A Review on Restoration of Nag River in Nagpur Region

Nagpur is a city in the central part of India in Maharashtra State. Nagpur district is located between 21°45' N to 20°30' N and 78°15' E to 79°45' E. The adjoining districts are Bhandara on the east, Chandrapur on the south, Amravati and Wardha on the west and in the north shares the boundary with Madhya Pradesh. The Nagpur district is located in the Deccan Plateau region of Maharashtra. The city is practically located at the geographical centre of India. In fact the zero milestone of India is in this city. Bakth Buland Shah, the founder of Nagpur city, decided to start the settlement along the river in early 18th century. The expansion took place on both sides of the Nag River. Nag River flows through the city Nagpur which covers 50 km length of city. The name of Nagpur city has been derived from Nag River, which is also known as Orange city for being major trade centre of oranges. Nag River originates from Ambazari Lake which is situated at upstream of Nagpur city. Nag River ecosystem is subjected to human interference and anthropogenic activites like discharge of untreated sewage and industrial effluents of 420 MLD of capacity flows through the river and makes it dark gray in colour and emanates foul smell during non-monsoon period. The length of Nag River around city boundary is 17 kms and this river basin is called as central zone. It is located at west part of city and it flows into Kanhan River and from there it is confluenced with Gosikhurd Project situated at village Gose Tah. Pauni Dist. Bhandara. The untreated sewage is either percolating to ground or routing to natural water bodies. Holistic planning for Sewerage infrastructure requires survey and investigation, population projections, estimated sewage generation, existing infrastructure and obstruction features. The preparation for proposed sewerage infrastructure improvements includes analysis of attributed information to develop optimized designs. This includes selection of suitable materials of construction, techniques for implementation of new components and rehabilitation/augmentation of existing infrastructure along with efficient operation and maintenance. The concerned executing agency of Nagpur, Nagpur Municipal Corporation (NMC) has taken various initiatives including preparation of a Sewerage Master Plan for river. sewerage infrastructure development must include sewerage connectivity to all households, rejuvenation of natural drains, rejuvenation of rivers and alternative source of non-potable water to attain improved hygiene, better standard of living and low mortality rates. Nagpur Municipal Cooperation (MNC) is responsible for providing potable water and sewerage facilities. NMC has taken remarkable initiatives with key approach towards structuring and development of Nagpur's rivers sewerage infrastructure. The purpose of this thesis is to present a Green bridges are an Eco technological in-situ bio remediation system. Their different physical and biological filters work in combination to remove suspended and dissolved impurities of water. Green bridge filters help in reducing the suspended solids by filtration process, reducing Chemical Oxygen Demand (COD)/Biochemical Oxygen Demand (BOD) by aerobic degradation. Green Bridges also help in the restoration of ecological food chain