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All Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Teknik Sipil dan Perencanaan
Ritnawati
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Physics

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Impact of River Infrastructure on Sediment Distribution to Maintain Reservoir Lifespan: A Case of the Bili-Bili Reservoir, Jeneberang Basin, Indonesia Hasnawi, Mursyid Hasnawi; Ritnawati; Mahyuddin; La Ode Agisaqma; Muhammad Subri
Jurnal Teknik Sipil dan Perencanaan Vol. 27 No. 2 (2025): Jurnal Teknik Sipil dan Perencanaan
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v27i2.23178

Abstract

This study investigates the impact of river infrastructure on sediment distribution in the Bili-Bili Reservoir. Bathymetric data obtained using an echo-sounding sonar system were processed with Surfer 14 to analyze reservoir bottom morphology, storage capacity, and sediment accumulation. Hydrological modeling with NRECA calibration was combined with field measurements to estimate sediment inflow and storage loss. Results show cumulative sedimentation increased by 42% (1997–2005), 33% (2005–2011), and 25% (2011–2017), with a peak deposition of 21.74 × 10⁶ m³ in 2005. Following the construction of sabo dams, consolidation dams, and check dams in 2011, sedimentation rates decreased by 57% relative to 2005. Reservoir capacity declined from 365 × 10⁶ m³ in 1997 to 264 × 10⁶ m³ in 2017, reducing the effective service life by approximately 6.5 years. The remaining lifespan of the reservoir in 2017 was 24 years and 4 months, compared to the original design life. These findings emphasize that periodic dredging (every four years), monthly sediment removal at the consolidation dam, and sediment trapping in the Jeneberang watershed are essential to sustain reservoir performance.
A Study On Soil Bearing Capacity Strengthening Using Soil Cement On Jagebob Road With Unconfined Compression Test Erdawaty; Ritnawati; Fitriana, Tati; Adriati, Yolly; Tondok, Sapri Sampe
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.24848

Abstract

This study investigates the improvement of soil bearing capacity through the application of soil–cement stabilization on Jagebob Road using the Unconfined Compression Test (UCT). The research aims to evaluate how curing duration affects the compressive strength development of soil cement mixtures. Laboratory experiments were conducted on cohesive soil samples with curing periods of 0, 3, and 7 days to observe the changes in both physical and mechanical properties. The results show that at 0 days of curing, the compressive strength remained low (0.103–0.114 kg/cm²) due to incomplete hydration. After 3 days, a significant increase in strength was observed, reaching up to 0.295–0.305 kg/cm², indicating the beginning of cement hydration and improved particle bonding. At 7 days, the soil achieved even higher compressive strength as the hydration process produced more calcium silicate hydrate (C-S-H) and calcium hydroxide (Ca(OH)₂), which enhanced the density and bonding of the soil matrix. These findings confirm that the curing period plays a crucial role in strengthening soil cement. Therefore, a curing duration of at least seven days is recommended to achieve optimal mechanical performance and ensure improved bearing capacity of stabilized soils for road infrastructure such as Jagebob Road.
A Study On Soil Bearing Capacity Strengthening Using Soil Cement On Jagebob Road With Unconfined Compression Test Erdawaty; Ritnawati; Fitriana, Tati; Adriati, Yolly; Tondok, Sapri Sampe
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.24848

Abstract

This study investigates the improvement of soil bearing capacity through the application of soil–cement stabilization on Jagebob Road using the Unconfined Compression Test (UCT). The research aims to evaluate how curing duration affects the compressive strength development of soil cement mixtures. Laboratory experiments were conducted on cohesive soil samples with curing periods of 0, 3, and 7 days to observe the changes in both physical and mechanical properties. The results show that at 0 days of curing, the compressive strength remained low (0.103–0.114 kg/cm²) due to incomplete hydration. After 3 days, a significant increase in strength was observed, reaching up to 0.295–0.305 kg/cm², indicating the beginning of cement hydration and improved particle bonding. At 7 days, the soil achieved even higher compressive strength as the hydration process produced more calcium silicate hydrate (C-S-H) and calcium hydroxide (Ca(OH)₂), which enhanced the density and bonding of the soil matrix. These findings confirm that the curing period plays a crucial role in strengthening soil cement. Therefore, a curing duration of at least seven days is recommended to achieve optimal mechanical performance and ensure improved bearing capacity of stabilized soils for road infrastructure such as Jagebob Road.
Sustainable Design of Closed Drainage Infrastructure for Flood Control in Manggala Makassar City, Indonesia Ritnawati; Erdawaty; Adriati, Yolly; Indrayani, Poppy; Putra, Wudi Darul; Anshari, Muhammad Isya Arrumi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.24855

Abstract

Manggala District in eastern Makassar City experiences recurrent urban flooding driven by rapid land-use conversion, undulating topography, and drainage channels whose hydraulic capacity has been degraded by sedimentation and waste. Previous studies in Makassar have largely evaluated open eco-drainage measures, infiltration wells, and retention ponds, but few have provided a reproducible, discharge-based design of a fully closed circular conduit network sized against a defined return period. This study addresses that gap by coupling frequency-based hydrological analysis with hydraulic design of a closed circular drainage system for the Zone 1 catchment of Manggala. Annual maximum daily rainfall from the Makassar station (2014–2024) was fitted to candidate distributions and evaluated with goodness-of-fit tests; the 10-year design storm was propagated to peak discharge using the rational method with land-use-weighted runoff coefficients, and circular reinforced-concrete conduits were sized with the Manning equation. The catchment was delineated into two zones by topography and runoff concentration. Zone I (857.1 ha) requires a conveyance capacity of 0.63–1.57 m³/s and 1.86 km of closed channel, whereas Zone II (272.4 ha) requires 0.35–0.80 m³/s and 14.39 km. Circular conduits of 600–1200 mm diameter provide full-flow capacities of 0.43–2.76 m³/s at velocities of 1.5–2.4 m/s, satisfying the self-cleansing range while remaining below the scouring limit. Field observation confirmed that inundation develops when rainfall persists beyond one hour in low-lying, obstructed reaches. The main novelty of the study is a zone-specific, return-period-referenced closed circular drainage model in which conduits are placed beneath the road corridor, releasing surface land for urban functions while maintaining hydraulic efficiency and reducing sediment retention relative to the trapezoidal open channels currently in service.
Co-Authors Adriati, Yolly Anshari, Muhammad Isya Arrumi Erdawaty Fitriana, Tati Hasnawi, Mursyid Hasnawi La Ode Agisaqma Mahyuddin Muhammad Subri POPPY INDRAYANI, POPPY Putra, Wudi Darul Tondok, Sapri Sampe