Global climate change is a worldwide issue affecting rain and groundwater supplies. To realize the SDGs’ 6th goal regarding clean water and proper sanitation, Rainwater Harvesting (RWH) is one solution for pure water requirements and useless groundwater. RWH, which is equipped with infiltration wells, can overcome water scarcity during the dry season and reduce flooding in the rainy season. This research was conducted to harvest rainwater that falls on the roof into the reservoir to the ground, so it is necessary to calculate the rainwater availability and water demand to design RWH building plan. This research was conducted at the Faculty of Engineering, Pancasila University, which uses groundwater for essential water requirements. Two RWH reservoirs are planned in different locations, with the dimensions of the RWH reservoir are 4 m (length) x 3.5 m (width) x 3 m (height). Based on the flood discharge from the roof of 84 m3, the amount of water needed is 19.4 m3. For that, it is necessary to be equipped with 4 infiltration wells with a diameter of about 1.5 m and a height of 3 m to store groundwater around 6.402 m3. RWH application can also be applied to campus that use groundwater to reduce groundwater use.

Flooding is the most common disaster in Indonesia, it is classified as a disaster if it affects humans causing physical and financial losses. Flood damage depends on the type of flood, flow velocity, and duration. The increase in population will cause an increase in infrastructure that will affect the environment, including the carrying capacity of rivers and catchment areas, while flooding in urban areas will also have an impact on infrastructure and assets, increasing flood damage. This study discusses the factors that cause flooding (rainfall, topography, soil type, land slope, distance from rivers, river waste, population density, etc.), as well as various types of floods that occur. The method used in this research was based on the qualitative analysis of the information from the government and literature over the last five years obtained from online databases and search engines. The results of this study can provide a reference for the theory regarding disaster risk assessment and flood hazard prediction in watersheds. This research was conducted in the Ciliwung Watershed (DAS), where the factors and the dominant type of flooding were determined. Knowing the contributing factors can be beneficial for flood risk management. This research focuses on identifying factors that contribute to fluvial flood events and understanding their influence so that a more integrated flood risk management that takes into account the upstream, middle, and downstream parts of the watershed can be arranged in other areas based on the example of measures implemented by the local government in the Ciliwung watershed. This conceptual effort provides a much-needed foundation for developing better mitigation efforts in watersheds.

Using Water Balance to Analyse Water Availability for Irrigation with Upraising Surface Temperature ( Acase Study Pasar Baru Barrage in Cisadane Watershed)

Gempa bumi memiliki efek primer seperti kerusakan pada struktur bangunan, salah satu cara yang dapat dilakukan untuk memperkuat struktur bangunan dari gedung bertingkat dengan menambahkan pengaku pada struktur. Untuk mempertahankan mekanisme penahan lateral, sistem dinding geser maupun sambungan balok harus cukup kuat ketika beban terjadi. Dengan adanya beban yang bekerja maka akan terjadi tegangan dan regangan pada sebuah dinding geser. Dalam melakukan analisa tegangan-regangan dinding geser dilakukan dua model dinding geser yaitu free standing shear wall dan couple shear wall dengan menggunakan pemodelan finite element. Dalam pemodelan tersebut akan memasukan beban vertical dan beban lateral. Dari hasil pemodelan yang telah dilakukan diperoleh nilai tegangan dan regangan couple shear wall lebih besar dibandingkan free standing shear wall yaitu untuk tegangan 16680 kN/m2 dan untuk regangan 9,8x105. Sehingga dapat disimpulkan dari hubungan tegangan regangan bahwa couple shear wall lebih bersifat daktail dibandingkan dengan free standing shear wall.