Water Storage Masterclass
"Planning for a 3-day buffer in every Indian home."
Daily Needs / Person
Always keep your underground sump capacity 3X of your daily consumption to counter supply delays.
The Buffer Math
For a standard family of 5, the total daily requirement is 675 Liters. While a 1000L overhead Sintex tank is standard, your underground sump should be at least 2000L to 3000L to ensure continuity during pump failures or municipal cuts.
Rectangular
L × W × H × 28.31
Circular
π × r² × H × 1000
How to Calculate Water Tank Capacity
Whether you are casting an RCC underground sump for a new house or installing a PVC overhead tank (like Sintex or Plasto), knowing the exact volume is essential for water management. Most construction plans use feet or meters, while water consumption is measured in Liters.
Common Sump Sizes & Liters
| Dimensions (L × W × H) | Volume (CFT) | Liters (Approx) |
|---|---|---|
| 5' × 5' × 5' | 125 | 3,539L |
| 8' × 5' × 6' | 240 | 6,794L |
| 10' × 10' × 6' | 600 | 16,986L |
Maintenance Checklist
RCC Waterproofing
Always use Dr. Fixit or equivalent chemical waterproofing for sumps to prevent seepage.
Bottom Sludge
Clean tanks every 6 months to prevent Biofilm and heavy metal accumulation.
Frequently Asked Questions
How many liters is 1 Cubic Meter (CuM)?
Exactly 1000 Liters. In construction and plumbing, 1 CuM of water volume is always considered 1 kiloliter.
What is a good depth for an underground sump?
Ideally 5 to 7 feet. Over 8 feet depth makes cleaning difficult and requires higher pump head pressure. A wider and longer sump is always better than a very deep one.