Structural Drainage

Retaining Wall Drainage, Deckdrain - Eastern Peripheral Expressway, Delhi, India

Client National Highway Authority of India

Ashoka Buildcon Limited

Consultant URS Scott Wilson Pvt Ltd / AECOM- CEG JV

Deckdrain Drainage Geocomposite




– Easy to install
– Cost effective vs traditional drainage media
– Improved program time

Project Description

The 135km long upgraded Eastern Peripheral Expressway completes the ring road around Delhi, passing through 3 districts and relieving traffic congestion, especially in the Faridabad- Ghaziabad area. The project includes road widening to six lanes, flyovers, rail over-bridges, pedestrian and vehicular underpasses.


The Challenge

Providing a suitable drainage system for the many structures on the road, especially earth retaining structures subject to monsoon rain, is of paramount importance. Water must be drained away rapidly from the back of the retaining structures to avoid additional water pressure and earth pressures due to a reduction in shear strength of the soil.

Traditionally, a 600mm gravel layer or porous concrete blocks are placed behind the earth retaining structures.

The disadvantages are:

  • It is difficult to select and supply the correct filter grading to match fill material without clogging
  • Placing of stone or blocks is time consuming and damages the back of wall waterproofing layer
  • The cramped areas behind an abutment leave little room for manoeuvre with delivery or placement of both blocks or stone

The Solution

ASHOKA Buildcon obtained approval from URS Scott Wilson to install a ABG Deckdrain drainage geocomposite to avoid all of the associated difficulties and risks involved using a drainage filter stone or blocks. ABG Deckdrain met the specified flow requirements at all working temperatures, protected the structure from damage and provided a secondary waterproofing layer to the wall. Easy to install in tight working conditions, the ABG Deckdrain geocomposite is simply cut, jointed, wrapped around corners and over the base drainage pipe.

ABG Deckdrain geocomposite for vertical wall drainage

The ABG Service

ABG manufactures the only BBA approved wall drainage geocomposite for use by Highways Authorities.

Contact ABG today to discuss your project specific requirements and discover how ABG past experience and innovative products can help.


Additional information