Analisa Perbandingan Biaya Konstruksi Drainase Pracetak Dan Drainase Turap Konvensional (Studi Kasus : Jalan Lingkar Selat Baru)

This study aims to analyze the cost comparison between precast drainage and con-ventional retaining wall drainage construction on the Selat Baru Ring Road using the Cost-Benefit Analysis (CBA) method. It also seeks to identify the cost differences between the two drainage construction methods, where the total cost of precast drainage amounts to Rp 6.967.781.797, while the conventional retaining wall drainage costs Rp 1.918.845.451. The results of the analysis show that although the initial cost of precast drainage is approximate-ly 5.5 times higher than the conventional method—mainly due to the geographic condition of Bengkalis as an island area—precast drainage offers twice the service life and lower maintenance costs. In the long term, precast drainage proves to be more economical and provides benefits up to seven times greater than the conventional method. The Benefit-Cost Ratio (BCR) of precast drainage is 0,1034, significantly higher than the BCR of conventional drainage at 0,0202, indicating better long-term efficiency.