What this tool does:
This calculator helps you find the required dimensions of a sump (underground water tank) based on how many liters of water you want to store. By entering only the capacity in liters and selecting the shape (Rectangular or Cylindrical), you will get an approximate tank size in feet.
The calculator converts the water storage requirement (liters) into cubic feet and then applies formulas for the chosen shape. Based on standard proportions (assumed ratios), it calculates approximate dimensions.
1 cubic foot = 28.3168 liters
For Rectangular Tank:
Volume (cubic ft) = Length × Width × Height
Assumed Proportion: L:W:H = 2:1:1
For Cylindrical Tank:
Volume (cubic ft) = π × r² × h
Assumed Proportion: Height ≈ Diameter
The formulas give an approximate size in feet (rounded to nearest whole number), which is practical for construction. You can adjust dimensions slightly depending on available space at your site.