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Journal : Jurnal Karajata Engineering

Integrasi Model Hujan-Aliran Dan Sistem Informasi Geografis (Studi Kasus DAS Katingan Provinsi Kalimantan Tengah) Yusrianti, Destia Fitri; Nomeritae; Saputra, Raden Haryo
Jurnal Karajata Engineering Vol. 4 No. 2 (2024): 2024
Publisher : Fakultas Teknik Universitas Muhammadiyah Parepare

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31850/karajata.v4i2.3323

Abstract

The Katingan watershed in Central Kalimantan Province, Indonesia, has experienced land use changes that have led to a reduction in the groundwater recharge areas. This study aims to examine the hydrological response of the Katingan watershed due to land cover changes by simulating the discharge of the Katingan River in Kasongan using the Arc-SWAT model integrated with Geographic Information System or GIS. The calibration results showed that the dominant physical parameters influencing the model were CN2 and ALPHA_BF. The CN2 value increased from 80 in 2013 to 83 in 2022, indicating a decrease in recharge areas and an increase in surface runoff volume. Meanwhile, the ALPHA_BF value remained 1 for all calibration years, indicating no significant changes in groundwater volume. The best-performing model was found for the calibration and validation years 2022 and 2023, indicating that land cover changes had a significant impact on the hydrological response of the Katingan watershed
Simulasi Pemanenan Hujan dan Pengaruhnya terhadap Debit Drainase Primer di Jalan Pangeran Samudera, Palangka Raya I Made Kamiana; Adi Wicaksono; Nomeritae
Jurnal Karajata Engineering Vol. 4 No. 2 (2024): 2024
Publisher : Fakultas Teknik Universitas Muhammadiyah Parepare

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31850/karajata.v4i2.3381

Abstract

Flooding in the residential areas of Palangka Raya City has become more frequent, including in the neighborhoods around Jalan Pangeran Samudera. A viable approach for managing flood risks is the use of rooftop rainwater harvesting. The objective of this study is to model the effects of implementing a rooftop rainwater harvesting system in these residential areas on the flow of the main drainage system. The study was conducted in 2024 using a simulation approach. The data used includes maximum daily rainfall, the drainage network and its flow directions, as well as the roof areas of buildings around Jalan Pangeran Samudera. The Rational Method was employed to analyze the discharge both without and with the rainwater harvesting scenario. The research findings show that, for return periods of 2 to 20 years, the drainage discharge without the implementation of the rooftop rainwater harvesting scenario ranges from 4.414 m³/second to 7.396 m³/second. Meanwhile, with the implementation of the rooftop rainwater harvesting scenario, the drainage discharge is estimated to range from 1.847 m³/second to 3.095 m³/second. In other words, for return periods of 2 to 20 years, the implementation of the rooftop rainwater harvesting scenario is estimated to reduce the drainage discharge by between 2.566 m³/second and 4.300 m³/second. On average, the drainage discharge is expected to decrease by 58.15%.