In Vastu Shastra, water and its storage play a vital role in maintaining the balance of energies within a house. While an underground water tank placed in the northeast or north can bring prosperity, emotional stability, and positive energy, incorrect placement in the south, southwest, or southeast can lead to financial losses, health problems, and strained relationships. By following the correct directions and implementing Vastu remedies for misplacement, you can ensure the smooth flow of energy, promoting health, wealth, and happiness in your home.