Quick Answer
Grouted mattress is the leading canal lining system for large-scale irrigation and drainage projects because it installs without dewatering — the canal stays in operation during construction. Installed cost is typically $25–45/m² versus $60–100/m² for formed concrete. Output is 800–1,200 m² per shift using a standard concrete pump truck. GRI GT16-compliant. Design life: 50+ years with no joint maintenance.
Line a Canal Without Stopping the Flow
Traditional concrete canal lining requires dewatering — diverting or stopping flow, pumping the canal dry, forming and pouring, then waiting for cure. This takes weeks, disrupts irrigation supply, and costs as much as the concrete itself.
Grouted mattress reverses this entirely. The geotextile fabric is laid on the canal bed and slopes with flow running. Grout is pumped through injection ports, filling the fabric to the design thickness. The canal can remain in partial or full operation throughout. There is no excavation, no formwork, and no bypass pumping. For canals with artesian pore pressure or tidal influence, our filter point grouted mattress provides the same performance with engineered drainage relief. Our engineering team confirms the right variant for your site hydraulics.
What Do Completed Canal Lining Projects Look Like?
Which Canal Types Can Grouted Mattress Line?
Irrigation Canals
Main and lateral irrigation channels for large-scale agricultural water management. Installed during the off-season or with flow diverted to adjacent channels.
Water Conveyance
Long-distance water transfer schemes where seepage loss is a significant economic cost. The grouted mattress reduces loss by 90–95% versus unlined channels.
Drainage Channels
Flood drainage channels, stormwater canals, and overflow spillways where bed and bank erosion under high-velocity flow must be controlled.
Water Conservation
South-to-North Water Diversion and similar schemes where every litre of seepage loss has an economic and environmental cost.
Rehabilitation Projects
Deteriorated existing canal linings can be overlaid without removing the old surface — the geotextile conforms to the worn and irregular profile.
Cross-Section Types
Trapezoidal, rectangular, U-shaped, and parabolic canal cross-sections are all compatible — the flexible fabric adapts to any geometry.
Which Thickness Should I Specify?
Match thickness to your design flow velocity. Send site parameters and our engineers confirm the selection — free, within 48 hours.
| Thickness | Design Velocity | Typical Canal Type | Unit Weight |
|---|---|---|---|
| 50 mm | Up to 1.5 m/s | Small farm channels, low-flow laterals | 110 kg/m² |
| 75 mm | Up to 2.5 m/s | Irrigation main canals, low-gradient | 165 kg/m² |
| 100 mm | Up to 3.5 m/s | Standard irrigation and drainage canals | 220 kg/m2 |
| 150 mm | Up to 4.5 m/s | High-velocity flood channels, spillways | 330 kg/m² |
| 200 mm | Up to 6.0 m/s | Fast-flow conveyance, drop structures | 440 kg/m² |
★ Most commonly specified. All thicknesses GRI GT16-compliant, compressive strength ≥17 MPa at 28 days.
How Do You Install Grouted Mattress in a Canal?
Hydraulic Survey
Canal flow velocity, cross-section, bed material, and seepage rate measured. Mattress grade and thickness confirmed to site hydraulics.
Fabric Roll-Out
Geotextile panels unrolled along the invert first, then up both slopes. Panels overlapped 300 mm and staked. Canal can remain in partial flow.
Grout Injection
Fine-aggregate concrete pumped from one end at 15–25 m²/hr. Injection point moved at 1 m intervals. Two trucks keep the pump running continuously.
Curing & Inspection
Water misting begins within 30 minutes. Grout cube samples taken at 1 set per 50 m². Full documentation issued before next section.
How Does Grouted Mattress Compare to Formed Concrete and HDPE?
| Criterion | Grouted Mattress | Formed Concrete | HDPE Liner |
|---|---|---|---|
| Dewatering required | None | Always | Usually |
| Installation rate | 800–1,200 m²/day | 150–400 m²/day | 400–600 m²/day |
| Typical cost | $25–45/m² | $60–100/m² | $35–60/m² |
| Follows irregular profile | Conforms exactly | Requires excavation | Partial |
| Seepage control | Excellent | Excellent | Excellent |
| Design life | 50+ years | 40+ years | 20–40 years |
| Flow disruption | None needed | Full shutdown | Full shutdown |
| Maintenance | Minimal | Joint re-sealing | Puncture/UV repair |
More Canal Lining Experience Than Any Distributor
Canal Lining with Grouted Mattress: Frequently Asked Questions
Can grouted mattress be installed with water flowing in the canal?
Yes. The geotextile fabric is laid on the canal bed and banks with flow running. Grout is pumped through injection ports from above the waterline. We have installed in canals with sustained flow velocities up to 0.5 m/s — partial dewatering to slow flow may be required above this.
How does it compare on cost to conventional concrete canal lining?
Grouted mattress typically costs $25–45/m² installed versus $60–100/m² for formed and poured concrete — including the cost of avoided dewatering. The speed advantage (800–1,200 m²/shift versus 150–400 m²/shift) further reduces programme cost on time-sensitive contracts.
What canal cross-section shapes are compatible?
All standard canal profiles: trapezoidal, rectangular, U-shaped, and parabolic. The flexible fabric conforms to any geometry without cutting or forming. Curved bends and transitions are lined in a single pass.
How much does grouted mattress reduce seepage losses?
In independent trials on clay-bed canals, grouted mattress lining reduced seepage losses by 90–95% compared to unlined channels. The fine-aggregate grout fills the fabric pores and bonds to the subgrade, creating an effective hydraulic barrier.
Does the canal need to be dewatered before laying the fabric?
No dewatering is required for standard installations. The geotextile panels are positioned by crews working from the canal bank or from floating scaffolding. For steep-sided canals in deep cut, temporary stage supports may be used, but the canal is not pumped dry.
What warranty or design life does the lining carry?
Grouted mattress has a 50+ year design life with negligible maintenance requirements — no joint re-sealing, no re-grading. Our fabric carries a 10-year manufacturing defect warranty. We provide GRI GT16 test certificates and installation records for asset management purposes.
Related Applications & Products
Slope Protection
Embankments, dams, reservoirs, and highway slopes — same system, steeper angles.
Standard Grouted Mattress
Product details, thickness selection table, and GRI GT16 test data.
Technical Specifications
Full datasheet, test reports, and BOQ templates for your specification.