Arni Nurhawa, Bambang Setio Budianto, Aulia Choiri Windari

CHARACTERIZATION ANALYSIS FOR SEDIMENT MANAGEMENT IN GROGOL RIVER

Introduction

Characterization analysis for sediment management in grogol river. Characterization of Grogol River sediment (West Jakarta) reveals poorly graded Clayey Sand & high fines, accelerating siltation & flood risk. Data for effective sediment management.

Abstract

Abstract This study analyzed the grain size distribution and physical characteristics of the Grogol River bed sediment, Grogol Petamburan District, West Jakarta. This river plays an important role in the urban drainage system, but sediment accumulation causes siltation and a decrease in its capacity, thus increasing the risk of flooding during the rainy season. This study aims to provide technical data for sedimentation control. The method used is quantitative with laboratory tests, including grain size analysis (sieve analysis), specific gravity test, and water absorption. Sediment samples were taken from the river bed at certain points, then dried, sieved, and weighed. The analysis refers to SNI 03-1968-1990 and ASTM C-33. The results showed that 45% of the sediment material passed the No. 200 sieve (0.075 mm), classified as Clayey Sand (SC) according to the Unified Soil Classification System (USCS). The grain size distribution is classified as poorly graded, indicating an uneven and homogeneous size distribution, thus accelerating sedimentation. The fine fraction exceeds the ASTM limit which allows a maximum of 3% to pass the No. 200 sieve for fine aggregate. The bulk specific gravity value of 2.353 gr/cc, bulk SSD specific gravity of 2.415 gr/cc, apparent specific gravity of 2.510 gr/cc, and absorption of 2.7% indicate moderate porosity. These characteristics affect sediment stability and movement, especially when the flow rate changes. Overall, the Grogol River sediment has the potential to accelerate sedimentation, worsen siltation, and reduce the river's hydraulic capacity. These findings form the basis for planning mitigation strategies such as normalization, routine dredging, settling ponds, and adaptive drainage management according to local sediment characteristic

Review

The study "CHARACTERIZATION ANALYSIS FOR SEDIMENT MANAGEMENT IN GROGOL RIVER" presents a pertinent and timely investigation into the physical properties of bed sediment in the Grogol River, West Jakarta. Given the river's critical role in urban drainage and the escalating risk of flooding due to siltation, the objective of providing technical data for sedimentation control is highly relevant and addresses a significant urban environmental challenge. The authors employ a quantitative approach, utilizing standard laboratory tests such as grain size analysis, specific gravity, and water absorption, to characterize the sediment. This foundational work offers valuable insights into the geomorphological processes contributing to the river's reduced hydraulic capacity. A particular strength of this research lies in its rigorous adherence to established testing standards (SNI 03-1968-1990 and ASTM C-33), which enhances the reliability and comparability of the results. The findings are significant: classifying the sediment as Clayey Sand (SC) with a high percentage of fines (45% passing No. 200 sieve) and a poorly graded distribution clearly indicates a material prone to rapid accumulation and stabilization, exceeding standard aggregate limits. The specific gravity and absorption values further quantify the sediment's moderate porosity, providing crucial parameters for understanding its behavior under varying flow conditions. While the abstract effectively highlights these key characteristics, a brief mention of the specific *number* of sampling points or the *spatial representativeness* of the samples would further strengthen the methodological description, even if just to confirm that adequate coverage was achieved. The implications of this characterization analysis are substantial for urban river management. By clearly demonstrating the intrinsic properties of the Grogol River sediment that accelerate siltation and reduce hydraulic capacity, the study provides an essential evidence base for informed decision-making. The proposed mitigation strategies—normalization, routine dredging, settling ponds, and adaptive drainage management—are directly supported by the technical data presented. This research serves as a critical step toward developing effective and sustainable solutions for flood risk reduction in densely populated urban areas facing similar challenges. Therefore, this paper is a valuable contribution to the field of hydrological engineering and urban planning, and is recommended for publication.

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