Increasing demand for water requires the improvement of water infrastructure. Dams are one of the most prominent infrastructures for water supply, especially as water demand increases. Due to its size, the dam is bound to affect the local environment, including the hydrometeorological and hydro/geological condition. The impact of dam on the local scale is supposedly dependent on several variables, namely, the height of the dam, its age, and the area of the river basin. This study studies the impact of dams on the surrounding environment by investigating 12 dams located in Java and are spread all throughout Java in particularly West Java, East Java, Central Java and lastly Jogjakarta. The dam environmental impact will be analyzed using: firstly, linear regression to determine the relationship between dams and environmental impact and secondly cluster analysis to divide the researched dams into categories. Dams in the study area could be divided into three clusters based on the similarity in height, age and river basin area. Additionally, this study finds that there is no correlation between the river basin area and both (ground) water quality and local climate. However, there was a correlation between the dam height with temperature and precipitation, as well as the dam age with Dissolved Oxygen (DO), Total Dissolved Solid (TDS) and pH. Regarding groundwater, the values of DO, TDS and pH are higher in dams located inside of groundwater basins compared to the opposite.
Rencana Anggaran Biaya merupakan (RAB) merupakan proses utama dalam perencanaan kegiatan pembangunan dan dasar untuk membuat perencanaan sistem pembiayaan serta kerangka jumlah perhitungan yang akan dikeluarkan. RAB diperlukan untuk mempertimbangkan suatu pembangunan atau proyek dengan banyaknya biaya untuk bahan, gaji pekerja, serta biaya yang berkaitan dengan pembangunan. Maka dibuatlah sistem informasi RAB berbasis android yang berguna untuk masyarakat luas sebagai referensi dalam menentukan buget dalam membuat rumah minimalis dengan type 21, 36 dan 45, dimana dengan sistem ini masyarakat dapat melihat perhitungan dimana saja dan kapan saja serta bisa merubah harga satuan yang diinginkan dan melihat total biaya yang diinginkan. Dalam penegembangan sistem aplikasi ini menggunakan metode RAD (Rapid Aplication development) karena dinilai cukup efisien, dan membangun aplikasi menggunakan software Android Studio dengan bahasa pemrograman Kotlin. Hasil dari sistem ini dapat memudahkan masyarakat dalam menentukan biaya membangun rumah minimalis, memberikan informasi perhitungan yang selektif dan akurat. Berdasarkan pengujian yang dilakukan oleh Ahli Materi dengan Hasil persentase 100%, Ahli Media dengan persentase 86,6% dan Angket Responden dengan persentase 90,6%, dapat disimpulkan bahwa aplikasi informasi perhitungan RAB rumah minimalis ini sangat layak untuk digunakan sebagai informasi pembangunan rumah minimalis.
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