🚰
Nepal Building Code & Plumbing Tool
Underground Sump & Overhead Water Tank Calculator
Determine your household's daily water storage requirements, exact underground sump dimensions (Length, Width, Depth), 70/30 capacity split ratio, overhead roof tank size, and material quantities.
📖 Engineering Design Principles & Theory
According to Nepal National Building Code (NBC) and IS 1172 standards, residential water supply design relies on three critical factors: Per Capita Demand (135 Liters/person/day), Municipal Supply Intermittency (storing 2 to 7 days reserve), and Structural Load Limits on Roof Slabs.
*Count family members plus permanent tenants.
💡 What is Sump Split Ratio?
The Sump Split Ratio defines how your total calculated water reserve is distributed between the underground reservoir (sump) and the overhead roof tank. Storing 70% underground allows you to capture bulk water from intermittent municipal pipelines (like KUKL) or water tankers, while storing only 30% on the roof prevents heavy dead load stresses on top-floor beams and columns.