The multiplying number of population in the City of Yogyakarta has resulted in a larger volume of wastes in the region. People living on the riverbanks are unfortunately in the habit of discarding domestic waste directly to the river channel, worsening the already polluted water. This study was intended to analyze the characteristics of the municipal wastewater contaminating Belik River. During the water quality test, a rapid investigation method and laboratory analysis were employed. The sampling in the field was based on river segments and travel time of river water. Based on the laboratory test results, the concentrations of phosphate, BOD, and COD in the water bodies had exceeded the standard for Class II water quality indicating pollution due to frequent disposal of household wastes like detergents. The higher the BOD and COD levels, the more unsuitable the water for fisheries and agricultural practices.

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The rapid development of Yogyakarta has made city development increase. This construction continues to expand the reach of impervious surfaces. As a result, the surface runoff and maximum discharge have increased, overflowing up to urban drainage. This study aimed to analyze the maximum discharge of the watershed based on design storms with 2, 5, 10, and 25-year return periods, used for flood control considerations. The urban flood was modelled using HEC-HMS. The results showed, the contribution of discharge flow in each segment is influenced by the dominance of land use, in which the segment dominated by dense settlements has a high contribution to the maximum discharge. The flow contribution is due to the high CN value which corresponds to the high surface runoff.

Kecamatan Muncar Kabupaten Banyuwangi ditetapkan sebagai kawasan Minapolitan diharapkan mampu meningkatkan kesejahteraan masyarakat baik di dalam kawasan maupun daerah sekitarnya. Masyarakat Desa Kedungrejo dan Tembokrejo mayoritas bekerja pada sektor perikanan, sehingga diasumsikan memiliki dampak langsung dari kebijakan minapolitan. Penelitian ini bertujuan untuk mengetahui perubahan kondisi sosial dan ekonomi masyarakat Kecamatan Muncar sebelum dan sesudah adanya program minapolitan serta mengetahui tingkat kesejahteraan masyarakat berdasarkan kondisi sosial ekonomi tersebut. Penelitian dilakukan pada 23 hingga 27 September 2018 dengan menggunakan metode kualitatif dari hasil wawancara terhadap beberapa pelaku industri, perangkat desa, kepala TPI, dan beberapa nelayan. Analisis dilakukan secara deskriptif kualitatif. Hasil penelitian menunjukkan bahwa kegiatan perindustrian dan sarana prasarana yang menunjang kegiatan perikanan sudah ada sejak tahun 1990-an. Aspek sumberdaya manusia dari segi pendidikan tidak mempengaruhi perkembangan tingkat produksi ikan, sehingga dengan ditetapkannya Kecamatan Muncar sebagai kawasan minapolitan tidak memberikan pengaruh secara signifikan baik kepada kondisi sosial-ekonomi maupun kesejahteraan masyarakat. Rekomendasi yang perlu diterapkan untuk pengembangan program minapolitan di Kecamatan Muncar dapat dilakukan melalui peningkatan sumberdaya manusia seperti penetapan sekolah yang berisi pembelajaran mengenai perikanan dan kelautan, serta peningkatan infrastruktur pendukung. Kedua aspek tersebut perlu ditunjang oleh aspek komitmen daerah sesuai dengan  Peraturan Menteri Kelautan dan Perikanan Nomor: PER.12/MEN/2010 tentang MinapolitanTitle: Analysis of Minapolitan Impact on the Community Welfare  in Muncar Subdistrict Banyuwangi Regency  (Case Study: Tembokrejo and Kedungrejo Villages)Muncar Subdistrict was designated as a Minapolitan area to improve the welfare of the  community both within and surrounding areas. It is assumed that Minapolitan policy gives a direct impact on the major livelihood of Kedungrejo and Tambakrejo people in fisheries sector. This study aims to measure the social and economic changes of Muncar community before and after the Minapolitan program as well as to measure the level of the community welfare based on these socio-economic conditions. The study was conducted on 23 to 27 September 2018 based on interviews with industry players, village officials, heads of fish markets and fishers. Data were analyzed using descriptive qualitative method. The results showed that fisheries industry and its facilities have been existed since 1990s. The education level of its community does not affect the fish production. It means that Minapolitan program has not given significant impact to the socio-economic condition and community welfare. It is recommended to improve the capacity of community through learning material at school concerning fisheries management and marine affairs as well as to increase the supporting infrastructure. These two aspects should be encouraged by regional commitment based on Regulation of Minister of Marine Affairs and No: PER.12/MEN/2010 regarding Minapolitan.

Sempor Reservoir is used for irrigation, domestic, industrial, and tourism purposes, as well as hydroelectric power plant and inland fish farming in pens. The land use in its catchment area is mainly plantation (74%) and, followed by, rice field (8.13%), dry farmland (7.74%), and settlement (5.69%). Agricultural activities, both in irrigated and rainfed farming systems, apply fertilizers to maintain crop quality, but when these substances washed away by surface runoff and transported through the drainage system, they end up increasing nutrients in water bodies. Excess nutrients like nitrate and phosphate induce a rapid growth of algae and aquatic plants, disrupting the ecosystems. This study was designed to identify the spatial distribution of nitrate and phosphate in Sempor Reservoir by field observation, water sampling, and laboratory analysis. The water was collected from 25 sampling points distributed at the outlet (close to the spillway), in the middle and the upstream of the reservoir, and around the fish pens (near the check dam). The results showed that nitrate was present on the reservoir water surface and at a depth of 1 meter at varying concentrations, i.e., <0.01-0.36 mg/L. The phosphate levels were <0.01-0.31 mg/L on the surface and <0.01-4.78 mg/L at a depth of 1 meter. The upstream had very high nitrate concentrations both on the surface and at a depth of 1 meter, while the outlet had very high content only at a depth of 1 meter. As for phosphate, very high concentrations were identified in the middle surface of the reservoir (near the pier) and at 1m depth around the fish pens.