Underground Water Tank Construction — Hansa Co-operative Housing Society

Advanced Engineering & Construction constructed a 350,000-gallon underground water tank for Hansa Co-operative Housing Society in Karachi, under a contract valued at Rs. 42.78 million. This project sits within AEC’s civil infrastructure capability, applied at community scale for a housing society’s collective water supply rather than a single residential or institutional building.

Project Scope

An underground water tank at 350,000-gallon capacity requires structural design for sustained below-grade hydrostatic pressure, reinforced concrete detailing capable of holding that load without deflection, and waterproofing across every joint, wall penetration, and construction seam to prevent seepage in both directions — water escaping the tank and groundwater intruding into it. Construction of this kind typically proceeds through excavation and shoring, base slab and reinforcement, wall casting in controlled lifts to manage curing and joint integrity, roof slab casting, and a final waterproofing and pressure-testing phase before the tank is connected to the society’s distribution network.

At community scale, a tank of this size functions as shared infrastructure rather than a single-property asset, requiring AEC to coordinate excavation logistics, material delivery, and construction sequencing around an occupied residential society rather than a vacant or single-owner site.

Client Relationship & Delivery Model

As with AEC’s other private-sector projects, this contract was delivered directly for Hansa Co-operative Housing Society’s management committee rather than through a government procurement process. Community infrastructure projects of this kind typically require society-level approval and specification sign-off before construction, given the shared nature of the asset and its direct impact on residents’ water supply reliability.

Why This Project Matters

A 350,000-gallon underground tank at Rs. 42.78 million is AEC’s largest confirmed private-sector contract, exceeding even its Bahria Town residential build in value. This project demonstrates AEC’s civil infrastructure capability extends beyond building construction into specialized structures with strict waterproofing and structural load requirements, distinct from the general rehabilitation and renovation scope of AEC’s institutional contracts.

Credentials Behind This Project

AEC executed this project under its civil specialization codes held under PEC Licence No. 17347, Category C4/E, applying reinforced concrete and waterproofing detailing appropriate to a below-grade water-retaining structure — a scope that falls under AEC’s water-retaining structures specialization, CE04(iv).

Related Services

— Civil Contractors – Grey Structure
— Plumbing Contractors

Discuss a Similar Project

Frequently Asked Questions

What is the capacity of the tank AEC constructed?
AEC built a 350,000-gallon underground water tank for Hansa Co-operative Housing Society, Karachi.

What was the project value?
The contract was valued at Rs. 42.78 million, AEC’s largest confirmed private-sector project to date.

What specialization does this project fall under?
This project falls under AEC’s water-retaining structures specialization code, CE04(iv), part of its 26 PEC specialization codes.

Does AEC build infrastructure for housing societies, not just individual homes?
Yes. This project reflects AEC’s capability to deliver shared community infrastructure, alongside its individual residential and institutional building work.