Choosing the right size of underground water tank is essential for ensuring your property has a reliable water supply while maximizing your available space. Whether you’re planning for rainwater harvesting, emergency storage, or daily household use, determining the correct tank size can save money, reduce water shortages, and increase property efficiency.
In this blog, we’ll walk you through the factors that influence the ideal underground water tank dimensions, helping you make an informed decision.
1. Assess Your Household’s Daily Water Consumption
The first and most important step is understanding how much water your household uses daily. Consider:
Number of residents in the home
Frequency of water-intensive activities (laundry, dishwashing, gardening, etc.)
Use of water-saving appliances
For example, an average person uses around 150-200 liters of water per day. A family of four could consume 600–800 liters daily. This basic calculation helps establish the size of underground water tank needed to meet daily demands.
2. Evaluate Rainwater Harvesting Potential
If you’re installing the tank to collect rainwater, consider your roof size and the average annual rainfall in your area. A larger catchment area and high rainfall can justify a larger size of underground water tank.
Use this formula to estimate collection potential:
Rainwater Collection (Liters) = Roof Area (sq.m) × Rainfall (mm) × 0.9
The result will help guide the underground water tank dimensions needed to store this volume effectively.
3. Factor in Available Installation Space
Space constraints are a practical consideration. Not all properties can accommodate large tanks underground. Review your site layout, noting any physical barriers such as foundations, trees, or utility lines.
Compact yet deeper underground water tank dimensions may be ideal in tight areas, whereas wide, shallow tanks might suit larger, open plots. Always consult a professional to ensure your selected size of underground water tank fits the available space without compromising safety or building codes.
4. Consider Usage Type and Water Supply Frequency
Will the tank be used solely for gardening, or will it support full household supply? Also, do you receive municipal water daily, weekly, or irregularly?
For irregular supply, a larger tank ensures adequate reserve.
For single-purpose use like irrigation, smaller underground water tank dimensions might suffice.
Knowing the purpose of the tank helps determine the optimal size of underground water tank that avoids both under- and over-capacity.
5. Think Long-Term: Future Needs and Upgrades
Your current water needs might grow. Planning for potential increases — such as a growing family or adding irrigation systems — is a smart move. Choosing scalable underground water tank dimensions ensures your system remains functional and relevant for years.
If unsure, slightly upsizing the tank is often better than realizing it’s too small after installation. However, never compromise structural safety or space limitations.
Conclusion
Selecting the right size of underground water tank involves more than a quick guess. By understanding your household’s consumption, available space, and the purpose of water storage, you can determine the best underground water tank dimensions for your property. Investing time in proper planning ensures long-term functionality, water security, and efficient space usage.
If you need help to clean you underground tank, our team of experienced professionals is ready to assist — making sure your underground water tank dimensions align perfectly with your needs.