SPATIAL DISTRIBUTION OF FLOOD INUNDATION IN PEKALONGAN CITY USING THE SOIL CONSERVATION SERVICE - CURVE NUMBER METHOD

• Main Author: Az Zahra, Talitha
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73544
• Institution: Institut Teknologi Bandung

Pekalongan City is one of the flood-prone areas which is always flooded every year. Flood can occur when the water in the reservoir has exceeded its capacity and overflows into the surrounding area because of a heavy rain, or even flood caused by land cover change. If this continues, the floods will continue to exist and even increase. Therefore, this research will apply hydrological model soil conservation service – curve number (SCS-CN) in order to map the distribution of flood inundation to address the flood problem. This method used land cover, soil type, precipitation, digital elevation model (DEM) data. This hydrological modeling has been done on the existing land cover (year of 2017) and the city’s masterplan (Rencana Tata Ruang Wilayah/RTRW) to examine RTRW’s effectivity to solve the flood problem. This model is also used to predict monthly flood potency based on each month corresponding precipitation data which will be used to compare how precipitation affects flood potency to how land cover change does. The modeling based on existing land cover of Pekalongan City (with area of 46,29 km2) brings about 13,97% of the area is potentially flooding, while the model based on their RTRW brings about 13,88% of the area will potentially flood. Both of those results show that the flood potency is spread out fairly in flat areas and mostly with a height of less than 11 m. Then, for monthly flood potency modeling show that the largest area which flooded happened on December, February, and January 2022 with area percentage of 18,89%, 13,41%, and 12,77%, while the smallest were on June, September, and November 2022 with area percentage of 0,13%, 0,95%, and 0,95% of Pekalongan City area.