Shallow groundwater in urban areas today is no longer fully utilized directly for domestic human needs. Some of the factors that cause, among others, due to pollution of springs by household waste, too much groundwater production resulting in the reduced amount of ground water. Finally the water function as a solvent and the neutralizer of the pollutant decreases as the water becomes less clear. By utilizing coconut shells as activated carbon mixed with silica sand, zeolite, and manganesee in this research can reduce turbidity, TDS and ground water PH so that the water produced can meet clean water standards according to PERMENKES/RI No.416/IX/1990. The objective of this study was to find an effective mixture composition to purify water using 5 different mixing compositions and it can be concluded in this study that coconut shells used as activated carbon amount to 35% of total media composition. So the most optimal composition to produce water with good quality of 35% active carbon, 25% silica sand, manganese 20%, 20% zeolite. In this composition also, Mangan (Mn) and Iron (Fe) have decreased and meet the quality standard of raw water quality as required by PERMENKES quality standard of Class B water quality.

ABSTRAKAda dua hal yang di identifikasi sebagai problem yang perlu segera ditangani di Pimpinan Ranting Muhammadiyah Panti. Pertama, adanya tumpukan sampah organik yang berasal dari limbah rumah tangga. Kedua, limbah yang berasal dari kotoran sapi, yang berpotensi mencemari udara, air serta tanah. Tujuan kegiatan ini adalah agar masyarakat yang ada disekitar Pimpinan Ranting Muhammadiyah mampu mengaplikasian program pembuatan pupuk organik dan biogas untuk skala rumah tangga. Metode pelaksanaan kegiatan ini dilaksanakan dengan cara Menjalin komunikasi dan kerjasama dengan Majelis Pemberdayaan Masyarakat, mengidentifikasi jumlah timbulan sampah organik, mengidentifikasi jumlah kotoran hewan serta melaksanakan pelatihan pembuatan pupuk organik dengan metode Takakura. Mitra sasaran adalah Pimpinan Ranting Muhammadiyah (PRM) Panti, berada dibawah Pimpinan Cabang Muhammadiyah Panti serta Pimpinan Daerah Muhammadiyah (PDM) Kabupaten Jember. Dari kegiatan ini sekitar 60 persen anggota masyarakat yang tergabung dalam program ini sudah mahir membuat pupuk organik. Sedangkan sisanya 40 persen sudah mengaplikasikan tetapi masih perlu ditingkatkan keterampilannya, baik urutan proses maupun beberapa kesalahan kecil. Dalam proses pembuatan biogas diketahui bahwa 45 persen masyarakat yang tergabung dalam program ini sudah mahir mengaplikasikan teknologi pembuatan biogas, selebihnya 55 persen harus mendapat pendampingan lebih lanjut dari Tim PKMS Universitas Muhammadiyah Jember dan MPM Kabupaten Jember.   Kata kunci: sampah organik; pupuk organik; biogas; kotoran hewan. ABSTRACTThere are two things that have been identified as problems that need to be addressed immediately at the Branch Leadership of Muhammadiyah Panti. First, there is a pile of organic waste that comes from household waste. Second, waste that comes from cow dung, which has the potential to pollute the air, water and soil. The purpose of this activity is so that the community around the Muhammadiyah Branch Leadership is able to apply the program for making organic fertilizers and biogas for household scale. The method of implementing this activity is carried out by establishing communication and cooperation with the Community Empowerment Council, identifying the amount of organic waste generated, identifying the amount of animal waste and carrying out training on making organic fertilizer using the Takakura method. The target partners are the Branch Leaders of Muhammadiyah (PRM) Panti, under the leadership of the Muhammadiyah Panti Branch and the Regional Leadership of Muhammadiyah (PDM) Jember Regency. From this activity, about 60 percent of community members who are members of this program are proficient in making organic fertilizers. While the remaining 40 percent have applied but still need to improve their skills, both in the sequence of processes and some minor mistakes. In the process of making biogas, it is known that 45 percent of the people who are members of this program are proficient in applying biogas production technology, the remaining 55 percent must receive further assistance from the PKMS Team of Muhammadiyah University of Jember and MPM of Jember Regency. Keywords: organic trash; organic fertilizer; biogas; animal waste

The upstream of the Barabai River is experiencing land conversion from forest to agricultural and mining areas. In 2021, f loods and river overflows will inundate nearly 75% of Barabasi City. The solution given is to build a Retention Pool so that the flow of the Barabai River before entering Barabai City is diverted to the Retention Pool. By conducting hydrological and hydraulic flow analysis with the application of HEC RAS with unsteady flow conditions, the water level profile along the Barabai River can be displayed including the flow behavior in the retention pond during flooding. As a result, the retention pond is only effective at accommodating 25% of the discharge during a flood. By optimizing using the HEC RAS program, alternatives to inundation or flooding in Barabai City are obtained, namely: widening the Barabai river 2x, expanding the regulation pool to 95 ha, building a second retention pond of 40 ha, and normalizing the Barabai River that enters Barabai City.

The purpose of this research is to find the equation of discharge coefficient (Cd) on a tyrol weir with diagonal circle filter sieve holes. To determine the discharge coefficient (Cd) a physical model test was conducted in laboratory by creating an open channel with a width of 40 cm and a length of 797 cm. Hole variations were made with diagonal formations with diameters of 6, 8, 10 and 12 mm, screen slope θ = 20°-45° and flowrate Q = 453-4 481 cm 3 •s -1 . The physical test showed that the water flow for the diagonal holes was about 140% more than for the screen with a straight formation of holes. The value of the discharge coefficient (Cd) constant is directly proportional to the froude number (Fr), the slope of the filter (θ), the ratio between the distance of the filter to the hole diameter (x/d) and inversely proportional to the specific energy (E). The value of the discharge coefficient constant is directly proportional to the Froude number, the slope of the filter, the ratio between the distance of the filter with the hole diameter and inversely proportional to the specific energy. After analysis, the results obtained that the value of the discharge coefficient constant (Cd) ranges between 0.15-2.75, then the accuracy of the model test obtained RMSE = 0.096, MAE = 0.074, NSE = 0.836.