Government School Campus Protection Project – Installation of Ocean HDPE Liner 1200 Micron | Bhopal, Madhya Pradesh

Project overview

At a government school campus in Bhopal, Madhya Pradesh, Ocean Non Wovens supplied and installed Ocean HDPE Liner 1200 Micron over a total area of 2,500 square meters. The aim was to make the campus more durable, manage water better and protect the ground around the buildings.

The liner provides waterproofing and ground isolation. It keeps moisture away from foundations and protects against the erosion and standing water that Bhopal’s monsoon brings each year.

Why school campuses need ground waterproofing

Government school buildings across India face the same recurring problems:

• Subsurface seepage that damages foundations
• Ground softening during the monsoon, leading to settlement
• Soil erosion in playgrounds and open areas
• Waterlogging near drainage routes and toilet blocks

Bhopal adds its own conditions. Black cotton soils are common in the region, and most of the city’s annual rainfall arrives between June and September. Expansive clay that swells and shrinks with seasonal moisture puts repeated stress on foundations and drains, so waterproofing that keeps moisture changes away from the building saves repair money later.

HDPE geomembrane liners suit this work because they:

• Block water effectively: HDPE’s equivalent hydraulic conductivity is extremely low, typically quoted below 1 x 10⁻¹⁴ m/s
• Last a long time when buried and protected from sunlight
• Resist microbial attack and most chemicals found in soil and wastewater

Product supplied: Ocean HDPE Liner 1200 Micron

Key technical specifications

• Material: High-Density Polyethylene (HDPE)
• Thickness: 1.2 mm (1200 Micron)
• Total Area Installed: 2,500 SQM
• Tensile Strength: ≥ 27 kN/m (ASTM D6693)
• Elongation at Break: >700% (ASTM D6693)
• Puncture Resistance: >550 N (ASTM D4833)
• Permeability: <1 x 10⁻¹⁴ m/s

The high elongation is what lets the liner follow minor ground movement without rupturing, which matters for buildings on partly stabilised soil. HDPE is, however, sensitive to stress cracking where it is held under tension, so it should be laid without strain and on a smooth, even bed.

Where the liner was used

Foundation moisture barrier

The liner was installed beneath selected building blocks to stop groundwater seeping into the substructure. Moisture moving into concrete drives reinforcement corrosion and concrete decay, and the risk is higher in humid climates.

Drainage channel sealing

HDPE sheets were laid along drainage corridors so that water keeps flowing in the channels during the monsoon instead of soaking into and eroding the ground beside them.

Playground edges

Selected playground margins were protected to prevent soil washout and muddy patches after rain, keeping activity areas safer for children.

Installation

Ocean Non Wovens supplied the material and provided technical guidance on installation.

Surface preparation: the ground was graded and cleared of debris and sharp protrusions that could puncture the liner.

Seaming: panels were joined by thermal welding. All welds were tested with non-destructive air pressure testing. In a double-track wedge weld, the channel between the two tracks is sealed, pressurised and watched for pressure loss (ASTM D5820).

Edge anchoring: anchor details at the edges hold the liner in place and allow for thermal expansion and contraction over its service life.

Storage: liners were delivered in UV-protected packaging and stored in shade, in line with ASTM D4873 guidance on storage and handling of geosynthetic rolls.

What to get right on projects like this

Thickness

Budget pressure often pushes liner thickness down. Sheets thinner than 1 mm puncture more easily and are more vulnerable to stress cracking on uneven ground. The 1.2 mm liner chosen here balances cost and durability for public infrastructure.

Welding and cover placement

A liner is only as watertight as its seams and its condition once covered. Controlled welding with seam inspection, followed by careful placement of soil or concrete over the liner, prevents most of the damage that causes leaks. Ocean Non Wovens applied controlled welding with seam inspection on this project.

Drainage

A liner cannot fix waterlogging if surface and subsoil drainage are poorly designed. On this project, liner placement was planned along the natural runoff gradients.

Benefits for the school

Keeping water out of foundations and drains means:

• Fewer repair works disrupting the school year
• Lower recurring maintenance budgets
• Safer buildings
• Better hygiene around drains and toilet blocks

HDPE liners also reduce the need for chemical waterproofing compounds and help prevent soil contamination and water waste. HDPE is a recyclable thermoplastic.

Project outcome

The campus now has:

• Moisture protection at foundation level
• Durable drainage containment
• Stabilised open ground
• Long-term protection against water-related damage

Early site checks after seasonal rainfall found no seepage and the liner stable across all deployed zones.

Work with Ocean Non Wovens

Ocean Non Wovens supplies HDPE geomembranes for school campuses, reservoirs, drainage systems and foundation protection across India. See more case studies or contact the team about a project.