Urban water supplies are critical to the growth of the city and the wellbeing of its citizens. However, these supplies can be vulnerable to hydrological extremes, such as droughts and floods, especially if they are the main source of water for the city. Maintaining these supplies and preparing for future conditions is a crucial task for water managers, but predicting hydrological extremes is a challenge.

Order of the National Green Tribunal in the matter of Manoj Mishra Vs. Union of India & Others dated 19/03/2018 regarding drying up of the river Yamuna in Delhi due to lack of sufficient water release. NGT calls for an inspection of Reservoir/ barrage at Tajewala, Wazirabad and Okhla by the team of Members from the Irrigation Department, Union of India, Upper Yamuna River Board and Irrigation Department of State of Haryana and NCT of Delhi and Central Pollution Control Board.

Order of the Delhi High Court in the matter of S. B. Tripathi Vs GNCT of Delhi & Others dated 13/03/2018 regarding supply of water to Delhi. Delhi High Court emphasised on the importace of repairs to the water carrying canal (Delhi Sub Branch Canal) as the present condition is stated to be causing loss and wastage of precious water which is badly needed by the citizens of this city. High Court also directs for scrutiny of the supply of water which is being provided by the State of Haryana to Delhi.

With a population of 16 million, Karachi is the largest megacity in Pakistan. Despite being a large city that is home to many, it has seen a substantial decline in quality of life and economic competitiveness in recent decades.

Groundwater quality deterioration due to anthropogenic activities has become a subject of prime concern. The objective of the study was to assess the spatial and temporal variations in groundwater quality and to identify the sources in the western half of the Bengaluru city using multivariate statistical techniques. Water quality index rating was calculated for pre and post monsoon seasons to quantify overall water quality for human consumption. The post-monsoon samples show signs of poor quality in drinking purpose compared to pre-monsoon.

Order of the National Green Tribunl in the matter of Manoj Mishra Vs. Union of India & Others dated 22/02/2018 regarding high level of ammonia in the water which is reaching the water reservoir of Delhi Jal Board.

Order of the National Green Tribunal in the matter of Manoj Mishra Vs Union of India & Others dated 16/02/2018. The Application have been moved by Delhi Jal Board seeking direction of this Tribunal to the Government of Haryana to urgently take steps to check and reduce alleged dangerous level of Ammonia and consequent pollution effective on the drinking water source from upstream into river Yamuna and supply water to Wazirabad reservoir.

Urban water demand will increase by 80% by 2050, while climate change will alter the timing and distribution of water. Here we quantify the magnitude of these twin challenges to urban water security, combining a dataset of urban water sources of 482 of the world’s largest cities with estimates of future water demand, based on the Intergovernmental Panel on Climate Change (IPCC)’s Fifth Assessment scenarios, and predictions of future water availability, using the WaterGAP3 modelling framework. We project an urban surface-water deficit of 1,386–6,764 million m³.

The presence of diarrhoeagenic bacteria such as Escherichia coli in drinking water indicates faecal and sewage contamination. Testing the microbial quality of drinking water at source (n = 29) and households (n = 43) of 29 peri-urban villages of Bengaluru city, indicated that 80% and 93% of samples respectively were unfit for human consumption as per WHO standards, i.e. nil E. coli in 100 ml sample. This also indicated that water gets contaminated further at the point-of-use when compared to the source.

Order of the National Green Tribunal (Eastern Zone Bench, Kolkata) in the matter of Subhash Datta Vs Union of India & Others dated 02/11/2017 regarding solid waste management and withdrawal of sweet water in the beach area of Puri, Odisha.

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