Surface by trench anchoring method. In this method a trench is constructed around the reservoir and Liner is anchored in this trench by back filling the trench as shown in the above drawing. The Liner is available in 2 meter width and 30 meter length as standard panel. The above Panels are joined with the help of thermo welding machine to make the desired panel width. The welding is very strong and of good finish with 100% Seepage proof.