Abstract-Objectives to be achieved from the program science and technology for the Community (IbM) This is a crisis of groundwater that occur in the District Maradekaya, Makassar City can be resolved as well as long term targets is to encourage the local government of Makassar for the decision on the obligation for the people of Makassar making infiltration wells in his yard. The method will be used in these activities in the form of counseling for people in RW 03 and RW 04 about the dangers of groundwater in case of crisis, the way of making infiltration wells as well as manufacture in 5 homes in every RW (RW 03 and RW 04). The test results of water after infiltration wells through which rainwater is the quality of well water for the better. It is characterized by a decrease in turbidity of 27,5 %, NaCl 11,5 %, Sodium 12,3% and Chloride 11,1%.
Keywords-soil water conservation; recharge wellsAbstrak-Tujuan yang ingin di capai dari program Ipteks bagi Masyarakat (IbM) ini adalah krisis air tanah yang terjadi di Kelurahan Maradekaya Kota Makassar dapat teratasi serta target jangka panjangnya adalah dapat mendorong Pemda Kota Makassar untuk membuat Perda tentang kewajiban bagi masyarakat Makassar membuat sumur resapan di pekarangan rumahnya. Metode yang akan digunakan pada kegiatan ini berupa penyuluhan bagi masyarakat di RW 03 dan RW 04 tentang bahaya jika terjadi krisis air tanah, cara pembuatan sumur resapan serta pembuatan di 5 rumah warga di setiap RW (RW 03 dan RW 04). Hasil pengujian air setelah sumur resapan dilalui air hujan adalah kualitas air sumur menjadi lebih baik. Hal ini ditandai dengan penurunan kekeruhan sebesar 27,5 %, NaCl 11,5 %, Natrium 12,3 % serta Klorida 11,1 %.Kata Kunci-konservasi air tanah; sumur resapan
Excessive groundwater exploitation may lead to groundwater depletion, causing groundwater level at the inland lower than sea level and result in seawater intrusion (SWI) in a coastal aquifer. To control the occurrence of SWI, an alternative solution is to increase the replenishment of groundwater using a recharge reservoir. If a recharge reservoir is built in a region with soil hydraulic conductivity below 10-5 cm/s (semi impermeable), then a sand column is usually proposed, put on the bottom of the recharge basin and directly connected to the aquifer layer. The purpose of this study is to analyze the effectiveness of the sand column’s application in the recharge reservoir to control SWI. This research is an experimental study that combines physical and numerical modeling of the recharge basin with sand columns under a laboratory scale. The results of this research are beneficial for field applications because the process that occurs in the recharge reservoir can be determined prior to the real construction in the field. The results of the research are also useful to investigate whether the recharge reservoir is effective or not as a buffer of SWI in coastal aquifers. The expected result is that by using sand columns in the recharge basin, seawater intrusion can be controlled. It is hypothesized that the higher the number of sand column density and water level on the reservoir, the farther the freshwater saltwater interface is pushed toward the sea.
Soil is the most important component in agriculture. Soil degradation is caused by improper soil management, unpatterned planting, and homogeneous rainfall. Mapping of potential soil degradation was a process of identifying initial conditions to determine areas that have the potential in soil physical, chemical, and biological degradation. The purpose of this study was to create a map of Soil Degradation Potency (SDP). The research was conducted in Nguntoronadi district, Wonogiri. The mapping used a guided-qualification method and was assisted by ArcGIS application for overlaying the maps according to standard procedures, and the resulting value of soil degradation potency. The results showed the soil degradation potency was slightly in 454 hectares, moderate in 5,186 hectares, and high in 192 hectares. The research area was dominated by moderate to high degradation. Land management requires more attention according to soil conservation and sustainability. Further research is needed to determine the actual level of soil degradation to obtain recommendations for sustainable land management.
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