The publication titled "Hydrological Data (Unclassified) Book 2021" gives an overview of the hydrological data in the unclassified river basins of our country.

The present issue of the data book provides updated basin/site-wise data of river basins (Region-III) covering aspects such as location, drainage area, temperature, average runoff, seasonal water flow, historical water levels, average sediment load, water quality parameters and land use statistics.

Considering the importance of fresh reassessment of water resources availability in the country, Ministry of Water Resources, River Development and Ganga Rejuvenation (MoWR, RD & GR), Government of India had approved study for “Reassessment of Water Availability of River Basins in India using Space Inputs” for assessing the average annual wa

This comprehensive study conducted by Central Water Commission on 387 river water quality stations covering 16 river basins found that water samples at 171water quality (WQ) stations were within the permissible limit for all purposes, while 100 stations were beyond the permissible limit due to presence of two or more toxic metals. Water was considered unfit for use as per BIS standards in 92 WQ monitoring stations due to presence of Iron beyond permissible limit.

National Register of Large Dam (NRLD) is a compilation of the large dams in the country prepared as per information received from the State Government / Authority concerned. The lists of dams have been regrouped as per their location within the territory of a State. The sole purpose of the NRLD is to provide basic information about a dam to any interested party who can then approach the State Government / Authority concerned for further information. At present there are 4845 completed large dams and 347 large dams are under construction in India.

This EIA study for Siang river sub basin and Subansiri river sub basin in Brahmaputra river valley commissioned by Central Water Commission warns that the proposed 44 dams, meant to establish a capacity of 18,293 MW, will affect the river ecology and biodiversity and the region all the way down to Assam. Read full text of this report.

A flood may cause innumerable problems such as loss of agricultural produce, water logging, erosion of land, health hazards and loss of human lives. Heavy rain causes flood. Inadequate rain causes drought. In other words, flood occurred when drainage facility is not able to drain out the supply of water due to heavy rain.

This is a compilation of dams in the country prepared by the Central Water Commission as per information received from the owners of the dams.