Bendungan merupakan salah satu bangunan infrastruktur bidang sumber daya air yang penting dan memberikan manfaat bagi masyarakat setempat. Saat ini masyarakat sudah dihadapkan pada kenyataan bahwa ketersediaan sumber daya air sudah sangat kritis karena kondisi iklim yang fluktuatif antara debit hujan yang besar dan air yang semakin hari semakin menurun. Salah satu penanganan yang terbaik adalah dengan pendekatan struktural, yaitu membangun penampung–penampung air seperti bendungan.Penelitian dilkukan dengan cara survey lapangan dengan kegiatan wawancara dan observasi di lapangan. Analisa yang digunakan pada penelitian ini,yaitu analisa mengenai topik yang menyangkut tentang pekerjaan timbunan coverdam pada zona inti,zona filter,zona random,dan zona rip-rap proyek pembangunan bendungan jlantah jatiyoso. Dari perhitungan volume yang telah dilakukan dengan menggunakan metode potongan melintang rata-rata bahwa kebutuhan timbunan pada bangunan coverdam zona inti adalah 31.826,9970 m3 ,zona filter sebanyak 20.363,5303 m3 ,zona random sebanyak 546.874,987 m3, serta zona rip-rap sebanyak 34.384,15 m3.Pengujian kepadatan lapangan dengan menggunakan metode sandcone test dan water replcement test.Pengujiann permeabilitas dengan menggunakan metode falling head test.

Indonesia is a country that has quite high seismic activity and is prone to earthquake hazards, so the construction of embankment dams in Indonesia needs to pay attention to stability against collapse due to soil mass and earthquake loads. Jlantah dam is located in Karanganyar, Central Java. This dam is planned for irrigation needs of 1493 hectares and raw water of 150 liters/second. This study aims to determine the safety factor (Fs) on the Jlantah Dam body. The method used is a quantitative data analysis method, the calculation of the earthquake coefficient corrected by OBE and MDE, carried out with the help of a computer program, namely GeoStudio 2012. Meanwhile, if the earthquake coefficient is known not to be Fs 1.5. The method used is based on references from KP 02-Planning Criteria for Main Building Section and KP 06-Planning Criteria for Parameters Section, and Pd T-14-2004-A. The terms (Fs 1,2) which are used as the theoretical basis are quoted from the theory of Prof. Hoek (1981) stated that by knowing the earthquake coefficient, Fs 1.2 can be used, while if the earthquake coefficient is not known Fs 1.5 Analysis of Earthquake Backfill Type Dam Stability. From the results of the study, it was found that at the time of maximum water and the earthquake for the road dam body was declared from a good structural failure. The results of the bottom study on MDE earthquake conditions from the maximum water level obtained Fk > 1.0 Fk minimum, the maximum water level obtained Fk > 1, 2 Fk minimum with OBE earthquake conditions.

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