<p>Internal erosion in earthen dams has consistently been a critical issue that compromises the integrity and safety of earthen dams. Enhancing the soil’s erosion resistance is crucial for mitigating the failure of earthen dams. The current study aims to mitigate internal erosion in earthen dams by utilizing polypropylene geotextile (PP-G) and jute geotextile (J-G). Laboratory studies using the hole erosion test (HET) apparatus have been conducted on three different soils with varying degree of expansiveness. The HET tests have been conducted at different hydraulic heads and different moisture contents of the soils. The performance of the jute and polypropylene geotextiles in mitigating the internal erosion of the extensive soils has been compared. The erosion rate was found to increase with the decrease in the degree of expansiveness. At optimum moisture content (OMC), the erosion rate of soil-1 was found to be 93.76% and 95.55% higher than soil-2 and soil-3, respectively. The inclusion of PP-G and J-G arrested the erosion rate for soil-1 by 97.14% and 96.87%, respectively, at OMC. Moreover, the ImageJ software was utilized to examine the shape of cavity formation inside the soil specimens. The image analysis results also revealed that soil-1 was more vulnerable to erosion. The inclusion of PP-G and J-G reduced the hole diameter for soil-1 by 48.57% and 40%, respectively. Further, the numerical simulations have been conducted on a hypothetical dam cross section to assess the practical feasibility. The provision of PP-G and J-G has reduced the vertical hydraulic gradients in the dam section below 1. Further, the factor of safety (FoS) of the downstream slope improved in the presence of PP-G and J-G layers. Both geotextiles show comparable results in the mitigation of soil erosion for earthen dams.</p>