Objective of Drainage Plan sets to find out the present functions of main and secondary drains and natural streams. Secondly, level of encroachment on drainage reservations responsible for flooding, water-logging during heavy rains. Thirdly, to find out, existing roadside drains including capacities and collected gradients. Drainage Master Plan also necessary to ensure operation and maintenance of the present facilities. For this, short and long term project improvement drainage master plan is necessary.

Drainage development for urbanization starts with drain. Drain classifies as Plot drain, Block drain, Tertiary drain, Secondary drain and Primary drain. Other natural drainage infrastructure identifies as lowland, outfall areas, khals and rivers. Man-made drains are Plot, Block, Tertiary, Secondary and Primary drains. Others known as natural drainage infrastructures. In planning for drainage network, care has given on road network in terms of conflict of drainage and waterways with roads.