DESIGN OF DRAINAGE NETWORK, CLEAN WATER SUPPLY, RAINWATER TREATMENT SYSTEM, AND DEWATERING EXCAVATION AT 30 STORIES HIGH-RISE BUILDING IN SOUTH JAKARTA

• Main Author: PRANATA - NIM: 15014128 , ALBERT
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25300
• Institution: Institut Teknologi Bandung

<p align="justify">A mixed-use building is one solution to the lack of space in Jakarta. This building has functions that support each other so that the city community can have efficient activity, whether it minimizes costs, movement, and time. One of the planned mixed-use buildings is Graha Gatsu Building in South Jakarta's business center. Further civil design is required to realize this mixed-use building project. The design process of this civil building needs to be done in detail in order to achieve its function optimally. In this final project, discussed the design of water resources aspect in Graha Gatsu Building project located on Jl. Kapten Tendean No. 14A, South Jakarta. This building has 30 floors that functioned as office buildings and hotels. In addition to office and hotel functions, the building also has 2 basement floors and 1 semibasement floor which is planned as a parking lot. There are three main scope of work of the water resources aspect that is designed, namely drainage network design, water supply design and rain water treatment system, and dewatering excavation design. All civil designs on the aspect of water resources are initiated by hydrological analysis to obtain reliable discharge, flood discharge, and flood level based on rainfall data processing, topographic data, and hydroclimatological data. The reliable discharge from the hydrological analysis is then used to design the RWH (Rain Water Harvesting) tank. Meanwhile, flood discharge is used to design drainage, flood level, and dewatering pump design. In drainage network design, the designed and analyzed spaces are roof drainage, building yard drainage, urban drainage capacity analysis, and gate design. The drainage network design begins by drawing a drainage network layout taking into consideration the existing spatial aspects. Then, followed by the calculation of rain runoff by using rational methods. After rainfall and water catchment area is available, it can be done to dimensioning the components of the drainage network. Then, continued with the existing urban drainage analysis and design of the sluice gate. The water door used is automatic valve door made from fiberglass resin. In the design of water supply and SPAH, the scope that is designed and analyzed is the estimation of water demand, the determination of PDAM supply, the design of rain water catchment, the design of GWT (Ground Water Tank) and RWT (Roof Water Tank), and the design of pipes and water supply pumps . The design of clean water supply and SPAH begins with estimating the needs of clean water and rainwater supply. After the need for clean water and the supply of rain is obtained, the determination of water supply from the PDAM is made. The rainwater supply is only enough to meet 1.18% of Graha Gatsu's water needs. Although rainwater supply that can be used for water supply is small enough, Rain Water Harvesting (RWH) system from Graha Gatsu Building must still exist based on Article 3 of Indonesia’s Minister of Environmental Regulation No. 12 Year 2009. Then, layout of clean water supply is made by considering spatial aspect. After that, GWT, RWT, clean water pipes, and pumps are required to supply clean water dimensioning can be done. In the dewatering design of excavation, the scope that is designed and analyzed is the determination of the aquifer layer, radial flow analysis on a single deepwell, groundwater decrease analysis outside the D-Wall, determining the duration of the excavation dewatering work, the design of the recharge well, and the design of the dewatering pump excavation. Dewatering excavation method used is deepwell because deep depth of excavation. The dewatering design begins with geotechnical data processing to find the aquifer parameters followed by the determination of the aquifer layer. Thereafter, a radial flow analysis was conducted on a single well to determine the spacing and depth of the well and an analysis of the Ground Water Level (GWL) decline outside D-Wall to determine the impact of GWL decline at the site surrounding the project. Thereafter, the determination of the duration of the dewatering work takes into account the gravity of the structure itself and the uplift force. Then, the design of the recharging well is to recover the GWL outside the project. Thereafter, a dewatering excavation layout was constructed with deepwell components, observation wells, and recharge wells. After the layout is formed, it can be done the design of the pump used from dewatering excavation. Radial flow analysis, GWL decline, and groundwater filling in this case will be assisted by using SEEP/W software. <p align="justify"> <br />