India

Watersheds are natural hydrological entities that cover a specific aerial expanse of land surface from which the rainfall runoff flows to a defined drain, channel, stream or river at any particular point. The terms region, basin, catchment, watershed etc are widely used to denote hydrological units.

The map shows that Tamil Nadu, Kerala, Karnataka, Goa, Maharashtra and Gujarat are high salinity zones, and Andhra Pradesh, Orissa and West Bengal are moderate salinity zones.

Click here to view the map - IRFC

Overview

In Bangalore, for example, for an annual rainfall of 900mm over 60 rainy days and a roof area of 50 sq.m.

Technical manual for Rainwater Harvesting from the Rainwater Club. It gives detailed information including required parts and approximate costs. The manual covers using rain barrels, recharge pits, directing rainwater into the sump, rainwater filters and recharge wells respectively in 5 parts.

CSE’s advanced course on “Urban Rainwater Harvesting” for working professionals, https://www.cseindia.org/aagc/rwh-professionals.asp salah@cseindia.org

The policy brief has studied the NREGA implementation on its focus on creation of productive assets, the involvement of communities in designing their local development using the NREGA and the stumbling blocks in unlocking the development potential of the Act. 

The State Groundwater Profile from the CGWB site can be viewed below. It includes a brief summary of groundwater conditions, aquifer types, average specific yield of the aquifers, types of wells dug, their specific capacity and also findings of groundwater exploration.

The School of Environmental Studies of Jadavpur University has studied the arsenic contamination for the last 19 years. Their website gives some of the details of their work -

Click here

This map gives a district level picture of the percentage of coverage of habitations having access to safe drinking water within the country. Safe drinking water availability reduces the risk of deaths due to diarrhoea, jaundice and other water borne diseases. In India still a very large proportion of people have no access to safe drinking water.

Progress towards achieving internationally agreed goals on drinking water and sanitation, shows the progress achieved over 1990-2002, of nations across the world, towards achieving safe drinking water and improved sanitation for its citizens. The map shows that India is on track in achieving its drinking water goals, but is not on track in its progress towards achieving improved sanitation.