Soak Pit Calculator Nepal
Estimate soak pit volume, capacity in litres, excavation, and budget for dig and lining. Planning only — site soil and setbacks matter.
How this works
circular: V = π r² h
rectangular: V = L × W × D
excavation ≈ V × (1+over%)Worked example
Circular 1.5 m diameter × 2.5 m deep → about 4.4 m³ (~4,400 L) pit volume before over-excavation.
Sources
- Distance from wells, buildings, and water table must meet local sanitation rules; clay soils may not soak adequately.
FAQ
How is a soak pit different from a septic tank?
A septic tank settles and partially treats sewage; a soak pit disperses liquid effluent into soil. Many houses need both in sequence.
What size soak pit do I need?
Size depends on daily wastewater, soil percolation, and local rules — not volume alone. Use this for rough capacity and dig budget, then confirm with a plumber or municipality.
Can clay soil take a soak pit?
Poorly draining soils may need larger areas, alternate disposal, or engineered systems. Test percolation before building.
How far from the house or well?
Keep setbacks from foundations, drinking wells, and property lines per local sanitation practice — often several metres minimum.
What is over-excavation %?
Extra dig for working space, gravel fill, or irregular sides. 10% is a simple planning allowance.