An earthquake of magnitude 6.4 Mw hit Lombok, Indonesia in July 2018, followed by another 6.9 Mw earthquake magnitude in less than a month in August 2018. The earthquake caused fatalities and damage to infrastructures, including the facilities of clean water. The main objective of this study is to know the impact of the earthquake towards clean water facilities damage, and to analyse clean water demand and supply after earthquakes in North Lombok Regency. Another purpose is to propose disaster mitigation to be implemented in the other disaster prone regions of Indonesia. The primary data were collected through field survey and questionnaire samples of 110 respondents. Secondary data regarding the damage of clean water network were collected from the Regional Water Company (PDAM) of North Lombok. The results of this study show that many clean water facilities were damaged due to earthquake. The amount of clean water demand in Lombok Island after the earthquake was decreased by 19.03%. The number of wells users after the earthquake increased from 22.73% to 57.27%. The potential groundwater for clean water in the Lombok Island is more than sufficient to fulfil the requirement of clean water during disaster. However, further studies are required to realize such idea.

The threat of drought that occurs every year will have an impact on hampering the activities of residents Dusun Sepi, Buwun Mas Village, Sekotong District. Therefore, it is necessary to make efforts to overcome the threat of a clean water crisis due to drought by conserving water or looking for alternative water sources. The application of a rainwater harvesting system (PAH) can be a solution to this problem. The purpose of this community service activity is to provide socialization and applications regarding efforts to anticipate drought disasters. The method used is a knowledge approach by providing socialization and application of the PAH system in one of the buildings at the Zainul Hafidz Islamic Boarding School At-Taufiq, Dusun Sepi, Buwun Mas Village, Sekotong District. The socialization activity took place on June 4, 2022 and went smoothly and orderly. During the implementation of the service activities, partners, in this case the residents of the Zainul Hafidz At-Taufiq Islamic Boarding School and the residents of the quiet hamlet, were very enthusiastic in participating in the socialization and application of rainwater harvesting (PAH) or roof-based rain water harvesting on a household scale with 54 participants. who came from the residents of the Islamic boarding school and residents around Dusun Sepi. From the estimated demand for clean water for Islamic boarding schools, with the PAH system as an alternative water source, the fulfillment of clean water needs for Islamic boarding schools can be helped by 3%.

Irigasi merupakan salah satu bentuk usaha dari pemanfaatan air dalam menunjang hasil pertanian. Usaha  penyaluran air diperlukan sebuah sistem jaringan yang memadai. Dalam memenuhi kebutuhan air tanaman untuk setiap sawah harus memperhatikan beberapa faktor diantaranya jenis tanaman, kondisi tanah, topografi, sosial, ekonomi, dan budaya masyarakat. penelitian ini dilakukan untuk mengetahui besarnya tingkat efisiensi jaringan irigasi pada jaringan irigasi Pekatan dalam mengalirkan air ke petak-petak sawah. Penelitian ini juga bermaksud untuk mengetahui factor-faktor yang mempengaruhi besarnya tingkat efisiensi pada jaringan irigasi Pekatan. Penelitian ini hanya menganalisis jaringan irigasi Pekatan Kiri. Metode yang digunakan dalam penelitian ini yaitu dengan melaksanakan pengukuran langsung dilapangan. Pengukuran dilakukan untuk mendapatkan data debit dari masing-masing ruas pada saluran primer, sekunder, dan tersier dengan menggunakan alat current meter. Hasil pengukuran debit kemudian dianalisis untuk mendapatkan besarnya tingkat efisiensi pada masing-masing ruas saluran. Hasil analisis menunjukkan tingkat efisiensi rata-rata pada saluran primer sebesar 85.436%, saluran sekunder sebesar 69.579% dan pada saluran tersier sebesar 69.863%. Sehingga tingkat efisiensi total pada jaringan irigasi Pekatan Kiri adalah sebesar 41.53%. Nilai ini masih berada di bawah standar yang ditentukan dalam Standar Kriteria Perencanaan, dimana efisiensi saluran irigasi sebesar 65%. Sehingga jaringan irigasi Pekatan Kiri tergolong kurang baik. Rendahnya tingkat efisiensi pada saluran irigasi Pekatan Kiri disebabkan oleh faktor usia dari saluran.

North Lombok Regency is located north of the below of Mount Rinjani where this area consists of five sub-districts, i.e., Pemenang, Tanjung, Gangga, Kayangan, and Bayan sub-districts, with a total population of 220,412 people. Despite being the youngest district, it has many problems, one of which is environmental problems, such as flooding and inundation. During the rainy season, inundation occurs in several locations in Tanjung District. Inundation happens because the existing drainage system is not functioning correctly. Based on the background mentioned before, a study was conducted to determine the condition of the existing channel, the factors causing inundation, and appropriate actions to overcome the problem of flooding and inundation in Tanjung District, North Lombok Regency. The method used in this research is to make observations and surveys in the field. From the analysis results, it is known that the problems of flooding and inundation in Tanjung District, North Lombok Regency are influenced by natural conditions and human activities. The solution or action that can be taken is to redesign and repair the damaged canal walls and clean the drainage channels from sediment and pile of trash.ABSTRAKKabupaten Lombok Utara berada di sebelah utara kaki Gunung Rinjani. Terdiri dari lima kecamatan yakni Kecamatan Pemenang, Tanjung, Gangga, Kayangan, dan Bayan dengan total jumlah penduduk 220.412 jiwa. Meskipun menjadi kabupaten termuda, banyak permasalahan yang dihadapi, salah satunya permasalahan lingkungan, seperti banjir dan genangan. Ketika musim penghujan terjadi genangan di beberapa lokasi di Kecamatan Tanjung. Hal ini disebabkan oleh sitem drainase yang ada tidak berfungsi dengan baik. Berdasarkan latar belakang di atas, dilakukan penelitian untuk mengetahui kondisi saluran eksisting, faktor penyebab terjadinya genangan dan upaya apa yang sesuai untuk menanggulangi permasalahan banjir dan genangan di Kecamatan Tanjung Kabupaten Lombok Utara. Metode yang digunakan dalam penelitian ini adalah dengan melakukan observasi dan survey di lapangan. Hasil dari analisi diketahui bahwa permasalahan banjir dan genangan di Kecamatan Tanjung Kabupaten Lombok Utara dipengaruhi oleh kondisi alam dan aktivitas manusia. Upaya yang dapat dilakukan saat ini adalah dengan melakukan redesain dan perbaikan pada dinding-dinding saluran yang mengalami kerusakan serta membersihkan saluran drainase dari tumpukan sedimentasi dan sampah.