. The observed parameters were temperature, TDS, COD, turbidity, phosphate, pH, nitrate, iron, manganese, cyanide, arsenic, fluoride, chlorine, manganese, magnesium, calcium, sodium, potassium, total coliform, and E. coli. The analysis was carried out at the Water Quality Laboratory, Health Office of Gorontalo and Integrated Research & Testing Laboratory of Gadjah Mada University. The sampling for total coliform was carried out aseptically, while measurements in the laboratory applied the MPN method. The way of taking chemical and physical samples followed SNI 8995-2021. Furthermore, the collected data were analyzed following Government Regulation No. 22/2021 Appendix VI regarding Lake Water Quality Standards. In analyzing water for irrigation purposes, the researchers applied the Sodium Adsorption Ratio (SAR) classification. Results showed that the water quality of Lake Perintis and Lake Limboto did not meet the requirements stipulated in Government Regulation No. 22/2021 because the chlorine, COD, and phosphate parameters were above the required quality standard. In addition, we also found that the pollution level in Lake Limboto was higher than that of Lake Perintis. Moreover, the results of the SAR analysis indicated a score of 7.975 for Lake Perintis (classified in the low sodium criteria) and a score of 11.23 for Lake Limboto (classified in the medium sodium criteria).

Generally, the synthetic unit hydrograph had to be developed just like a kind of Snyder that found accord empire scientific in the United States. Determination of their parameters has been presented by various criteria, but so far, the results are still relatively deviated for watershed-watersheds in Indonesia. The study was conducted to Bionga Kayubulan sub-watershed that has properties and characteristics that need to be conducted regarding irregularities by comparing models HSS Snyder with unit hydrograph observations on sub-watershed. Hydrograph water level readings AWLR derived from a flood hydrograph, using the are discharge. to separate the base flow with runoff straight-line method is used to produce direct runoff hydrograph. From the data obtained ARR hourly rainfall records were then analyzed, using the equation effective rainfall of index Φ. Direct runoff hydrograph and rainfall effectively revealed to be the observation unit hydrograph using collins method. Based on topographic maps obtained watershed physical factors were then used to analyze HSS Snyder. Further comparison of the HSS Snyder constant adjustments made using software Microsoft Excel-Solver. Observation unit hydrograph Bionga Kayubulan sub watershed has a peak time (Tp) of 4.5 hours with a peak discharge (Qp) of 2.81 m3/sec while Snyder HSS obtained from the analysis of Tp and Qp of 5.15 hours of 0.33 m3/sec. The test results showed that the predicted ratio Snyder HSS HSS calibration better than Snyder before calibration. CE adjusted value is 0.11 and as adjusted to 0.93. The value of EV adjusted is 65.20% before and after adjustment to 2.70%. EQP value addition, AETR values, and values after adjusting widened AETp 0 hours.