This document summarizes a study on evaluating the strength of reinforced concrete columns that have rainwater pipes concealed inside them. Three columns were tested: one with no pipe, one with a 50mm diameter CPVC pipe eccentrically placed, and one with a 50mm diameter HDPE pipe. Cube tests confirmed the designed M30 concrete mix achieved 34.24 MPa compressive strength. Column compression tests found that the column with the CPVC pipe achieved the highest load capacity (915 kN) before failure, followed by the solid column (670 kN) and then the column with the HDPE pipe (591 kN). The results show that concealing a CPVC pipe has less impact on a column's compress