Quality Inspector
Utility & Plumbing
Water Tank Calculator Nepal (2026) – Daily Requirement & Storage Master
Expert Guide
Professional water demand estimator for residential buildings in Nepal. 1 person ≈ 150 liters/day (standard assumption).
⚡ Quick Answer
For a family in Nepal, the Overhead (OH) tank is typically refilled daily using a pump, so it only needs 0.5 to 1.0 days of storage. The Underground tank should handle the full reserve (default 2 days) to ensure water security. For detailed plumbing layouts, visit pro.nirmansutra.com.
🛠️ How It Works
- •Enter the number of regular occupants in the household.
- •Select your garden type to account for irrigation needs.
- •Specify how many days of water reserve you want to maintain underground.
- •The tool suggests a range for the overhead tank and calculates the total underground volume.
📐 Calculation Formula
Daily Water = (Members × 150L) + Garden Usage
OH Tank = Daily Water × 0.75 (Range 0.5-1.0)
UG Tank = Daily Water × Storage Days
Note: OH tank is refilled using pump, so full storage not required at once.
⚠️ Common Mistakes to Avoid
- ✕Over-sizing the OH tank — large overhead tanks increase structural load on your roof. Since they are refilled daily, a 1-day capacity is usually enough.
- ✕Under-sizing the UG tank — the underground tank is your main buffer during municipal supply gaps or dry seasons.
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५ जनाको परिवारलाई कति लिटरको ट्याङ्की चाहिन्छ?
❓ Frequently Asked Questions
As per standard residential norms in Nepal, a person consumes approximately 135 to 150 liters of water per day for drinking, bathing, and cleaning.
The overhead tank is mainly for providing gravity pressure to taps and is refilled using a pump from the underground tank. Thus, it only needs to hold enough for a few hours to a day, reducing roof load.
Measure the length, width, and depth in meters. Multiply them (L × W × D) to get cubic meters (m³), then multiply by 1000 to get Liters.
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Worth NRs. 5,000
NRs. 999 🎯
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