Tender For maintenance of n.g. drain free from hyacinth, patera, elephant grass, floating material grass or any other water plant and keep the surface of water in the drain clean from one end to other end by mannual / mechinacal means (by deploying weed harvester, longboom machine and motorboat etc.) to entire satisfaction of engineer-in-charge from rd. 0 m to rd. 17905 m (i.e. from dhansa regulator to chhawla bridge)