Comparative Analysis of Time and Cost Performance in Construction Implementation Between Precast and Cast in Situ Methods in the Revitalization and Construction of Irrigation Channels for the Sumber Rejo Farmers Group, Tanjung Perengat Village, Berau Rege

Abstract

The development of irrigation infrastructure is a crucial factor in supporting the agricultural sector, particularly in regions that rely on water management systems to improve agricultural productivity. One of the main challenges in the implementation of irrigation projects is selecting the appropriate construction method to achieve efficiency in time and cost. In the revitalization and construction project of irrigation channels for the Sumber Rejo Farmers Group in Tanjung Perengat Village, Berau Regency, two commonly used methods are precast and cast in situ. This study aims to analyse the comparative performance of time and cost between Precast and Cast In Situ construction methods in the revitalization and construction of irrigation channels for the Sumber Rejo Farmers Group in Tanjung Perengat Village, Berau Regency. The study was conducted by analyzing the total cost and implementation duration of both methods based on work volume as well as labor and equipment productivity. The analysis results indicate that the Cast In Situ method is more economical, with a total implementation cost of IDR 1,568,880,000, while the Precast method requires a cost of IDR 2,043,560,000, resulting in a difference of IDR 474,680,000 or 23.23%. However, in terms of time performance, the Precast method demonstrates higher efficiency, with a construction duration of 136 days—25 days faster (15.53%) than the Cast In Situ method, which takes 161 days. Therefore, the selection of the implementation method highly depends on the project's priority. The Precast method is more suitable when time efficiency is the primary concern, while the Cast In Situ method is more appropriate when cost efficiency is the dominant consideration. This study is expected to serve as a reference for project implementers in determining the optimal execution strategy according to the needs and conditions of the project.