Definition
An Underground (UG) Sump is a large, heavily reinforced, and rigorously waterproofed concrete water tank buried below the basement or ground level of a building. Because municipal water supply in Indian cities often relies on intermittent gravity lines, the UG Sump acts as the primary collection basin. High-power booster pumps then constantly lift this stored water to the Overhead Tanks (OHT) on the terrace.
Practical Example
The municipal corporation only supplies water for 2 hours every morning. To ensure a 500-apartment society has 24/7 water, the contractor builds a massive 2-Lakh liter Underground Sump. During those 2 hours, the sump fills rapidly via gravity. For the rest of the day, electric pumps quietly draw from the sump to keep the terrace tanks full.
Application in Superwise
UG Sumps are critical path items. They require deep excavation and intense waterproofing. In Superwise, the QA team utilizes strict "Ponding Test" digital checklists. They fill the newly cast concrete sump with water and measure the water level drop over 7 days. If the sump leaks, Superwise flags the defect, preventing the earthwork team from backfilling dirt around the leaking tank.
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