HYDROGEOLOGY OF ARTIFICIAL RUNOFF REDUCTION WITH THE APPLICATION OF ZERO ARTIFICIAL RUN OFF (ZARO) IN THE METROPOLITAN AREA, BANDUNG RAYA (CASE STUDY OF FLOOD PHENOMENON IN THE CIKAPUNDUNG WATERSHED AND CITEPUS SUB WATERSHED)

• Main Author: Priyono, Imam
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67727
• Institution: Institut Teknologi Bandung

Understanding hydrogeological condition in the concept of spatial planning is essential. Hydrogeological conditions can be used as a reference in the development of areas. Hydrogeological analysis of groundwater basins will provide an understanding of the geometrical conditions of the aquifer below the surface. The condition and geometry of the aquifer system in the soil air basin are controlled by rock deposits' lithological, stratigraphic and structural factors. Knowing of these three things will provide an understanding of and distribution of the aquifer system to reconstruct hydrogeology in the Greater Bandung Metropolitan area. Based on the geometrical analysis of aquifers in the Greater Bandung Metropolitan area, it was found that multiple aquifer systems focus on the unconfined aquifer system composed of tuffaceous sandstone lithology at a depth of 10-40 m. Surface hydrological analysis was carried out by conducting a water balance study at the initial conditions (years 1940-1951) and current conditions (years 2008-2019). Results Based on the calculation of the air balance in the two time periods, it was found that the addition of runoff was 42.59%. The schematic concept of Zero Artificial Runoff (ZARo) is carried out with the concept of individual ZARo and communal ZARo. The ZARo concept was carried out in the Cikapundung watershed area and combining individual and communal ZARo concepts could reduce runoff by 22.38%. The ZARo concept was applied in the Citepus sub-watershed area and combining individual ZARo concepts could reduce artificial runoff by 39.32%. The ZARo concept is applied to urban areas in the ITB Campus, Gedung Sate, and the Mayor's Office. Based on the application of the ZARo concept in the three areas, it was found that the individual ZARo concept can accommodate artificial runoff during the 60 and 120-minute rain. Artificial runoff appears during the rain duration of 5 to 30 minutes but can be assisted by the concept of 30-40% infiltration wells. Based on the communal ZARo concept in the form of a 900 m3 wetland reservoir, it was found that the infiltration period of artificial runoff into the unconfined aquifer system ranged from 3.3 to 38.8 hours. The concept of zero artificial runoff is expected to solve flood control and anticipation in the Greater Bandung Metropolitan area so that flood-free Indonesia can be realized.