This is the end of the lecture series that concludes with a discussion on artificial recharge techniques and design, covering both direct and indirect technologies. Direct methods include surface and subsurface systems like flooding, percolation tanks, and recharge wells, while indirect methods focus on induced recharge and aquifer modification. Flooding or water spreading is the simplest, widely used method, especially suitable for flat topography, ensuring direct transfer of water into aquifers. Other methods, such as ditch and furrow systems or contour bunding, are tailored to specific topographies for efficient water percolation. Lastly, rainwater harvesting through percolation tanks or check dams plays a crucial role in managing surface runoff, enhancing groundwater recharge in fractured or weathered rock formations.