Flooding may occur due to dam failure at downstream of the spillway. Stilling basin of the spillway plays an important role in reducing turbulence generated by hydraulic jumps. It can avoid flooding and local scouring as well. Therefore, this study aims to analyze hydraulic jump characteristics experimentally. Two series of structures namely initial (S0) and final (S1) were tested. The S0 model is the United States Bureau of Reclamation (USBR) III type, while S1 is set the adverse slope of 1:2 at the downstream and lowering the bottom elevation of the channel by 4 m. Measurements were taken on the length of hydraulic jumps, water level and high speed before-after hydraulic jumps at various return periods discharges (Q) of 2, 5, 10, 25, 50, 100 and 1000 years. It is found that at S1, the jump is submerged, causing the relative hydraulic jump height (y2-y1)/y1 to be 40-90% higher than S0. Furthermore, the compression of more than 50% of the hydraulic jump length ratio (Lj/y2) was indicated at S1. In addition, the energy dissipation efficiency (εt) obtained for each discharge at S1 ranged from 58-84% (good absorption). On the other hand, at S0, the εt produced was around 70-89% (Q2-Q50) and 45% (Q100 and Q1000). It can be concluded that the modification of USBR III can reduce the vulnerability of the bottom and downstream parts of the stilling basin. It is expected that the potential flood disaster due to the stilling basin failure of the dam can be eliminated. These results may be used as recommendation to the disaster management strategies, such as improving dam safety guidelines, informing emergency response plans, or guiding infrastructure design to withstand hydraulic forces.

Ambon is a city situated inside a long bay in eastern part of Indonesia. The city has been stricken by a number of tsunamis in the past. The last tsunami event was generated by a submarine landslide inside the bay that hit two villages in the city in 1950. Despite the long story of tsunamis inside the Ambon city, no study has been conducted to estimate the impacts of future tsunamis on the growing coastal area of Ambon. This study was aimed at assessing the building vulnerability in Ambon due to projected impacts of future tsunamis. A numerical simulation was performed to generate tsunami inundation areas in the city using Cornell Multi Grid Coupled Tsunami Model (COMCOT) based on maximum fault area in the segment. A series of field works to classify the building types in the city were performed in May 2023 on around 70,000 units of buildings along the bay of Ambon. The classifications were done using Hazard United States (HAZUS) frameworks. Tsunami fragility curves were used to estimate the impacts of the tsunami based on flow depths obtained from the numerical simulations. Based on the surveys, this study found that buildings within 200 m from coastline of the bay could be in Damage State 4 (DS4) which is the most severe impacts of tsunamis on buildings.

Clean water as a primary need of human which is generally used for drinking, bathing, cooking and washing should be met in terms of quantity, quality, and affordability and sustainability. The government through the national development program of water and sanitation universal access which declared that by 2019, Indonesia will achieve the 100% target of proper clean water and sanitation for the whole Indonesian people. Water supply and Sanitation community-based Program (PAMSIMAS) is one of the prominent programs of the central government that adopt a community-based approach, where the main actors are the society as well as the person in charge to implement the project. PAMSIMAS II was launched in Aceh since January 2013 to April 2016 in which thre e districts joined PAMSIMAS are Aceh Besar, Pidie and Bireuen, with a total number of villages of the program as 46. The study conducted in the District of Aceh Besar with selected 15 (fifteen) villages as research object. This study aims to identify the level of success of PAMSIMAS II and identified community participation in managing water and sanitation infrastructure that has been built by the program. Those things were measured by the factors namely: 1. Adequacy, quality and continuity of water, also 2. Performance of BPSPAM as management body in village. This study adopt quantitative analysis that supported by qualitative analysis. Data were collected by observation, questionnaires and interviews. At the end the SWOT analysis is performed for the formulation of a strategic planning in or order to make PAMSIMAS sustainable in achieving access of clean water. The result of this research is information about th position of The PAMSIMAS II after the calculation of EFAS and IFAS which conducted based on the questionair that deliver to the actors of PAMSIMAS II in district of Aceh Besar and also recomendation about priority strategy should be conducted for the development of PAMSIMAS II in the future. Abstrak: Air Bersih sebagai kebutuhan utama dalam kehidupan manusia yang umumnya digunakan untuk minum, mandi, memasak dan mencuci sudah seharusnya terpenuhi secara kuantitas, kualitas, terjangkau dan kontinu. Pemerintah melalui program pembangunan nasional akses universal air minum dan sanitasi menetapkan bahwa pada tahun 2019, Indonesia dapat mencapai 100 % target layanan air minum dan sanitasi yang layak. Program Penyediaan Air Minum dan Sanitasi Berbasis Masyarakat (PAMSIMAS) merupakan salah satu program andalan pemerintah pusat yang menggunakan pendekatan berbasis masyarakat, dimana masyarakat sebagai pelaku utama dan sekaligus penanggungjawab pelaksanaan kegiatan. Program PAMSIMAS II dilaksanakan di Provinsi Aceh mulai tahun 2013 sampai dengan April 2016 di 3 kabupaten yaitu Kabupaten Aceh Besar, Kabupaten Pidie dan Kabupaten Bireuen, dengan total desa yang bergabung adalah 46 Desa. Penelitian ini dilaksanakan di 15 desa di Kabupaten Aceh Besar sebagai objek penelitian. Penelitian ini bertujuan untuk mengevaluasi keberhasilan Program PAMSIMAS II dan mengindentifikasi peran serta masyarakat dalam mengelola infrastruktur air bersih dan sanitasi yang telah dibangun. Hal tersebut diukur melalui beberapa faktor, diantaranya: 1. kecukupan, kualitas dan keberlanjutan air dan, 2. Kinerja dari badan pengelola di masyarakat. Penelitian ini menggunakan analisa kuantitatif yang didukung dengan analisa kualitatif. Metode pengumpulan data dengan melakukan observasi, kuesioner dan wawancara. Penelitian ini melakukan Analisa SWOT yang bertujuan untuk perumusan rencana strategis agar Program PAMSIMAS dapat berkesinambungan dalam pemenuhan akan air bersih. Hasil dari penelitian ini berupa identifikasi posisi Program PAMSIMAS II setelah dilakukan perhitungan EFAS dan IFAS yang dilakukan berdasarkan Kuesioner yang telah disebar kepada para pelaksana program PAMSIMAS II, dan kemudian dilanjutkan dengan rekomendasi prioritas strategi yang akan dilakukan untuk pengembangan Program PAMSIMAS II ke depan.

Krueng Aceh Irrigation Area in Aceh Besar District is expected to be able to improve the community economic growth and to support food self-sufficient in Aceh Besar District. To meet the expectation, It must be supported by the good and organized irrigation systems. So that Krueng Aceh Irrigation Network must have irrigation network system management which include of operational and maintenance activities (OP). This research aims to detect the existing condition of Krueng Aceh Irrigation Network in Blang Bintang Subsection, find out community role level in Water User Farmer Group (P3A) relating to existing irrigation network operational and maintenance activities, then formulating the system strategy operational and maintenance activities of Krueng Aceh Irrigation System. The method used to analyze the data in this research is descriptive and analysis SWOT. Based on the observation result, the irrigation network existing condition finding some damages in the canals, there are sediment and waste found in the canal, the livestock can be found both tied and not surrounding the irrigation network. According to the result of questionnaire distribution to the respondents, it can be concluded that the community and the water user farmer group (P3A) are not active in irrigation network operational and maintenance activities. The SWOT analysis results is obtained the strategies such as (1) improving the water management system operationally to do the efficiency of irrigation water utilization; (2) Improving the Human Resources quality by giving the socialization to the farmer community in improving the farmer production and implementation of irrigation network operation and maintenance activities; (3) Reactive the water user farmer group (P3A) in managing and maintaining the irrigation network; (4) Improving the role and responsibility of the P3A committee as well as community in maintaining the irrigation network; and (5) Improving the community awareness by growing the communal activity culture in maintaining the irrigation network both routine and periodic. Abstrak: Jaringan Irigasi Krueng Aceh di Aceh Besar diharapkan mampu meningkatkan pertumbuhan ekonomi masyarakat serta menunjang swasembada pangan di Kabupaten Aceh Besar. Untuk memenuhi harapan tersebut harus didukung oleh adanya sistem irigasi yang baik dan terorganisir. Untuk itu Jaringan Irigasi Krueng Aceh harus memiliki sistem pengelolaan jaringan irigasi meliputi kegiatan operasional dan pemeliharaan (OP). Tujuan dari penelitian ini adalah mengetahui kondisi eksisting Jaringan Irigasi Krueng Aceh di Wilayah Ranting Blang Bintang, mengetahui tingkat peran masyarakat Perkumpulan Petani Pemakai Air (P3A) berkenaan dengan operasional dan pemeliharaan jaringan irigasi yang ada. Dan merumuskan strategi sistem operasional dan pemeliharaan saluran irigasi Krueng Aceh. Metode pengumpulan data yaitu menggunakan data sekunder dan data primer. Data diolah secara statistik diskriptif dan analisis SWOT. Dari hasil observasi, kondisi eksisting terdapat kerusakan pada sebahagian saluran, banyak terdapat sedimen dan tumpukan sampah dan adanya hewan peliharaan yang diikat maupun dilepas di sekitar jaringan irigasi. Hasil penyebaran kuesioner kepada responden, dapat disimpulkan bahwa masyarakat dan perkumpulan petani pemakai air (P3A) tidak aktif dan melaksanakan operasional dan pemeliharaan jaringan irigasi. Hasil analisis SWOT diperoleh strategi-strategi yaitu (1) meningkatkan sistem pengaturan air irigasi secara operasional untuk melakukan efesiesi dalam penggunaan air irigasi; (2) meningkatkan kualitas SDM dengan memberikan sosialisasi, kepada masyarakat petani dalam meningkatkan produksi tani serta pelaksanaan operasional dan pemeliharaan jaringan irigasi; (3) mengaktifkan kembali perkumpulan petani pemakai air (P3A) dalam mengelola dan memelihara jaringan irigasi; (4) meningkatkan peran dan tanggung jawab pengurus (P3A) serta masyarakat dalam memeliharan jaringan irigasi; dan (5) meningkatkan kesadaran masyarakat dengan menumbuhkan budaya gotong royong dalam memeliharan jaringan irigasi baik secara rutin maupun berkala”

Baitussalam sub-district is one of the areas vulnerable to water in the district of Aceh Besar. During this time the District community Baitussalam it difficult to obtain a continuous flow of clean water. This is due to the remote location of the water source so as to obtain clean water, people need a lot of time and effort. Villagers District of Baitussalam were not served with clean water Regional Water Company (PDAM) Tirta Mountala, using ground water as clean water. Problems arise when the dry season, the ground water level has decreased, even loss of water discharge at all. This study aims to identify the dominant factors that may affect the distribution of water supply and analyze the strategy of water supply clean water prone villages in the subdistrict of Aceh Besar district Baitussalam. This research was conducted with questionnaires and interviews. Observations were made on the District community Baitussalam unserved water from PDAM Tirta Mountala. The results showed that the dominant factor affecting the distribution of clean water in District Baitussalam is an area that will be served by PDAM Tirta Mountala, and the allocation of increased funding water infrastructure. Strategy clean water supply in villages prone to water in the District Baitussalam is a set of service areas by PDAM Tirta Mountala towards building water treatment, then allocate increased funding water infrastructure, improve the discharge source of clean water related water needs in each village, and do development of Drinking Water Supply system (SPAM). Abstrak: Kecamatan Baitussalam merupakan salah satu kawasan rawan air bersih yang ada di Kabupaten Aceh Besar. Selama ini masyarakat Kecamatan Baitussalam mengalami kesulitan untuk mendapatkan air bersih yang kontinu mengalir. Hal ini disebabkan karena lokasi yang jauh dari sumber air sehingga untuk mendapatkan air bersih, masyarakat membutuhkan banyak waktu dan tenaga. Masyarakat desa Kecamatan Baitussalam yang tidak terlayani air bersih Perusahaan Daerah Air Minum (PDAM) Tirta Mountala, menggunakan air tanah sebagai air bersih. Permasalahan timbul saat musim kemarau, muka air tanah mengalami penurunan, bahkan kehilangan debit air sama sekali. Penelitian ini bertujuan untuk mengindentifikasi faktor dominan yang dapat mempengaruhi distribusi penyediaan air bersih dan menganalisis strategi penyediaan air bersih di desa rawan air bersih pada Kecamatan Baitussalam Kabupaten Aceh Besar. Penelitian ini dilakukan dengan penyebaran kuesioner dan wawancara. Pengamatan dilakukan pada masyarakat Kecamatan Baitussalam yang belum mendapatkan pelayanan air dari PDAM Tirta Mountala. Hasil penelitian menunjukkan bahwa faktor dominan yang mempengaruhi distribusi air bersih di Kecamatan Baitussalam adalah luas wilayah yang akan dilayani oleh PDAM Tirta Mountala, dan alokasi dana peningkatan prasarana air bersih. Strategi penyediaan air bersih di desa rawan air bersih pada Kecamatan Baitussalam adalah menetapkan wilayah pelayanan oleh PDAM Tirta Mountala terhadap bangunan pengolahan air bersih, kemudian mengalokasikan dana peningkatan prasarana air bersih, meningkatkan debit sumber air besih terkait kebutuhan air pada masing-masing desa, dan melakukan pengembangan Sistim Penyediaan Air Minum (SPAM).

Dam construction provides benefits to improve socio-economic status through the availability of food self-sufficiency, irrigation, conservation efforts, hydropower, flood control, and many other benefits to the community around the development. Before the construction process is carried out, a study is needed to present the flow behavior at side spillway of the dam to be safe against hydraulic failure, namely cavitation. The safety evaluation of this dam was carried out on the Krueng Kluet Dam located in South Aceh Regency, Aceh Province, using computational fluid dynamics. The method used in this study is a calculation of analysis from the results of numerical modeling at Krueng Kluet Dam with a discharge flow of Q1000. Cavitation analysis takes flow velocity and pressure data on the side spillway. Results show that crest of the spillway, side channels, and transition channels are safe from cavitation damage. In chute channel, cavitation damage occurs at distances of 450-465 m, 485-505 m, and 560-580 m. This cavitation arises due to a considerable negative static pressure value that can erode the channel surface slowly. A design to prevent cavitation is installing an aerator on chute channel or building a sill on transition channel at a distance of 430 m.