Pre-fabricated geocomposite drain for use as a combined drainage and protection layer

Product Description

HYDRODUCT® TUNNEL DRAIN is a strong, preformed 0.6 in. (16 mm) thick geocomposite drainage sheet, comprising a polypropylene drainage core of fused, entangled monofilaments with a specialized nonwoven geotextile bonded to one side. Both the core and the geotextile contain effective fire retardants.


HYDRODUCT® TUNNEL DRAIN has been specially designed to provide a simple and highly practical collector and deflector of unwanted ground water in tunnel applications. It can be used with Preprufe and Preprufe SCS Waterproofing Systems.When installed it protects the membrane from damage and minimizes the build-up of percolated surface water against the structure. The construction of the drainage core also creates an air void to isolate the structure from the effects of the surrounding ground.

HYDRODUCT® TUNNEL DRAIN has been designed to withstand ground pressures and the compaction forces of wet concrete to maintain a high water flow capacity. The drainage sheet must be connected into the tunnel’s drainage discharge system to eliminate hydrostatic build-up.

Product Advantages

  • Enhances waterproofing—eliminates hydrostatic pressure build-up
  • Efficient water collector/deflector—can be used as a sandwich drainage layer between soil retention system and the reinforced concrete structure 
  • Simple convenient drainage and protection layer—serves as robust membrane protection and drainage
  • Geotextile fabric filter—provides a protection layer for waterproofing membrane
  • High flow capacity—drains 18 gals/min./ft (225 L/min./m) width under 5000psf pressure
  • Rot proof—unaffected by permanent immersion in water, bacteria, dilute acids and alkalis
  • Economical—eliminates imported aggregate drainage layers

Application Procedures

Safety, Storage and Handling Information

All construction products must be handled properly. Safety Data Sheets (SDS) are available at gcpat.com and users should acquaint themselves with this information. Carefully read detailed precaution statements on product labels and the SDS before use.


HYDRODUCT® TUNNEL DRAIN is installed by a GCP approved waterproofing applicator. GCP provides designers and engineers with a customized solution for the most complex waterproofing challenges.


Core Width 39.0 in.  99.1 cm
Length 150.0 ft 45.7 m
Area 54.2 yd2 45.3 m2
Area 487.5 ft2 45.3 m2
Roll Diameter 44.0 in.  1.1 m
Gross Roll Weight 100 lbs.  45.4 kg

Typical Properties

Core Material Polypropylene  
Thickness 0.6 in. 16 mm
Total Weight 29.5 oz/yd2 1000 g/m2
Core Weight 24.0 oz/yd2 813.8 g/m2
Compressive Load Test 1 >30,000 psf kN/m2 No Failure*

Typical Flow Rates

250 psf 21.0 gal/min/ft 14.5 gal/min/ft 9.6 gal/min/ft
500 psf 21.0 gal/min/ft 13.8 gal/min/ft 8.2 gal/min/ft
1000 psf 19.7 gal/min/ft 13.0 gal/min/ft 8.0 gal/min/ft
3000 psf 18.9 gal/min/ft 13.2 gal/min/ft 7.7 gal/min/ft
5000 psf 18.1 gal/min/ft 12.2 gal/min/ft 7.5 gal/min/ft

1Test method: ASTM 1621 D modified and ASTM D 4716
*Failure defined as reaching yield point or no continued measurable flow under stated load.
**Custom widths and lengths available in 2011, consult your GCP representative. 

gcpat.com | North America Customer Service: 1 877-4AD-MIX1 (1 877-423-6491)

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

HYDRODUCT is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

© Copyright 2018 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 62 Whittemore Avenue, Cambridge, MA 02140 USA.

In Canada, 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.

This document is only current as of the last updated date stated below and is valid only for use in the United States. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.com. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2020-01-16