📖 Building Term

Sump (Underground Water Tank)

Definition

A sump in residential construction is an underground RCC water storage tank that stores water from the municipal supply or borewell, from which it is pumped to an overhead tank for distribution.

Explained Simply

Chennai's water supply is intermittent in many areas, making underground sumps essential. The sump stores large quantities of water when supply is available, ensuring continuous supply when water is unavailable. Sump capacity is typically sized for 1–3 days of household consumption per unit. Proper waterproofing of the sump is critical to prevent contamination and leakage.

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Why This Matters for Homeowners

An undersized or leaking sump causes water supply problems. Poor waterproofing allows soil contamination of stored water, creating health risks.

⚠ Common Mistake

Building a sump without proper waterproofing, using inadequate volume for the number of units, or not including a sump overflow outlet and proper ventilation.