The hilly and mountainous topography with high annual rainfall triggered a flash flood in the upper Lematang sub-watershed. The impact caused not only damaged infrastructure, agriculture land, and even fatalities. This research aimed to conduct flash flood hazard zoning based on morphometric parameters using the GIS technique. By extracting the DEM data, it is generated to a slope map, flow direction, flow accumulation, stream order, and watershed boundary. The data were then evaluated to obtain the morphometric parameters. Parameters analyzed using the PCA approach to get the correlation between parameters related to flash flood hazards. Of the 12 parameters, the KMO value is 0.66, and a significant level is 0.001 <0.05 with a sufficient level of intercorrelation. The result of PCA analysis, two factors were obtained with an eigenvalue > 1, and the cumulative percentage of the two factors was able to explain data variations of 87.49%. Finally, using 12 parameters, the upper Lematang sub-watershed area had 48.79% very-high hazard zones of a flash flood, 16.48% high zones, 20.28% moderate zones, and 0.97% low zones, and 13.48% very-low zones. The results of this study can be used in mitigation activities as well as for integrated watershed management.

The objective of this study was to determine the values of water and land productivity of floating pot cultivation in wetland and to find out the effectivity of floating pots usage for agriculture in wetlands. The planting media used were mineral soil added with 0% of soil having permeability 36.07 cm/hour, 30% 38.33 cm/hour, 50% 51.23 cm/hour, 70% 69.60 cm/hour and 100% was not having permeability value. The water delivery used was legacy cloth which had 158.4 cm/hour of hydraulic conductivity value. The floating pots were placed in the experimental tank at greenhouse. Water level decrease in the experimental tank was total evapotranspiration for all plants in five planting media treatments. Water level reduction during the 41-days planting period was 40.56 mm with 0.081 m 3 of total water volume. The productivity values of land and water in the 0%, 30%, 50%, 70% and 100% of peat treatments were 1.29, 1.25, 1.06, 0.8 and 0 kg/m 2 dan 1.63, 1.63, 1.38, 1.04 dan 0 kg/m 3 , respectively.

Currently, the water balance in the Air Betung Sub-watershed has decreased in quality/quantity due to the development of urban areas and increased economic activity, so that water allocation must be fair and equitable. The research objective is to optimize water resources to compliance domestic, industrial, and irrigation water needs. The analysis method uses the QM for Windows linear program application. From simulation and optimization were obtained, the availability of water was only able to supply irrigation water by 50.99% in 2019 and 61.22% in 2028. From the results of implementing five crop schedules and integrating plant types in each MT on irrigated land with limited water volume, the optimal profit is Rp. 17,606,110,000. Initial planting began on October 15 with the optimum area of MT-I (Paddy 1,211 ha -Palawija 0 ha), MT-II (Paddy 1,211 ha -Palawija 0 ha), and MT-III (Paddy 692 ha -Palawija 519 ha).Kata kunci: indeks kekritisan air, optimasi SDA, program linier, alokasi air. AbstrakSaat ini, keseimbangan air di Sub DAS Air Betung telah mengalami penurunan kualitas/ kuantitas sebagai dampak berkembangannya wilayah perkotaan dan meningkatnya kegiatan perekonomian sehingga pengalokasian air harus adil dan merata. Tujuan penelitian adalah mengoptimalkan SDA untuk memenuhi kebutuhan air domestik, industri, dan irigasi. Metode analisis menggunakan aplikasi program linier QM for Windows. Hasil simulasi dan optimasi diperoleh, ketersediaan air hanya mampu menyuplai air kelahan irigasi sebesar 50,99 % ditahun 2019 dan 61,22 % ditahun 2028. Dari hasil menerapkan lima jadwal tanaman dan memadukan jenis tanaman di masing-masing MT pada lahan irigasi dengan volume air terbatas diperoleh keuntungan optimal sebesar Rp. 17.606.110.000. Awal tanam dimulai 15 Oktober dengan luas optimum MT-I

Desa Penantian Kecamatan Jarai Kabupaten Lahat Provinsi Sumatera Selatan merupakan salah satu Desa yang memiliki potensi air yang banyak namun kualitas air yang kurang layak untuk dikonsumsi sehingga memberikan dampak yang kurang baik terhadap Kesehatan  masyarakat sekitar. Salah satu teknologi yang efisien untuk meninghkatkan mutu kehidupan masyarakat desa penantian adalah pembuatan struktur bangunan penjernihan air bersih secara sederhana. Tujuan kegiatan Pengabduan kepada Masyarakat ini untuk meningkatkan pengetahuan masyarakat dalam peningkatan mutu Kesehatan dan cara pembuatan struktur bangunan penjernihan air. Manfaat dari kegiatan ini adalah bagi masyarakat Desa Penantian dapat memahami tentang struktur bangunan penjernihan air dan meningkatnya pengetahuan masyarakat dalam mengetahui komposisi penjernihan air serta memanfaatkan sumber daya yang ada di sekitar Desa Penantian Kecamatan Jarai Kabupaten Lahat. Metode yang dipakai adalah memberikan sosialiasi dan pelatihan serta praktik secara langsung dengan masyarakat Desa Penantian dan tanya jawan maupun berdiskusi. Hasil yang dicapai dalam kegiatan Pengabdian Kepada Masyarakat ini adalah meningkatkan pengetahuan masyarakat mengenai peningkatan mutu kualitas Kesehatan dalam kehidupan sehari-hari.

Watershed Area is a land area that receives rain water to then flow it back through one main river to downstream. Watershed section upstream is often the focus of watershed management planning because in addition to its, as acatchment, there are alsonbiophsical links to downstream areas. This study aims to determine the level of erosion and sedimentation in  Air Betung sub-watershed. Erosion and sedimentation analysis used the formula USLE (Universal Soil Loss Equation) which was influenced by faktors such as, rain erosion index (R), soil erodibility index (K), slope length and slop (LS), management factor values safe and assement of land coversation factors (CP). Based on the result of the analysis with using the USLE method and approached with ILWIS 3.3 showed that value erosion  was  54,565.73 tons/ha/year. From the results of measurements in the large sediment field hovering that occured in Betung sub-watershed was 1.26 grams in 2L water with debit 5.25m3/sec