A Sub-Surface Drainage System is being constructed at CH. 03+700 of Sakayal-Kaipalmandu (73DR005) road and implemented under TM Piloting with proper guidence and close supervision of DTA staff. This drain system is to be built behind and below a gabion wall whose designed height is well above 5m. Sub‐soil drainage system facilitates the proper flow of water behind and below the wall which plays an important role to increase the stability of retaining wall and prevent structural failure. (See photo) The Sub-Surface Drainage construction is first of its kind for the workers of the implimenting contractor, they did the job with interest and shown the willingness to do with more confidently in future.