An elevated storage reservoir (ESR) — the overhead water tank you see on RCC columns across Gujarat’s towns and villages — is one of the most important structures in any water-supply scheme. It stores treated water high above the ground so it can be distributed under gravity pressure, without continuous pumping. Here’s how an ESR is actually built.
What is an ESR?
An ESR is a water tank (the “container”) raised on a supporting structure called the staging. The height of the staging creates the pressure head that pushes water through the distribution network to homes and taps. ESRs are central to municipal (Nagarpalika) and rural (GWSSB) water schemes.
Step 1: Survey, design and capacity planning
Every ESR starts with the numbers: the population served, required storage capacity (in litres), and the staging height needed for adequate pressure. Soil investigation determines the foundation design. Capacities range widely — our own executed projects include a 22 lakh litre ESR at 20-metre height.
Step 2: Foundation
The foundation transfers the enormous weight of a full tank safely into the ground. Depending on soil conditions, this may be a raft, isolated footings or piles. Getting the foundation right is critical — the tank will hold lakhs of litres of water for decades.
Step 3: RCC staging
The staging is the set of RCC columns, braces and bracing rings that carry the container. It must resist not just the vertical load of stored water but also wind and seismic forces. Quality of concrete, reinforcement and curing at this stage directly determines the ESR’s lifespan.
Step 4: The container (tank)
The container is constructed on top of the staging, typically with a domed or conical top, a floor slab, and walls designed to be watertight. Access ladders, manholes and ventilation are provided.
Step 5: Piping
An ESR needs inlet (water in), outlet (water out to the network), overflow (safety), and washout (cleaning) connections. These are installed and integrated with the scheme’s pumps and pipeline.
Step 6: Water-tightness testing and finishing
Before handover, the tank is filled and tested for leaks. Any seepage is addressed, surfaces are finished, and the structure is commissioned into the water-supply network.
How long does it take?
Timelines depend on capacity, height, soil conditions and weather — but an ESR is a multi-stage RCC project where curing time cannot be rushed. Experience matters: shortcuts in foundation or staging quality are exactly where problems appear years later.
Build your ESR with experienced hands
D P Patel & Constructions is a Class “A” contractor with 30+ years in water works and 60+ ESRs built to GWSSB and Nagarpalika standards, with a 100% quality success rate. If you’re planning an overhead water tank anywhere in Gujarat, see our ESR construction service or contact us to discuss your requirement.