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This study evaluates the retrofit design of the Semat weir on the Kali Gawe in Jepara Regency. The retrofit aims to adjust the weir’s hydraulic capacity to accommodate estimated flood discharges while ensuring the structure’s stability under applied loads. In the agricultural context, adequate water availability for irrigation directly affects crop yields; conversely, the rainy season often increases river flow and flood risk. Irrigation structures such as weirs are therefore required to raise river water levels to divert flow into irrigation channels and to regulate water distribution. Flood discharge estimates were derived from precipitation data and watershed (drainage basin) characteristics. Flood hydrograph planning is a critical design step for the weir. Log-Pearson Type III analysis was used to determine probable precipitation values for several recurrence intervals. Those design precipitation values were then converted into design flood discharges using synthetic unit hydrograph methods, specifically the Snyder, Nakayasu, and Gamma HSS approaches. Employing the Gamma synthetic unit hydrograph for the 50-year return period (Q50) produced a design flood discharge of 2,536.52 m³/s for that recurrence interval. Structural stability analyses of the redesigned weir indicate safety factors well above customary thresholds: overturning resistance factor = 11.6 (required ≥ 1.5), sliding resistance factor = 4.80 (required ≥ 2.0), and piping (internal erosion) factor = infinite (required ≥ 4). All evaluated stability parameters therefore satisfy standard safety criteria.

The Karanggeneng River in Rembang Regency, Central Java, serves as the main water source for the surrounding community but is vulnerable to seawater contamination during the dry season due to decreasing river elevation. To address this issue, this study aims to design and implement a river water elevation monitoring device based on the Internet of Things (IoT) powered by a hybrid Solar Power Plant (PLTS). The device utilizes the MB7360 ultrasonic sensor connected to an ESP32 microcontroller to measure water elevation in real-time and display the data through an LCD and the Blynk application on a smartphone. The methodology includes literature review, device design, system implementation, and field performance testing. Test results show that the sensor can measure water height accurately within a range of 30 cm to 5 meters, and the PLTS system is capable of supplying the required 0.56 Watts of power. The study compared two alternative solutions and selected the ESP32-based system as the best option due to its efficiency, cost-effectiveness, and easy-to-source components. The conclusion of this research indicates that the developed device can provide accurate and continuous information, support monitoring of river conditions to prevent the risk of seawater intrusion, flooding, or drought, and has the potential to be applied as a mobile system in various other river locations across Indonesia.

Compensation is an effort to reduce the pollution load from other sectors to replace the wastewater load that will be discharged by businesses and/or activities due to river water quality being exceeded. Currently, most large rivers in Indonesia have exceeded the water quality standards set by the government. The one of the hospitals in Jember plans to discharge wastewater into the Bedadung River. However, the Biochemical Oxygen Demand (BOD) quality standard for the Bedadung River has been exceeded. Therefore, alternative compensation activities are needed to reduce the BOD levels of the Bedadung River. Bathing, Washing, and Toilet (MCK) facilities with biofilter septic tanks were chosen. This technology is considered to be able to effectively reduce the BOD concentration of domestic waste before being discharged into the environment. This study aims to calculate the potential for reducing the BOD pollutant load in Bedadung River water if compensation is carried out through the construction of MCK with a biofilter septic tank system, so that it is expected to provide a significant contribution to improving river water quality while supporting the sustainability of hospital activities.

Water is a very important need for living creatures on earth. Humans, animals, plants and other living creatures need water, clean water is very much needed and is a source of life for living creatures. However, bacteria or germs that cannot be seen by the eye are still detected in the water. The bacteria that are mostly detected in water are; Escherichia coli bacteria. Escherichia coli forms colonies that are convex, smooth with distinct edges, and round. Method used The qualitative literature review research method is an approach used to collect, evaluate, and synthesize studies in the scientific literature that are relevant to a particular topic. Based on research results, Escherichia coli bacteria are found in various types of water such as refillable drinking water, well water and river water as well as swimming pool water

The Brantas River is a large river in East Java that has an important role for the community. Seasonal changes have an impact on the quality of the Brantas River in Indonesia. Testing is conducted by comparing samples taken twice a year, representing the dry and rainy seasons. The river's quality is analyzed based on several parameters such as Dissolved Oxygen (DO), BOD, COD, NO3-N, and Phosphate. The results are then compared with the standard river quality according to Government Regulation No. 22 of 2021. The analysis results indicate that the season has a significant impact on the river water quality, as seen from the different parameters in each season.  

Background: Modern agriculture often relies on the use of pesticides to control pests and plant diseases. However, the use of this pesticide can have a negative impact on the environment, especially on the quality of soil and river water in agricultural areas. This research aims to investigate the impact of pesticide use on soil and river water quality, with a focus on the type of pesticide used, usage patterns, and its impact on the environment and human health. Method: The journal research method with the literature review method is an approach used to collect, broadcast and synthesize information from various relevant literature sources Results: The use of pesticides in agriculture has a significant impact on the environment and human health. Appropriate methods of using pesticides, such as the correct dose and application time, as well as sustainable agricultural approaches such as organic farming, can reduce the negative impacts of pesticides. Farmer education about the safe use of pesticides is also important. In addition, soil and water quality must be considered in agriculture to maintain soil fertility and air ecosystems. River protection and rehabilitation efforts are also needed to maintain good river water quality.

Departing from the problem of disasters that often occur on river banks where when the rainfall is large enough, the river water discharge is also quite dangerous to the surrounding settlements. Therefore, we realized this greening program by planting tree seeds at a number of points around the riverbanks. With the goal of comprehensive river greening, an integrated, comprehensive, sustainable, and insightful plan is needed to think about the environment with the river as a management unit. This community service activity is carried out by the method of (1) community assistance in encouraging increased community participation (2) completion analysis problems and preparation of plans (3) Monitoring and evaluation of work program implementation activities.   The main target of this program is community groups and individuals who care highly about the environment with the aim of providing motivation for other communities. With the following stages of implementation: Consultation with the Village, Monitoring Planting Locations, Recruitment of seedlings at the Central Sulawesi Provincial Forestry Service, Planting on the banks of the hamlet 2 river, Planting on the banks of the hamlet 1 river, Planting in the yards of residents' houses, Planting at SD Negeri 2 Sindue   Tombusabora, Outreach on the dangers of throwing garbage into rivers and seas, Distributing plant seeds to residents. Greening is a means to overcome the environment so that the environment returns to health free from pollution.  

Mercury (Hg) is a metal that is commonly found in water and has toxic properties, so it is very dangerous for human health and the environment. Mercury in the environment can come from gold mining activities such as in Pesanggaran Village, Banyuwangi. Based on information from the surrounding community, the waste disposal flowed into the river and it was feared to affect the quality of river water in this area. This study aimed to analyze the mercury level in the river water using the UV-Visible Spectrophotometer method, where river water samples were taken from the upstream, middle, and downstream parts. Determination of mercury levels was carried out at the STIKES Banyuwangi Laboratory. The results showed that the Hg content in the river water around the gold mining area of Pesanggaran Village, Banyuwangi ranged from 0.031 to 0.033 mg/L. The Hg level of river water in this area was above the threshold and it was not recommended to use as drinking, bathing, cooking or washing. However, it is necessary to analyze Hg levels using other methods, such as the AAS (Atomic Absorption Spectroscopy) method which is more expensive but more accurate results will be obtained.