Gampong Leuhan is one of the areas in West Aceh district where most of the people still use ground water as a source of daily necessities. Some people have used artesian wells or drilled wells, but if we look at the cost of manufacture is very expensive. If more use of ground water from the drilling system, then will be inflict an impact of land subsidence. with these conditions, to overcome the problem of the need for clean water and lack of water for people's lives, it needs more effective and efficient system. One of proses is to make rainwater harvesting system from the rooftop of the building/housing by maximizing high rainfall.  Field survey  indicate building area in Gampong Leuhan already in good condition and livable with dominant house rooftop made of zinc, that this condition will be very maximum in rainwater harvesting process. The analysis of rain harvesting potential in Gampong Leuhan shows 887.892 liters/day, with average rainwater harvesting potential for each house is 862,031 liters/day. The ratio between the total amount of water harvested is 887.892 liters/day with the total use of water for the needs of the people of Gampong Leuhan amounted to 482.346,90 liters/day, indicates that with rainwater harvesting techniques will be sufficient and able to become one of the alternatives in the supply of clean water. Keywords: Clean water, Rainfall, Potential of rain water, Rainwater harvesting.

Gerusan tebing sungai merupakan salah satu permasalahan yang mengancam kestabilan tebing sungai, gerusan ini banyak menimbulkan kerugian yang berdampak terhadap keberlangsungan lahan yang ada disekitar sungai, tidak sedikit perkebunan dan perumahan warga yang tinggal di pinggir sungai. Desa Alue Buloh, merupakan salah satu desa yang terletak di pinggir sungai Krueng Ineung Daerah Aliran sungai (DAS) Krueng Seunagan merupakan salah satu desa yang berada di Kabupaten Nagan Raya yang terhubung dengan jembatan ke desa Latong, terjadinya gerusan dasar sungai dan gerusan lokal yang sudah sangat mengkhawatirkan. Gerusan tebing sungai merupakan hal yang sangat mengancam bagi lahan yang ada disepanjang sungai tersebut, jika dibiarkan gerusan tersebut dapat terus menerus mengikis lahan penduduk, Pengabdian ini dilakukan untuk memberikan ilmu pengetahuan kepada masyarakat metode yang relative mudah dan ramah lingkungan dalam usaha melindungi tebing sungai dari ancaman gerusan oleh aliran air sungai tersebut, pelatihan dikemas dengan kegiatan sosialisasi dimana dalam kegiatan ini masyarakat/mitra diberikan materi dan cara pembibitan serta penanaman langsung rumput vetiver yang menjadi tumbuhan yang akan membantu mengurangi dampak gerusan tersebut. Luaran yang dicapai dalam pengabdian ini adalah peningkatan kapasitas kelompok masyarakat dalam hal penanggulangan erosi tebing sungai secara vegetative dan melakukan pembibitan vetiver dan penanaman langsung pada pinggir sungai.

Rainwater harvesting is implemented appropriately by striving to use costs that are quite cheap and efficient, but still has many benefits for meeting clean water needs. In this study, the rainwater harvesting model to be analyzed was using the cistern method. The advantage is that it is easier to apply, the amount of water collected is quite large, and it does not require a large area of land. By implementing a culture of harvesting rainwater, can get several benefits, including reducing runoff which can prevent the UTU campus area from inundation and flooding. The average volume of rainwater that can be harvested using a 5-year return period is 110581.12 liter/day with an average volume of water requirements of 7452.09 liters/day. From the results of the rainwater harvesting analysis, it can be concluded that this method is capable of being applied where the analysis results show that the harvested rainwater can meet the water needs of users on the Teuku Umar University campus. In the future, it will be planning where the excess water stored in the cistern will be channeled into infiltration wells to maintain groundwater sources sustainably.

Local scour of bridge piers is the main reason for the failure of a hydraulic structure like abutment, bridge piers, etc. Local scours is a complex phenomenon that depends on the discharge, depth of flow, shapes of the pier and distribution of sediment particle. The problems of local scours occurred in Krueng Ineng river, Nagan Raya Regency will cause a structural collapse which has the impact of decreasing the stability of the bridge structure. In this study, the software of Hydrologic Engineering Center River Analysis System (HEC-RAS) 5.0.7 is used to evaluate local scour around the bridge pier which employs the Colorado State University method as a default equation. Flow conditions were simulated using HEC-RAS flow modeling software estimated for 100-year flood. The Results of the analysis with used the peak discharge (Qp100) that occurs in the Krueng Seunagan watershed is 1513m3/sec, pier width of Round Nose shape is 4m, and average grain size analysis D50 and D95 is 0.91mm and 4.35mm, show a maximum scour depth obtained is 5.04m. The results of this study will be a reference for the local government to planning appropriate handling for minimalizing local scours in the study area.

Desa Pasie Mesjid merupakan desa yang rawan akan genangan dan banjir ketika musim penghujan, dimana ketinggian banjir bisa mencapai 50-100 cm. Untuk meminimalisir terjadinya kondisi tersebut, maka pengabdian ini dilakkan bertujuan untuk meminimalisir limpasan air permukaan dengan memanfaatkan air hujan yang dipanen melalui atap bangunan. Manfaat lainnya adalah masyarakat memperoleh informasi bahwasanya penerapan pemanenan air hujan dapat menambah jumlah cadangan air tanah, memperoleh sumber air bersih dan dapat mengurangi limpasan permukaan yang dapat menyebabkan genangan dan banjir di kawasan perumahan. Meningkatnya pemahaman masyarakat secara teoritis tentang manfaat pemanenan air hujan melalui atap bangunan sebagai salah satu upaya dalam pemenuhan kebutuhan air bersih. Diharapkan pula nantinya tim mitra mampu menerapkan 1 (satu) sistem pemanenan air hujan untuk 1 (satu) rumah. Selanjutnya kelompok mitra dapat melanjutkan penerapan rainwater harvesting di setiap rumahnya masing-masing untuk memenuhi kebutuhan air domestik maupun non domestik dan dapat membantu pembuatan rainwater harvesting di rumah warga yang lain. Tim mitra dan tim pengabdi juga akan berkolaborasi dalam memberikan pemahaman tentang solusi dari pemanenan air hujan agar dapat diterapkan untuk desa-desa lainnya yang kasusnya sama seperti Desa Pasie Mesjid, Kabupaten Aceh Barat.