tender for n.s. item , comprehensive maintenance and operations of all type and size of inlet channel including cost of collar joints jointed with 1:1 ½ cement sand mortar nearly dry heavily caulked into joints and with end dowels filled with 1:1½ cement sand mortar, desilting of houdies, desiling of rcc/brick channel trough rassa bori, removing of unwanted tree/grass in inlet channel alignminte, watch and ward, preventing water theft etc. including material and labour and removing of blockage if any including repair of inlet channel houdies complete in all respect. , comprehensive maintenance and repair of distribution as well as head work pipelines of all types (di/ci/ac/pvc) and all sizes at various depths, including replacment of new sluice valves, nonreturn valves, dismantling of all type paved street and restoration of same in good condition, scouring of pipes, rectification of derty water mixing water problem and disconnection of illegal/insanitary house hold connection complet