COST AND TIME ANALYSIS OF DRAINAGE WORKS USING CONVENTIONAL RIVERSTONE METHOD AND PRECAST U-DITCH METHOD

Road drainage is part of the infrastructure required for roads. This infrastructure is designed to drain water from the surface of the road to its final disposal. In general terms, drainage is a series of structures designed to reduce and remove excess water from an area or land to allow the land to function optimally. There are two types of road drainage systems, surface and subsurface. Surface drainage systems are generally open or closed channels. The method used in this research is quantitative method, where this method explains a process of seeking knowledge using data in the form of numbers as a means of analysing information about the things is desired to know about a situation that becomes the object of study and then analysed with the help of Microsoft Excel 2013 and Microsoft Word 2013 software. The comparative analysis results of the cost and time for implementation of drainage works using the conventional river stone method over a length of 192 metres requires 55 working days at a cost of Rp 123,617,000.0, while the precast U-ditch method over a length of 174 metres requires 48 working days at a cost of Rp 78,292,000.0. Where the implementation of the conventional method turns out to be 14% longer than using the precast method. The results of the analysis of the cost per metre of drainage works using the conventional river stone method and the precast u-ditch method obtained the results, which are drainage works using the conventional river stone method amounting to Rp 6,438,385 while the work using the precast u-ditch method is Rp 4,449,540, with the difference between the two methods amounting to Rp 1,988,845. Where the use of the precast method is 30% lower than the conventional method.